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High‐Speed Transmission Control in Gate‐Tunable Metasurfaces Using Hybrid Plasmonic Waveguide Mode
Author(s) -
Lee Yohan,
Yun Jeongse,
Kim SunJe,
Seo Minjee,
In Sungjun,
Jeong HeeDong,
Lee SeungYeol,
Park Namkyoo,
Chung Taek Dong,
Lee Byoungho
Publication year - 2020
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202001256
Subject(s) - materials science , transmittance , optoelectronics , plasmon , modulation (music) , dielectric , optics , waveguide , transmission (telecommunications) , indium tin oxide , nanotechnology , telecommunications , thin film , computer science , physics , philosophy , aesthetics
Dynamic control of light based on gate‐tunable metasurfaces has revolutionized traditional optoelectronic devices due to its unprecedented compactness and versatile functionalities. However, these devices are typically based on metal‐insulator‐metal geometries that enable field‐effect modulation of only reflected light. Transmittance modulation techniques based on dielectric metasurfaces, despite their large modulation depth, have a disadvantage of low modulation speed due to high resistance of dielectric materials. Here, a high‐efficiency transmittance modulator that enables high switching speed, as well as large modulation depth, is demonstrated using indium‐tin‐oxide‐based metasurfaces. To realize these devices, the hybrid plasmonic waveguide mode is used which allows electromagnetic energy storage within the nanoscale permittivity‐tunable region between metal and high‐refractive dielectric layers. Experimental measurements reveal a change in the transmittance (≈33%) by applying 6 V gate bias, and a fast modulation speed (≈826 kHz of 3 dB cut‐off frequency). This work provides a promising avenue for developing ultracompact optical components such as dynamic holograms, lenses with active focal lengths, or spatial light modulators.