Dr. Bigeng Chen Profile

Dr. Bigeng Chen

at Univ of Southampton

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Author

Publications (6)

Proceedings Article | 13 March 2024 Presentation

The next phase of all silicon electro-optical modulators

Weiwei Zhang, Martin Ebert, Ke Li, Bigeng Chen, Xingzhao Yan, Han Du, Mehdi Banakar, Dehn T. Tran, Callum Littlejohns, Graham Reed, David Thomson

Proceedings Volume PC12891, PC1289109 (2024) https://doi.org/10.1117/12.2691582

KEYWORDS: Silicon, Modulation, Electrooptic modulators, Electro optics, Transmitters, Molybdenum, Waveguides, Silicon photonics, Resonators, Power consumption

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Proceedings Article | 5 March 2022 Presentation

MOSCAP and 3D taper

David Thomson, Weiwei Zhang, Martin Ebert, Ke Li, Jamie Reynolds, Bigeng Chen, Xingzhao Yan, Han Du, Mehdi Banakar, Ying Tran, Callum Littlejohns, Graham Reed

Proceedings Volume PC12006, PC1200602 (2022) https://doi.org/10.1117/12.2605906

KEYWORDS: Waveguides, Optical modulators, Silicon photonics, Silicon, Plasma, Oxides, Etching, Dispersion, Capacitance

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Proceedings Article | 6 October 2021 Presentation

Capacitive silicon optical modulators for high-speed and high-efficiency operation

David Thomson, Bigeng Chen, Weiwei Zhang, Martin Ebert, Xia Chen, Jamie Reynolds, Xingzhao Yan, Han Du, Mehdi Banakar, Ying Tran, Kapil Debnath, Callum Littlejohns, Shin Saito, Graham Reed

Proceedings Volume 11880, 118800J (2021) https://doi.org/10.1117/12.2603017

KEYWORDS: Silicon, Optical modulators, Waveguides, Silicon photonics, Phase shifts, Optics manufacturing, Modulators, Modulation, Manufacturing, Electronics

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Proceedings Article | 25 October 2018 Paper

Germanium implanted photonic devices for post-fabrication trimming and programmable circuits

Xia Chen, Milan Milosevic, Xingshi Yu, Bigeng Chen, Antoine F. Runge, Ali Z. Khokhar, Sakellaris Mailis, David Thomson, Anna Peacock, Shinichi Saito, Otto Muskens, Graham Reed

Proceedings Volume 10823, 108230U (2018) https://doi.org/10.1117/12.2503224

KEYWORDS: Annealing, Waveguides, Resonators, Silicon, Germanium, Silicon photonics, Refractive index, Photonic devices, Ion implantation

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Proceedings Article | 23 May 2018 Presentation

Plasmonic nanoantennas for nanometer, picosecond, control of VO2 phase-transition (Conference Presentation)

Bigeng Chen, Otto Muskens, Daniel Traviss, Yudong Wang, C. de Groot, David Sheel, Luca Bergamini, Javier Aizpurua, Nerea Zabala, Jeffrey Gaskell

Proceedings Volume 10672, 106721V (2018) https://doi.org/10.1117/12.2307374

KEYWORDS: Modulation, Nanoantennas, Vanadium, Phase shift keying, Antennas, Gold, Spectroscopy, Dielectrics, Light harvesting, Light-matter interactions

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Single-nanoantenna has intrigued vast interest due to its exceptional properties such as light harvesting and field enhancement, which provide the opportunities for strengthening light-matter interaction and efficient photon manipulation in nano-scale, as well as boosting nonlinear response. On the other hand, materials with structural or electronic phase transition have been employed to achieve large optical modulation contrast and order-unity switching, making them promising building blocks for high-performance optical circuits and devices with ultra-small footprint. In this context we demonstrate nano-scale all-optical modulation with single Au antennas fabricated on phase-transition material vanadium dioxide (VO2) substrate. VO2 films are deposited on boroaluminosilicate glass coated with a 30-nm layer of fluorine-doped tin oxide. The inclusion of this intermediate layer allows the production of VO2 films with low surface roughness and suitable thermochromic transition temperature. Then the nanoantennas are fabricated by e-beam lithography and subsequent 45-nm-thick gold deposition on the VO2 substrate. A 5-nm-thick Ti layer is used to improve the adhesion of the gold to the VO2. We use a pump-probe spectroscopy to characterize the modulation feature of the antenna/VO2. The pump beam at 1060 nm wavelength is used to introduce a local heating for VO2's phase transition and the probe beam from 1100 nm to 2000 nm wavelength is for readout of the modulated local transmission of antenna/VO2 hybrid owing to the dielectric environment change. A spatial modulation technique is also used to extract the differential transmission (ΔT/T) around the antennas. As a result, with pump pulse energy increasing to less than 1 nJ, the measured ΔT/T of single-antenna//VO2 hybrid exhibits substantial change that crossing the zero line and significant blue shift. As reported the ΔT/T obtained from spatial modulation spectroscopy is supposed to be proportional to the antenna’s extinction cross section. However, with the obtained negative values which lead to unphysical extinction cross sections less than 0, we believe the VO2 substrate beneath the antennas is highly involved as its optical property has been modified considerately. In addition, we observe that the pump-modulated differential transmission of the antenna/VO2 hybrid evidently depends on the polarisation of the pump when it is below a certain level. In this regime, the parallel pumping excites the longitudinal resonant mode while the perpendicular one only induces non-resonant absorption of antenna’s transverse mode. Going beyond this regime, the stronger pump transits the VO2 substrate from insulating phase into metallic phase completely, which dominates the dielectric environment change of the antenna, leading to nearly polarisation-independent modulation. The time for fully switch-on obtained from the pump-probe measurement is less than 50 ps. We also investigate the time response of the differential transmission dependent on the pulse repetition rate and substrate temperature, respectively. Less modulation depth with repetition rate over 2 MHz or base temperature higher than 40 °C suggest that the heat accumulation from adjacent pulses and thermal equilibrium time plays important roles in the achievable modulation speed. The single-antenna/VO2 structure may find applications in nano-scale optoelectronics for multiple functionalities including modulation, memory and so on.

Proceedings Article | 11 October 2017 Presentation

Tunable plasmonics and metasurfaces for applications in optical switching and space technology (Conference Presentation)

Otto Muskens, Kai Sun, Christoph Riedel, Bigeng Chen, Cornelis Hendrik De Groot

Proceedings Volume 10346, 1034609 (2017) https://doi.org/10.1117/12.2274010

KEYWORDS: Plasmonics, Antennas, Vanadium, Oxides, Optical switching, Aerospace engineering, Light-matter interactions, Silicon, Waveguides, Integrated optics

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