期刊
ACS PHOTONICS
卷 4, 期 7, 页码 1646-1652出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00922
关键词
anomalous mirror; gradient metasurface; achromatic reflection; gap plasmons; metal-insulator-metal resonators
类别
资金
- DARPA [FA8650-16-2-7640]
An anomalous achromatic mirror operating in the near-IR and visible frequency ranges was designed using an array of metal-insulator-metal (MIM) resonators. An incident wave interacting with the MIM resonator experiences phase shift that is equal to the optical path traveled by the gap plasmon excited by the wave. A phase gradient along the mirror surface is created through the difference in plasmon optical paths in the resonators of varying lengths. In a frequency region well below the plasma frequency of metal, the phase gradient is a linear function of frequency, and thus the mirror operates in the achromatic regime; that is, the reflection angle does not depend on the radiation frequency. Using silver-air-silver resonators, we predicted that the mirror can steer a normally incident beam to angles as large as 40 degrees with high radiation efficiency (exceeding 98%) and small Joule losses (below 10%). Our study indicates that it is feasible to create an efficient broadband anomalous mirror.
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