Electrically tunable metasurface by using InAs in a metal-insulator-metal configuration
- Authors
- Park, Junghyun; Kim, Seong Jun; Sorger, Volker J.; Kim, Soo Jin
- Issue Date
- 21-Mar-2022
- Publisher
- WALTER DE GRUYTER GMBH
- Keywords
- InAs; metasurface; optical modulator; surface plasmonics; wavefront shaping
- Citation
- NANOPHOTONICS, v.11, no.6, pp.1117 - 1126
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOPHOTONICS
- Volume
- 11
- Number
- 6
- Start Page
- 1117
- End Page
- 1126
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/140262
- DOI
- 10.1515/nanoph-2021-0618
- ISSN
- 2192-8606
- Abstract
- The ability of modulating optical properties at a lateral subwavelength scale is of crucial importance due to its potential applications for wide-angle holographic displays, optical communications, and interferometric sensors. Here, we present an electrically tunable metasurface whose optical properties can be element-wise controlled at the lateral subwavelength scale in the mid-infrared wavelength regime. Our proposed device facilitates an n-doped InAs layer as a dynamic-tunable layer, and the charge carrier concentration inside the InAs layer is tailored by external gate biases. This InAs active layer is sandwiched between top aluminum strip antennas and a bottom gold substrate, forming the metal-insulator-metal configuration. The change of the charge carrier concentration gives rise to modulation of the amplitude and phase of reflected light in a mid-infrared regime. Numerical investigations show the reflectivity contrast of 44%P with biases of -2.5-0 V and the phase change of 236 degrees with biases of -15 V to +15 V at the wavelength of similar to 5 mu m. Versatile wavefront shaping such as beam focusing with Fresnel Zone plate and beam steering with saw-tooth phase grating is also provided.
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