期刊
NANO LETTERS
卷 17, 期 1, 页码 407-413出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04378
关键词
Metasurface; electrical gating; phase control; polarization control
类别
资金
- California Metaphotonics Cluster by the Samsung corporation
- Naval Research Laboratories
Optical metasurfaces are two-dimensional optical elements composed of dense arrays of subwavelength optical antennas and afford,on-demand, manipulation of the basic properties of light waves. Following the pioneering works on active metasurfaces capable of modulating wave amplitude, there is now a growing interest to dynamically control other fundamental properties of light. Here, we present metasurfaces that facilitate electrical tuning of the reflection phase and polarization properties. To realize these devices, we leverage the properties of actively controlled plasmonic antennas and fundamental: insights provided by coupled mode theory. Indium-tin-oxide is embedded into gap-plasmon resonator-antennas as it Offers electrically tunable optical properties. By judiciously controlling the resonant properties of the antennas from under- to overcoupling regimes, we experimentally demonstrate tuning of the reflection phase over 180 degrees. This work Opens up new design strategies for active metasurfaces for displacement measurements and tunable waveplates.
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