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Grating-Assisted Polarization-Insensitive Dual-Mode Spatial Light Modulator Design Using Epsilon-Near-Zero Material.
- Source :
-
IEEE Journal of Quantum Electronics . Aug2022, Vol. 58 Issue 4, p1-8. 8p. - Publication Year :
- 2022
-
Abstract
- Electro-tunable metamaterials opened new doors to realize spatial light modulation at nanoscale by engineering meta-atoms at sub-wavelength scale. In this study, we propose a novel design of polarization-insensitive spatial light modulator that can operate in both transmission and reflection modes. We leverage GMR (guided-mode resonance)-effect of grating waveguide and ENZ (epsilon-near-zero) phenomenon of ITO (indium-tin-oxide) to realize an efficient electro-optic modulation. The proposed design consists of a two-dimensional array of silicon-nitride nanograting on top of ITO-integrated silicon-on-insulator platform. Effective medium theory combined with temporal coupled-mode analysis is used to examine the excitation of waveguide mode via coupling of spatial light. Upon applying external bias-voltage when ITO exhibits ENZ-effect by accumulating free-carriers at ITO–Al2O3 interface, the resonance feature disappears due to large modal loss. A modulation depth of ~0.96 (~0.85) in reflection (transmission)-mode is achieved for normally incident plane wave with random polarization angle at $1.55 ~\mu \text{m}$ wavelength. In addition, the operating wavelength can be shifted by utilizing frequency-scaling property of the proposed design. With ~774 Mbps modulation speed, the proposed scalable design paves the way toward the realization of tunable flat-optical components for integrated nanophotonic systems. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189197
- Volume :
- 58
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Journal of Quantum Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 158803891
- Full Text :
- https://doi.org/10.1109/JQE.2022.3166653