Broadband Achromatic Anomalous Mirror in Near-IR and Visible Frequency Ranges
| Autor: | Andrei Nemilentsau, Tony Low |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics::Optics
Joule 02 engineering and technology Plasma oscillation 01 natural sciences law.invention Resonator Optical path Optics law 0103 physical sciences Electrical and Electronic Engineering 010306 general physics Plasmon Physics business.industry Plane mirror 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Achromatic lens Reflection (physics) Optoelectronics 0210 nano-technology business Biotechnology |
| Zdroj: | ACS Photonics. 4:1646-1652 |
| ISSN: | 2330-4022 |
| Popis: | 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° 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. |
| Databáze: | OpenAIRE |
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