The University of Southampton
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Physics and Astronomy
Telephone:
+442380599620
Email:
V.Apostolopoulos@soton.ac.uk

Dr Vasileios Apostolopoulos 

I am a researcher that works on development of lasers, 2D materials, Terahertz spectroscopy and photonics system for quantum physics applications.

I work in Physics and Astronomy in the University of Southampton from September 2007 where I lead the TeraHertz laboratories group and the Ultrafast lasers group. I am at the level of a tenured Associate professor and I am the head of the graduate school in Physics and Astronomy. I was at the steering committee of the TeraNet network which is a group of UK scientists that are given the task from EPSRC to strengthen TeraHertz research and form a roadmap of TeraHertz activities in the UK. I am part of the Quantum Hub on Sensors and now we are poised for the 2nd stage of the Quantum Hubs in the UK to start during 2020.

We have demonstrated a 60 fs semiconductor ultrafast laser {Nature Photonics 3, 729-731, 2009}; world’s first all semiconductor THz spectrometer {Opt Lett, 33, p. 2125, 2008}; the first THz surface emitting photonic crystal quantum cascade laser {Appl Phys Lett, 93, 171112, 2008}; a novel type of THz emitter {Appl Phys Lett, 103, 252101, 2013}; a tunable repetition rate semiconductor ultrafast laser {Appl. Phys. Lett. 113, 161106, 2018}. I was invited in 2018 SPIE Photonics West to present our work on VECSEL-based THz spectrometers. We work on 2D materials, specifically on non-volatile, re-writable optical control of graphene conductivity using photo-conductive insulators {ACS Nano. https://doi.org/10.1021/acsnano.8b02161}. Finally we work on components for THz wavefront and waveform control based on meta-materials and liquid crystals {Opt. Mater. Express 8, 420-430, 2018; J. of Infr, Mill, and Terahertz Waves, 39, 223–235, 2018}.

http://www.thz.soton.ac.uk

http://vecsel.soton.ac.uk 

http://www.thz-tds.co.uk

Publications

Busacca, A.C., Sones, C.L., Apostolopoulos, V., Eason, R.W. and Mailis, S. (2002) Surface domain engineering in congruent lithium niobate single crystals: a route to sub-micron periodic poling. Applied Physics Letters, 81 (26), 4946-4948. (doi:10.1063/1.1532773).

Sones, C.L., Mailis, Sakellaris, Apostolopoulos, V., Barry, I.E., Gawith, C.B.E., Smith, Peter G.R. and Eason, R.W. (2002) Fabrication of piezoelectric micro-cantilevers in domain-engineered LiNbO3 single crystals. Journal of Micromechanics and Microengineering, 12 (1), 53-57. (doi:10.1088/0960-1317/12/1/308).

Favre, A., Lee, E.T.Y., Apostolopoulos, V., Gawith, C.B.E., Tai, C.Y., Taylor, E.R.M., Kondo, Y. and Koizumi, F. (2004) UV-written channel waveguides in Er3+-doped Bi2O3-based glass. [in special issue: E-MRS 2003 Fall Meeting: Symposia A anc C] Physica Status Solidi (c), 1 (2), 295-298. (doi:10.1002/pssc.200303919).

Hickey, Louise M.B., Apostolopoulos, Vasilis, Eason, Robert W., Wilkinson, James S. and Anderson, Andrew A. (2004) Diffused Ti:sapphire channel-waveguide lasers. Journal of the Optical Society of America B, 21 (8), 1452-1462. (doi:10.1364/JOSAB.21.001452).

Sones, C.L., Busacca, A.C., Apostolopoulos, V., Eason, R.W. and Mailis, S. (2002) Surface periodic poling of lithium niobate for efficient non-linear optical waveguide applications. Photonics 2002, Mumbai, India. 16 - 18 Dec 2002.

Busacca, A.C., Apostolopoulos, V., Eason, R.W. and Mailis, S. (2002) Surface engineered ferroelectric domains in congruent lithium niobate crystals. CLEO 2002: Conference on Lasers and Electro-Optics, , Long Beach, United States. 19 - 24 May 2002. 2 pp .

Wilkinson, J.S., Apostolopoulos, V. and Hickey, L.M.B. (2001) Sapphire waveguide lasers. Integrated Photonics Research 2001, Monterey, United States. 12 - 14 Jun 2001.

Favre, A., Lee, Eric, Apostolopoulos, V., Gawith, C.B.E., Tai, C.Y., Taylor, E.M., Kondon, Y. and Koizumi, F. (2003) Fabrication and characterization of planar and channel waveguides in bismuth-based oxide glasses. SPIE 4990 Photonics West 2003, San Jose, United States. 25 - 31 Jan 2003. 8 pp . (doi:10.1117/12.474770).

Apostolopoulos, Vasilis (2003) Gallium and titanium diffused optical waveguide devices in sapphire. University of Southampton, Optoelectronic Research Center, Doctoral Thesis, 181pp.

Apostolopoulos, V., Laversenne, L., Colomb, T., Depeursinge, C., Salathé, R.P., Pollnau, M., Osellame, R., Cerullo, G. and Laporta, P. (2004) Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire. Applied Physics Letters, 85 (7), 1122-1124. (doi:10.1063/1.1781737).

Romanyuk, Y.E., Utke, I., Ehrentraut, D., Apostolopoulos, V., Pollnau, M., García-Revilla, S. and Valiente, R. (2004) Low-temperature liquid-phase epitaxy and optical waveguiding of rare-earth-ion-doped KY(WO4)2 thin layers. Journal of Crystal Growth, 269 (2-4), 377-384. (doi:10.1016/j.jcrysgro.2004.05.049).

Apostolopoulos, V., Hickey, L.M.B., Sager, D.A. and Wilkinson, J.S. (2006) Diffusion of gallium in sapphire. Journal of the European Ceramic Society, 26 (13), 2695-2698. (doi:10.1016/j.jeurceramsoc.2005.06.039).

Borca, C.N., Apostolopoulos, V., Gardillou, F., Limberger, H.G., Pollnau, M. and Salathé, R.-P. (2007) Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation. [in special issue: Photon-Assisted Synthesis and Processing of Functional Materials — E-MRS-H Symposium] Applied Surface Science, 253 (19), 8300-8303. (doi:10.1016/j.apsusc.2007.02.106).

Favre, Angélique, Lee, Eric, Apostolopoulos, Vasilis, Gawith, Corin B.E., Tai, Chao-Yi, Taylor, Elizabeth R., Kondo, Yuki and Koizumi, Fumihito (2004) Fabrication and characterization of UV-written channel waveguides in Bi2O3-based glass. Optical Materials, 27 (1), 7-13. (doi:10.1016/j.optmat.2004.01.009).

Freeman, J.R., Worrall, C., Apostolopoulos, V., Alton, J., Beere, H. and Ritchie, D.A. (2008) Frequency manipulation of THz bound-to-continuum quantum-cascade lasers. IEEE Photonics Technology Letters, 20 (4), 303-305. (doi:10.1109/lpt.2007.913340).

Husband, B., Bu, M., Apostolopoulos, V., Melvin, T. and Evans, A.G.R. (2004) Novel actuation of an integrated peristaltic micropump. Microelectronic Engineering, 73-74, 858-863. (doi:10.1016/j.mee.2004.03.065).

Sager, D.A., Apostolopoulos, V. and Wilkinson, J.S. (2002) Diffusion of neodymium into sputtered films of tantalum pentoxide. Journal of the American Ceramic Society, 85 (10), 2581-2583. (doi:10.1111/j.1151-2916.2002.tb00501.x).

Husband, B., Bu, M., Apostolopoulos, V., Melvin, T. and Evans, A.G.R. (2003) Investigation for the operation of an integrated peristaltic micropump. 14th Micromechanics Europe Workshop, Delft, The, Netherlands. 02 - 04 Nov 2003.

Mihoubi, Zakaria, Wilcox, Keith G., Elsmere, Stephen, Quarterman, Adrian, Rungsawang, Rakchanok, Farrer, Ian, Beere, Harvey E., Ritchie, David A., Tropper, Anne and Apostolopoulos, Vasileios (2008) All-semiconductor room-temperature terahertz time domain spectrometer. Optics Letters, 33 (18), 2125-2127. (doi:10.1364/OL.33.002125).

Marshall, Owen P., Apostolopoulos, Vasilieios, Freeman, Joshua R., Rungsawang, Rakchanok, Beere, Harvey E. and Ritchie, David A. (2008) Surface-emitting photonic crystal terahertz quantum cascade lasers. Applied Physics Letters, 93 (17), 171112-[3pp]. (doi:10.1063/1.3012385).

Quarterman, Adrian H., Wilcox, Keith G., Apostolopoulos, Vasilis, Mihoubi, Zakaria, Elsmere, Stephen P., Farrer, Ian, Ritchie, David A. and Tropper, Anne (2009) A passively mode-locked external-cavity semiconductor laser emitting 60-fs pulses. Nature Photonics, 3 (10), 729-731. (doi:10.1038/NPHOTON.2009.216).

Hoffmann, Patrik, Utke, Ivo, Perentes, Alexandre, Bret, Tristan, Santschi, Christian and Apostolopoulos, Vasileios (2005) Comparison of fabrication methods of sub-100nm nano-optical structures and devices. In, Gaburro, Zeno and Cabrini, Stefano (eds.) Nanocrystal Synthesis I. (Proceedings of SPIE, 5925) Bellingham, US. Society of Photo-Optical Instrumentation Engineers, p. 592506. (doi:10.1117/12.617142).

Quarterman, A.H., Perevedentsev, A., Wilcox, K.G., Apostolopoulos, V., Beere, H.E., Farrer, I., Ritchie, D.A. and Tropper, A.C. (2010) Passively harmonically mode-locked vertical-external-cavity surface-emitting laser emitting 1.1 ps pulses at 147 GHz repetition rate. Applied Physics Letters, 97 (25), 251101-[3pp]. (doi:10.1063/1.3527973).

Barnes, M.E., Mihoubi, Z., Wilcox, K.G., Quarterman, A.H., Farrer, I., Ritchie, D.A., Garnache, A., Hoogland, S., Apostolopoulos, V. and Tropper, A.C. (2010) Gain bandwidth characterization of surface-emitting quantum well laser gain structures for femtosecond operation. Optics Express, 18 (20), 21330-21341. (doi:10.1364/OE.18.021330). (PMID:20941029)

Kaur, K.S., Subramanian, A.Z., Ying, Y.J., Banks, D.P., Feinäugle, M., Horak, P., Apostolopoulos, V., Sones, C.L., Mailis, S. and Eason, R.W. (2011) Waveguide mode filters fabricated using laser-induced forward transfer. Optics Express, 19 (10), 9814-9819. (doi:10.1364/OE.19.009814).

Apostolopoulos, V., Hickey, L.M.B., Sager, D.A. and Wilkinson, J.S. (2001) Gallium-diffused waveguides in sapphire. Optics Letters, 26 (20), 1586-1588. (doi:10.1364/OL.26.001586).

Apostolopoulos, V., Hickey, L.M.B. and Wilkinson, J.S. (2001) Gallium-diffused waveguides in sapphire. ECIO, Paderborn, Germany. 03 - 05 Apr 2001.

Apostolopoulos, V., Sager, D.A., Wilkinson, J.S. and Hickey, L.M.B. (2002) Gallium-diffused ridge waveguides in sapphire. Conference on Lasers and Electro-Optics CLEO 2002, Long Beach, United States. 18 - 23 May 2002. 3 pp . (doi:10.1109/CLEO.2002.1033910).

Quarterman, A.H., Carswell, S., Daniell, G.J., Mihoubi, Z., Wilcox, K.G., Chung, A.L., Apostolopoulos, V. and Tropper, A.C. (2011) Numerical simulation of optical Stark effect saturable absorbers in mode-locked femtosecond VECSELs using a modified two-level atom model. Optics Express, 19 (27), 26783-26795. (doi:10.1364/OE.19.026783). (PMID:22274261)

Wilcox, Keith G., Quarterman, Adrian H., Apostolopoulos, Vasilis, Beere, Harvey E., Farrer, Ian, Ritchie, David A. and Tropper, Anne C. (2012) 175 GHz, 400-fs-pulse harmonically mode-locked surface emitting semiconductor laser. Optics Express, 20 (7), 7040-7045. (doi:10.1364/OE.20.007040). (PMID:22453384)

Barnes, M.E., McBryde, D., Daniell, G.J., Whitworth, G., Chung, A.L., Quarterman, A.H., Wilcox, K.G., Brewer, A., Beere, H.E., Ritchie, D.A. and Apostolopoulos, V. (2012) Terahertz emission by diffusion of carriers and metal-mask dipole inhibition of radiation. Optics Express, 20 (8), 8898-8906. (doi:10.1364/OE.20.008898).

Barnes, M.E., Berry, S.A., Gow, P., McBryde, D., Daniell, G.J., Beere, H.E., Ritchie, D.A. and Apostolopoulos, V. (2013) Investigation of the role of the lateral photo-Dember effect in the generation of terahertz radiation using a metallic mask on a semiconductor. Optics Express, 21 (14), 16263-16272. (doi:10.1364/OE.21.016263). (PMID:23938477)

Aghajani, A., Murugan, G.S., Sessions, N.P., Apostolopoulos, V. and Wilkinson, J.S. (2013) Ytterbium-doped tantalum pentoxide waveguides: spectroscopy for compact waveguide lasers. Advanced Solid State Lasers (ASSL), Paris, France. 26 Oct - 01 Nov 2013. (doi:10.1364/ASSL.2013.AM4A.38).

McBryde, D., Gow, P., Berry, S.A., Barnes, M.E., Aghajani, A. and Apostolopoulos, V. (2014) Multiple double-metal bias-free terahertz emitters. Applied Physics Letters, 104 (20), [201108]. (doi:10.1063/1.4878739).

Aghajani, A., Murugan, G.S., Sessions, N.P., Pearce, S.J., Apostolopoulos, V. and Wilkinson, J.S. (2014) Spectroscopy of ytterbium-doped tantalum pentoxide rib waveguides on silicon. Optical Materials Express, 4 (8), 1505-1514. (doi:10.1364/OME.4.001505).

Aghajani, Armen, Wilkinson, James S., Murugan, G.S., Apostolopoulos, Vasilis and Sessions, Neil (2014) Spectroscopy of high index contrast Yb:Ta2O5 waveguides for lasing applications. ICOOPMA '14: Sixth International Conference on Optical, Optoelectronic and Photonic Materials and Applications, Leeds, Leeds, United Kingdom. 26 Jul - 30 Aug 2014.

Aghajani, A., Murugan, G.S., Sessions, N.P., Apostolopoulos, V. and Wilkinson, James S. (2014) Ytterbium-doped tantalum pentoxide waveguide lasers. ECIO-MOC: European Conference on Integrated Optics and Microoptics Conference, , Nice, France. 24 - 27 Jun 2014. 2 pp .

McBryde, D., Barnes, M.E., Berry, S.A., Gow, P., Beere, H.E., Ritchie, D.A. and Apostolopoulos, V. (2014) Fluence and polarisation dependence of GaAs based Lateral Photo-Dember terahertz emitters. Optics Express, 22 (3), 3234-3243. (doi:10.1364/OE.22.003234).

Aghajani, Armen, Murugan, Ganapathy S., Sessions, Neil, Apostolopoulos, Vasileios and Wilkinson, James (2015) Waveguide lasers in ytterbium-doped tantalum pentoxide on silicon. University of Southampton doi:10.5258/SOTON/376707 [Dataset]

Aghajani, A., Murugan, G.S., Sessions, N.P., Apostolopoulos, V. and Wilkinson, J.S. (2015) Waveguide lasers in ytterbium-doped tantalum pentoxide on silicon. Optics Letters, 40 (11), 2549-2552. (doi:10.1364/OL.40.002549).

Aghajani, A., Murugan, G.S., Sessions, N.P., Apostolopoulos, V. and Wilkinson, J.S. (2015) CMOS-compatible high index contrast ytterbium-doped tantalum pentoxide rib waveguide lasers. European Conference on Lasers and Electro-Optics (CLEO Europe), Munich, Germany. 20 - 24 Jun 2015. 1 pp .

Mavrona, Eleni, Chodorow, U., Barnes, Mark, Parka, Janusz, Palka, N., Saitzek, S., Blach, Jean-François and Apostolopoulos, Vasileios (2015) Refractive indices and birefringence of hybrid liquid crystal - nanoparticles composite materials in the terahertz region. University of Southampton doi:10.5258/SOTON/380718 [Dataset]

Maple, L.C., Berry, S.A., Stenning, G.B.G., Bowden, G.J., de Groot, P.A.J. and Apostolopoulos, V. (2015) A metamolecule antenna for coplanar waveguides. Optics Express, 22 (25), 30473-30481. (doi:10.1364/OE.22.030473).

Gow, P.C., McBryde, D., Berry, S.A., Barnes, M. E. and Apostolopoulos, V. (2014) Characterisation of THz emission from double-metal-patterned gallium-arsenide multiple emitters. Electronics Letters, 50 (25), 1966-1967. (doi:10.1049/el.2014.2751).

Barnes, Mark E., McBryde, Duncan, Gow, Paul C., Berry, Sam A., Daniell, Geoff J., Beere, Harvey E., Ritchie, David A. and Apostolopoulos, Vasilis (2013) Investigation into the role of the metal mask and pump laser illumination parameters for lateral photo-Dember emitters. In 2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE.. (doi:10.1109/IRMMW-THz.2013.6665608).

McBryde, Duncan, Barnes, Mark E., Gow, Paul C., Berry, Sam A., Daniell, Geoff J., Beere, Harvey E., Ritchie, David A. and Apostolopoulos, Vasilis (2013) Characterisation of low temperature and semi-insulating GaAs lateral photo-Dember THz emitters. In 2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE. 2 pp . (doi:10.1109/IRMMW-THz.2013.6665658).

Barnes, Mark E., McBryde, Duncan, Berry, Sam A., Gow, Paul C., Daniell, Geoff J., Beere, Harvey E., Ritchie, David A. and Apostolopoulos, Vasilis (2013) Terahertz emission from lateral surge currents and suppression of dipoles under a metal mask. In 2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE.. (doi:10.1109/IRMMW-THz.2013.6665434).

Barnes, Mark E., Daniell, Geoff J., Gow, Paul and Apostolopoulos, Vasilis (2014) Simulation of terahertz generation from lateral diffusion currents in semiconductor devices. JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, 35 (12), 1030-1044. (doi:10.1007/s10762-014-0111-y).

Gow, P., Berry, S.A., McBryde, D., Barnes, M. E., Beere, H. E., Ritchie, D. A. and Apostolopoulos, V. (2013) Multiple lateral photo-Dember terahertz emitters illuminated by a cylindrical micro-lens array. Applied Physics Letters, 103 (25), [252101]. (doi:10.1063/1.4850576).

Chen-Sverre, Theo, Turnbull, Andrew, Gow, Paul C., Mavrona, Eleni, Head, Christopher R., Apostolopoulos, Vasileios and Tropper, Anne (2017) Mode-locked VECSEL SESAM with intracavity antenna for Terahertz emission. Jetter, Michael (ed.) In Vertical External Cavity Surface Emitting Lasers (VECSELs) VII. vol. 10087, SPIE.. (doi:10.1117/12.2252346).

Gow, P.C., McBryde, D., Berry, Sam, Barnes, M.E. and Apostolopoulos, V. (2015) Double-metal Schottky enhanced THz emitters. In European Conference on Lasers and Electro-Optics, CLEO 2015. OSA..

Chodorow, U., Mavrona, E., Chojnowska, O., Garbat, K., Walczakowski, M., Saizek, S., Blach, J. F., Apostolopoulos, V., Kaczmarek, M. and Parka, J. (2014) Terahertz properties of liquid crystals doped with ferroelectric BaTiO3 nanoparticles prepared by the sol-gel process. In European Conference on Lasers and Electro-Optics, CLEO 2015. OSA..

Kurochkin, Oleksandr, Mavrona, Elena, Apostolopoulos, Vasilis, Blach, Jean François, Henninot, Jean François, Kaczmarek, Malgosia, Saitzek, Sébastien, Sokolova, Marina and Reznikov, Yu (2015) Electrically charged dispersions of ferroelectric nanoparticles. Applied Physics Letters, 106 (4), 1-4, [043111]. (doi:10.1063/1.4907224).

Mavrona, E., Chodorow, U., Barnes, M. E., Parka, J., Palka, N., Saitzek, S., Blach, J. F., Apostolopoulos, V. and Kaczmarek, M. (2015) Refractive indices and birefringence of hybrid liquid crystal - nanoparticles composite materials in the terahertz region. AIP Advances, 5 (7), [077143]. (doi:10.1063/1.4927392).

Apostolopoulos, V and Barnes, M E (2014) THz emitters based on the photo-Dember effect. Journal of Physics D: Applied Physics, 47 (37), 1-16, [374002]. (doi:10.1088/0022-3727/47/37/374002).

Maple, Lewis, Charles, Gow, Paul and Apostolopoulos, Vasileios (2017) Simulation of THz generation and propagation from photo-Dember emitters. 2017 42nd International Conference on Infrared, Millimeter and Terahertz Waves. (doi:10.1109/IRMMW-THz.2017.8067181).

Carthy, Joanna, Leigh, Gow, Paul, Berry, Sam, Mills, Benjamin and Apostolopoulos, Vasileios (2017) THz focusing in large-area bias-free semiconductor emitters. 2017 42nd International Conference on Infrared, Millimeter and Terahertz Waves. (In Press) (doi:10.1109/IRMMW-THz.2017.8066972).

Gow, Paul C., Carthy, Joanna, Leigh, Berry, Sam and Apostolopoulos, Vasileios (2017) A radial double-metal bias-free THz emitter for coaxial cable transmission. 2017 42nd International Conference on Infrared, Millimeter and Terahertz Waves. (In Press) (doi:10.1109/IRMMW-THz.2017.8067233).

Apostolopoulos, Vasilis, Daniell, Geoff and Chung, Aaron (2012) Complex refractive index determination using planar and converging beam transfer functions. In, K.E., Peiponen, J.A., Zeitler and M., Kuwata-Gonokami (eds.) Springer Series in Optical Sciences. (Springer Series in Optical Sciences, 171) Berlin; Heidelberg. Springer, pp. 81-94. (doi:10.1007/978-3-642-29564-5_4#page-1).

Chung, Aaron L., Barnes, Mark E., Berry, Sam, McBryde, Duncan, Daniell, Geoff J., Zeitler, Axel and Apostolopoulos, Vasileios (2013) Angular profile determination of a THz-Time Domain Spectrometer. 2013 38th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THZ).

Chodorow, U., Mavrona, E., Palka, N., Strzezysz, O., Garbat, K., Saitzek, S., Blach, J. F., Apostolopoulos, V., Kaczmarek, M. and Parka, J. (2016) Terahertz properties of liquid crystals doped with ferroelectric BaTiO³ nanoparticles. Liquid Crystals, 1-9. (doi:10.1080/02678292.2016.1271468).

Podoliak, Nina, Mavrona, Eleni, Mailis, Sakellaris, Gill, Jordan, Ronald Ewan, D'alessandro, Giampaolo, Apostolopoulos, Vasileios, Tabiryan, Nelson and Kaczmarek, Malgosia (2017) Intrinsic and photo-induced optical properties of photoaligning azo-based materials coupled with liquid crystal systems. In Proceedings Volume 10361, Liquid Crystals XXI. SPIE.. (doi:10.1117/12.2273928).

Gorecki, Jonathan, Papasimakis, Nikitas, Mailis, Sakellaris and Apostolopoulos, Vasileios (2017) Light controlled conductivity of graphene on photorefractive lithium niobate. Nanophotonics and Micro/Nano Optics International Conference 2017, , Barcelona, Spain. 13 - 15 Sep 2017.

Apostolopoulos, Vasileios (2018) Dataset for Terahertz focusing and polarization control in large-area bias-free semiconductor emitters. Springer doi:10.5258/SOTON/D0289 [Dataset]

Carthy, Joanna L., Gow, Paul C., Berry, Sam A., Mills, Ben and Apostolopoulos, Vasilis (2018) Terahertz focusing and polarization control in large-area bias-free semiconductor emitters. Journal of Infrared, Millimeter, and Terahertz Waves, 39 (3), 223–235. (doi:10.1007/s10762-017-0452-4).

Perivolari, Eleni, Gill, Jordan, Ronald Ewan, Apostolopoulos, Vasileios, Sluckin, T.J., D'alessandro, Giampaolo and Kaczmarek, Malgosia (2017) Optically controlled bistable waveplates. Journal of Molecular Liquids. (doi:10.1016/j.molliq.2017.12.119).

Mavrona, E., Mailis, S., Podoliak, N., D'Alessandro, G., Tabiryan, N., Trapatseli, M., Blach, J. F., Kaczmarek, M. and Apostolopoulos, V. (2018) Intrinsic and photo-induced properties of high refractive index azobenzene based thin films [Invited]. Optical Materials Express, 8 (2), 420-430. (doi:10.1364/OME.8.000420).

Mailis, Sakellaris, Podoliak, Nina, D'alessandro, Giampaolo, Trapatseli, Maria and Blach, Jean-François (2018) Intrinsic and photo-induced properties of high refractive index azobenzene based thin films. Optical Society of America doi:10.5258/SOTON/D0364 [Dataset]

Gow, Paul (2018) Dataset for Temperature dependent polarity inversion in double-metal terahertz emitters. University of Southampton doi:10.5258/SOTON/D0447 [Dataset]

Apostolopoulos, Vasilis, Tropper, Anne C., Keenlyside, Benjamin, Chen-Sverre, Theo and Woods, Jonathan R.C. (2018) New developments in THz-time domain spectroscopy involving ML-VECSELs. In Vertical External Cavity Surface Emitting Lasers (VECSELs) VIII. vol. 10515, SPIE.. (doi:10.1117/12.2289917).

Chen-Sverre, T., Woods, J.R.C., Shaw, E.A., Hua, Ping, Apostolopoulos, V., Wilkinson, J.S. and Tropper, A.C. (2018) Tantalum pentoxide waveguides and microresonators for VECSEL based frequency combs. In Vertical External Cavity Surface Emitting Lasers (VECSELs) VIII. vol. 10515, SPIE. pp. 1-10 . (doi:10.1117/12.2289773).

Van Putten, L.D., Gorecki, J., Numkam Fokoua, E., Apostolopoulos, V. and Poletti, F. (2018) 3D-printed polymer antiresonant waveguides for short-reach terahertz applications. Applied Optics, 57 (14), 3953-3958. (doi:10.1364/AO.57.003953).

Gorecki, Jonathan, Apostolopoulos, Vasileios, Ou, Jun-Yu, Mailis, Sakellaris and Papasimakis, Nikitas (2018) Optical gating of graphene on photoconductive Fe:LiNbO3. ACS Nano, 12 (6), 5940-5945, [12]. (doi:10.1021/acsnano.8b02161).

Maple, Lewis, Gow, P.C. and Apostolopoulos, Vasilis (2018) Simulation of THz generation and propagation from photo-Dember emitters. Journal of the Optical Society of America B: Optical Physics, 35 (7), 1552-1556. (doi:10.1364/JOSAB.35.001552).

Gow, P.C., McBryde, D., Berry, S.A. and Apostolopoulos, V. (2018) Temperature dependent polarity inversion in double-metal terahertz emitters. Electronics Letters, 54 (16), 991-993. (doi:10.1049/el.2018.0961).

Chen Sverre, Theo, Woods, Jonathan, Polanik, Markus, Unger, Peter, Tropper, Anne and Apostolopoulos, Vasileios (2018) Dataset for Continuous Repetition Rate Tuning from 960 MHz to 1.72 GHz of a sub-300 femtosecond Mode-Locked Semiconductor Disk Laser. University of Southampton doi:10.5258/SOTON/D0571 [Dataset]

Chen-Sverre, T., Woods, J. R.C., Polanik, M., Unger, P., Tropper, A. C. and Apostolopoulos, V. (2018) Continuous repetition rate tuning from 960 MHz to 1.72 GHz of a sub-300 femtosecond mode-locked semiconductor disk laser. Applied Physics Letters, 113 (16), [161106]. (doi:10.1063/1.5045650).

Gorecki, Jonathan (2019) Dataset for Optical Gating of Graphene on Photoconductive Fe:LiNbO3. University of Southampton doi:10.5258/SOTON/D0521 [Dataset]

Gorecki, Jonathan, Piper, Lewis, Kieran, Mailis, Sakellaris, Apostolopoulos, Vasileios and Papasimakis, Nikitas (2019) Optical tuning of graphene electronics and plasmonics on iron doped lithium niobate. 2019 Conference on Lasers and Electro-Optics, CLEO 2019, San Jose Convention Center, San Jose, United States. 05 - 10 May 2019. (doi:10.1364/CLEO_SI.2019.STh4H.6).

Robin Head, C., Chen-Sverre, T., Woods, Jonathan, Hein, Alexander, Polanik, Markus, Turnbull, Andrew P., Shaw, Edward A., Unger, Peter, Tropper, Anne C. and Apostolopoulos, Vasilis (2019) Study of dielectric coatings for broadband operation of surface-emitting semiconductor lasers. Journal of the Optical Society of America B: Optical Physics, 36 (3), 752-756. (doi:10.1364/JOSAB.36.000752).

Gorecki, Jonathan, Mailis, Sakellaris, Apostolopoulos, Vasileios and Papasimakis, Nikitas (2018) Optical gating of graphene. Graphene Week 2018, , San Sebastian, Spain. 10 - 14 Sep 2018.

Woods, Jonathan, Heath, Daniel, Daykin, Jake, Chen sverre, Theo, Mills, Benjamin, Garnache, Arnaud, Tropper, Anne and Apostolopoulos, Vasileios (2019) Dataset for "Towards dual frequency comb VECSELs with DMD laser-ablated spatial mode masks". University of Southampton doi:10.5258/SOTON/D0845 [Dataset]

Woods, Jonathan, Heath, Daniel, Daykin, Jake, Chen-Sverre, Theo, Mills, Benjamin, Sagnes, Isabelle, Garnache, Arnaud, Tropper, Anne and Apostolopoulos, Vasileios (2019) Towards dual frequency comb VECSELs with DMD laser-ablated spatial mode masks. SPIE Photonics West, Moscone Center, San Fransisco, United States. 01 - 06 Feb 2019. (doi:10.1117/12.2508680).

Woods, Jonathan, Heath, Daniel J, Daykin, Jake, Chen-Sverre, Theo, Keenlyside, Benjamin, Mills, Ben, Sagnes, Isabelle, Beaudoine, Gregoire, Blin, Stephane, Garnache, Arnaud, Tropper, Anne C. and Apostolopoulos, Vasileios (2019) Semiconductor disk laser in bi-frequency operation by laser ablation micromachining of a laser mirror. Optics Express, 27 (16), 22316-22316. (doi:10.1364/OE.27.022316).

Woods, Jonathan (2019) Dataset for: Semiconductor disk laser in bi-frequency mode operation by laser micromachining of a laser mirror. University of Southampton doi:10.5258/SOTON/D0874 [Dataset]

Blundell, Sophie Louise, Gorecki, Jonathan, Papasimakis, Nikitas, Mailis, Sakellaris and Apostolopoulos, Vasileios (2019) THz spectroscopy of photogenerated carriers in Fe:LiNbO3 for optical control of 2D materials. In 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE.. (doi:10.1109/CLEOE-EQEC.2019.8871708).

Gray, Alan, Ciaran, Woods, Jonathan, Kahle, Hermann, Carpenter, Lewis Glynn, Berry, Sam, Tropper, Anne, Guina, Mircea, Apostolopoulos, Vasileios, Smith, Peter G.R. and Gawith, Corin (2020) Zinc-indiffused MgO:PPLN waveguides for blue / UV generation via VECSEL pumping. Applied Optics, 59 (16), 4921-4926. (doi:10.1364/AO.387839).

Gorecki, Jonathan, Klokkou, Nicholas, Thomas, Piper, Lewis, Kieran, Mailis, Sakellaris, Papasimakis, Nikitas and Apostolopoulos, Vasileios (2020) High-precision THz-TDS via self-referenced transmission echo method. Applied Optics, 59 (22), 6744-6750. (doi:10.1364/AO.391103).

Talataisong, Wanvisa, Gorecki, Jonathan, Ismaeel, Rand, Beresna, Martynas, Schwendemann, Daniel, Apostolopoulos, Vasileios and Brambilla, Gilberto (2020) Singlemoded THz guidance in bendable TOPAS suspended-core fiber directly drawn from a 3D printer. Scientific Reports, 10 (1), [11045]. (doi:10.1038/s41598-020-68079-y).

Gray, Alan, Ciaran, woods, Jonathan, Kahle, Hermann, Carpenter, Lewis Glynn, Berry, Sam, Tropper, Anne, Guina, Mircea, Apostolopoulos, Vasileios, Smith, Peter G R and Gawith, Corin (2020) Dataset for: Zinc-indiffused MgO:PPLN waveguides for blue / UV generation via VECSEL pumping. University of Southampton doi:10.5258/SOTON/D1244 [Dataset]

Chung, A.L., Mihoubi, Z., Daniell, G.J., Quarterman, A.H., Wilcox, K.G., Beere, H.E., Ritchie, D.A., Tropper, A.C. and Apostolopoulos, V. (2010) Material parameter extraction in THz-TDS using a converging beam transfer function. In 35th International Conference on Infrared, Millimeter, and Terahertz Waves. IEEE. 2 pp . (doi:10.1109/ICIMW.2010.5612537).

Wilcox, K.G., Carswell, A.H.Q.S., Mihoubi, Z., Apostolopoulos, V., Chung, A. and Tropper, A.C. (2010) Mode-locking build-up measurements: probing the mode-locking mechanisms in Vertical-External-Cavity Surface-Emitting Lasers. CLEO/QELS 2010, , San Jose, United States. 16 - 21 May 2010. (doi:10.1364/CLEO.2010.CMY1).

Wilcox, K.G., Kbashi, H.J., Quarterman, A.H., Morris, O.J., Apostolopoulos, V., Henini, M. and Tropper, A.C. (2011) Wetting-layer-pumped continuous-wave surface-emitting quantum-dot laser. IEEE Photonics Technology Letters, 24 (1), 37-39. (doi:10.1109/LPT.2011.2171944).

Wilcox, K.G., Quarterman, A.H., Apostolopoulos, V., Morris, O.J., Head, C.R., Turnbull, A.P., Beere, H.E., Farrer, Ian, Ritchie, David A. and Tropper, A.C. (2012) Femtosecond semiconductor laser emitting high average power 175-GHz pulse train. In Conference on Lasers and Electro-Optics 2012. Optica Publishing Group.. (doi:10.1364/CLEO_AT.2012.JW2A.102).

Quarterman, A.H., Wilcox, K.G., Perevedentsev, A., Apostolopoulos, V., Mihoubi, Z., Chung, A.L., Beere, H.E., Farrer, I., Ritchie, D.A. and Tropper, A.C. (2011) 169 GHz repetition rate passively harmonically mode-locked VECSEL emitting 265 fs pulses. Keller, Ursula (ed.) In Vertical External Cavity Surface Emitting Lasers (VECSELs). SPIE.. (doi:10.1117/12.874573).

Wilcox, K.G., Chung, A., Quarterman, A.H., Mihoubi, Z., Farrer, I., Beere, H.E., Ritchie, D.A., Apostolopoulos, V. and Tropper, A.C. (2011) High peak power femtosecond pulse VECSELs for terahertz time domain spectroscopy. Keller, Ursula (ed.) In Vertical External Cavity Surface Emitting Lasers (VECSELs). vol. 7919, SPIE.. (doi:10.1117/12.874710).

Gorecki, Jonathan, Piper, Lewis Kieran, Noual, Adnane, Mailis, Sakellaris, Papasimakis, Nikitas and Apostolopoulos, Vasileios (2020) Optically reconfigurable graphene/metal metasurface on Fe:LiNbO3 for adaptive THz optics. ACS Applied Nano Materials, 3 (9), 9494-9501. (doi:10.1021/acsanm.0c02243).

Quarterman, A.H., Wilcox, K.G., Apostolopoulos, V., Mihoubi, Z., Barnes, M., Farrer, I., Ritchie, D.A. and Tropper, A.C. (2010) Gain Saturation in 60-fs Mode-Locked Semiconductor Laser. In Conference on Lasers and Electro-Optics 2010. OSA.. (doi:10.1364/CLEO.2010.CMY4).

Woods, Jonathan, Daykin, Jake, Tong, Amy SK, Lacava, Cosimo, Petropoulos, Periklis, Tropper, Anne, Horak, Peter, Wilkinson, James S and Apostolopoulos, Vasileios (2020) Dataset for "Supercontinuum generation in tantalum pentoxide waveguides for pump wavelengths in the 900 nm to 1500 nm spectral region". University of Southampton doi:10.5258/SOTON/D1529 [Dataset]

Quarterman, A.H., Daniell, G.J., Carswell, S., Wilcox, K.G., Mihoubi, Z., Chung, A.L., Apostolopoulos, V. and Tropper, A.C. (2011) Numerical modelling of optical Stark effect saturable absorbers in mode-locked femtosecond VECSELs. Keller, Ursula (ed.) In Vertical External Cavity Surface Emitting Lasers (VECSELs). vol. 7919, SPIE. 7 pp . (doi:10.1117/12.874649).

McBryde, D., Barnes, M.E., Daniell, G.J., Chung, A.L., Mihoubi, Z., Quarterman, A.H., Wilcox, K.G., Tropper, A.C. and Apostolopoulos, V. (2011) Simulation of metallic nanostructures for emission of THz radiation using the lateral photo-Dember effect. In 2011 International Conference on Infrared, Millimeter, and Terahertz Waves. IEEE.. (doi:10.1109/irmmw-THz.2011.6104994).

Woods, Jonathan, Kahle, Hermann, Gray, Alan Ciaran, Daykin, Jake, Tropper, Anne, Gawith, Corin, Guina, Mircea and Apostolopoulos, Vasileios (2021) Dataset for "High power 739 nm VECSELs for future Yb+ ion cooling". University of Southampton doi:10.5258/SOTON/D1669 [Dataset]

Woods, Jonathan, Daykin, Jake, Tong, Amy S.K., Lacava, Cosimo, Petropoulos, Periklis, Tropper, Anne, Horak, Peter, Wilkinson, James S and Apostolopoulos, Vasileios (2020) Supercontinuum generation in tantalum pentoxide waveguides for pump wavelengths in the 900 nm to 1500 nm spectral region. Optics Express, 28 (21), 32173-32184. (doi:10.1364/OE.403089).

Woods, Jonathan, Kahle, Hermann, Gray, Alan, Daykin, Jake, Tropper, Anne, Gawith, Corin, Guina, Mircea and Apostolopoulos, Vasileios (2021) High power 739 nm VECSELs for future Yb+ ion cooling. Applied Optics, 60 (3), 676-680. (doi:10.1364/AO.409970).

Gorecki, Jonathan and Apostolopoulos, Vasileios (2021) Dataset: THz-TDS Parameter Extraction: Empirical Correction Terms for the Analytical Transfer Function Solution. University of Southampton doi:10.5258/SOTON/D1801 [Dataset]

Gorecki, Jonathan and Apostolopoulos, Vasileios (2021) THz-TDS parameter extraction: Empirical correction terms for the analytical transfer function solution. Applied Optics, 60 (13), 4013-4020. (doi:10.1364/AO.420987).

Klokkou, Nicholas Thomas, Gorecki, Jonathan and Apostolopoulos, Vasileios (2021) THz-TDS parameter extraction via machine learning. In IRMMW-THZ 2021. (In Press)

Perivolari, Eleni, D'Alessandro, Giampaolo, Apostolopoulos, Vasileios, Brouckaert, Nicolas, Heiser, Thomas and Kaczmarek, Malgosia (2021) Two-dimensional snapshot measurement of surface variation of anchoring in liquid crystal cells. Liquid Crystals, 48 (15), 1-11. (doi:10.1080/02678292.2021.1928309).

Perivolari, Eleni, Fedotov, Vassili, Apostolopoulos, Vasileios and Kaczmarek, Malgosia (2021) Orientational optical nonlinearity of nematic liquid crystals integrated with THz metamaterials. SPIE Optics & Photonics 2021, Virtual Conference, USA, San Diego, United States. 01 - 05 Aug 2021.

Muskens, Otto, Piper, Lewis, Kieran, Singh, Haobijam, Woods, Jonathan, Sun, Kai and Apostolopoulos, Vasileios (2021) Dataset for Mechanically tunable terahertz metamaterial perfect absorber. University of Southampton doi:10.5258/SOTON/D1888 [Dataset]

Talataisong, Wanvisa, Gorecki, Jonathan, Van Putten, Lieke, Ismaeel, Rand, Williamson, James, Addinall, Katie, Schwendemann, Daniel, Beresna, Martynas, Apostolopoulos, Vasileios and Brambilla, Gilberto (2021) Hollow-core antiresonant terahertz fiber-based TOPAS extruded from a 3D printer using a metal 3D printed nozzle. Photonics Research, 9 (8), 1513-1521, [420672]. (doi:10.1364/PRJ.420672).

Perivolari, Eleni, Apostolopoulos, Vasileios, Kaczmarek, Malgosia and Fedotov, Vassili (2021) Anomalous resonance frequency shift in liquid crystal-loaded metamaterials. CLEO/Europe-EQEC 2021 Virtual Meeting, Europe, Virtual. 21 - 25 Jun 2021. (doi:10.1109/CLEO/Europe-EQEC52157.2021.9541828).

Piper, Lewis K., Singh, H. Johnson, Woods, Jonathan R. C., Sun, Kai, Muskens, Otto L. and Apostolopoulos, Vasilis (2021) Mechanically tunable terahertz metamaterial perfect absorber. Advanced Photonics Research, 2 (12), 2100136. (doi:10.1002/adpr.202100136).

Aghajani, A., Murugan, G.S., Sessions, N.P., Apostolopoulos, V. and Wilkinson, J.S. (2015) Spectroscopy of high index contrast Yb:Ta2O5 waveguides for lasing applications. Journal of Physics: Conference Series, 619, [012031]. (doi:10.1088/1742-6596/619/1/012031).

Chodorow, U., Mavrona, E., Chojnowska, O., Garbat, K., Walczakowski, M., Saizek, S., Blach, J. F., Apostolopoulos, V., Kaczmarek, M. and Parka, J. (2015) Terahertz properties of liquid crystals doped with ferroelectric BaTiO3 nanoparticles prepared by the sol-gel process. In Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015. Optical Society of America..

Klokkou, Nicholas T., Rowe, David J., Bowden, Bethany M., Sessions, Neil P., West, Jonathan J., Wilkinson, James S. and Apostolopoulos, Vasilis (2022) Structured surface wetting of a PTFE flow-cell for terahertz spectroscopy of proteins. Sensors and Actuators B: Chemical, 352, [131003]. (doi:10.1016/j.snb.2021.131003).

Perivolari, Eleni, Apostolopoulos, Vasilis, Kaczmarek, Malgosia and Fedotov, Vassili A. (2021) Anomalous resonance frequency shift in liquid crystal-loaded metamaterials. In European Quantum Electronics Conference, EQEC 2021. OSA..

Gow, P. C., McBryde, D., Berry, S. A., Barnes, M. E. and Apostolopoulos, V. (2015) Double-metal schottky enhanced THz emitters. In Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015. Optical Society of America..

Maple, L. C., Stenning, G. B.G., Bowden, G., Berry, S. A., De Groot, P. A.J. and Apostolopoulos, V. (2014) A metamaterial inspired microwave antenna design for coplanar waveguides. In European Quantum Electronics Conference, EQEC 2015. OSA..

Mihoubi, Zakaria, Wilcox, Keith G., Elsmere, Stephen, Quarterman, Adrian, Rungsawang, Rakchanok, Farrer, Ian, Beere, Harvey E., Ritchie, David A., Tropper, Anne and Apostolopoulos, Vasileios (2008) First demonstration of an all-semiconductor room-temperature terahertz time-domain spectrometer. In Laser Science, LS 2008. Optical Society of America.. (doi:10.1364/ls.2008.lmd5).

Wilcox, Keith G., Quarterman Stewart Carswell, Adrian H., Mihoubi, Zakaria, Apostolopoulos, Vasilis, Chung, Aaron and Tropper, Anne (2010) Mode-locking build-up measurements: Probing the mode-locking mechanisms in vertical-external-cavity surface-emitting lasers. In Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010.

Quarterman, Adrian H., Wilcox, Keith G., Apostolopoulos, Vasilis, Mihoubi, Zakaria, Barnes, Mark, Farrer, Ian, Ritchie, David A. and Tropper, Anne (2010) Gain saturation in 60-fs mode-locked semiconductor laser. In Conference on Lasers and Electro-Optics, CLEO 2010.

Apostolopoulos, V., Laversenne, L., Colomb, T., Depeursinge, C., Salathé, R. P., Pollnau, M., Osellame, R., Cerullo, G. and Laporta, P. (2004) Femtosecond irradiation induced refractive-index changes and channel waveguiding in bulk Ti3+:sapphire. In Conference on Lasers and Electro-Optics/International Quantum Electronics Conference and Photonic Applications Systems Technologies. Optica Publishing Group. pp. 387-388 .

Fedotov, Vasily, Perivolari, Eleni, Apostolopoulos, Vasileios, Kaczmarek, Malgosia and Parka, Janusz (2022) Anomalous resonance frequency shift in liquid crystal-loaded THz metamaterials. Nanophotonics. (doi:10.1515/nanoph-2022-0036).

Phanchat, Natthawat, Talataisong, Wanvisa, Klokkou, Nicholas, Thomas, Chitaree, Ratchapak, Apostolopoulos, Vasileios, Beresna, Martynas and Brambilla, Gilberto (2022) Extruded TOPAS hollow-core anti-resonant fiber optimized for THz guidance at 0.9THz. Optics Express, 30 (8), 13059-13069. (doi:10.1364/OE.450550).

Contact

Telephone: +44 (0) 23 8059 9620

Email: V.Apostolopoulos@soton.ac.uk

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