Optical modulation in epsilon-near-zero materials

Qin Chen; Long Wen

doi:10.1117/12.2575287

10 October 2020 Optical modulation in epsilon-near-zero materials

Qin Chen, Long Wen

Proceedings Volume 11557, Plasmonics V; 115570D (2020) https://doi.org/10.1117/12.2575287
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

Epsilon-near-zero materials such as transparent conductive oxides (TCOs) have been attracting extensive research interests due to its extremely strong light field confinement. Combined with plasmonic/metasurface structures, remarkable intensity and phase modulations have been observed. However, the operation wavelength bandwidth is limited by the narrowband property of both the resonators and the ENZ effect. In this talk, two schemes to expand the bandwidth will be discussed. One is a dual-resonance coupling method, where the ENZ mode of TCOs is coupled to both magnetic resonance and FP resonance respectively by tuning the bias. The other scheme is a dual-ENZ coupling method, where the ENZ modes of both silicon and TCOs are coupled to the resonant modes of nanotrenches. Both schemes are found to significantly increase the modulation depth-bandwidth product. The results are useful to understand the physics in ENZ-resonance coupling and its operating mechanism in light modulations.

Conference Presentation

Citation Download Citation

Qin Chen and Long Wen "Optical modulation in epsilon-near-zero materials", Proc. SPIE 11557, Plasmonics V, 115570D (10 October 2020); https://doi.org/10.1117/12.2575287

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