| Autor: |
Shota Kita, Kenta Takata, Masaaki Ono, Kengo Nozaki, Eiichi Kuramochi, Koji Takeda, Masaya Notomi |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
APL Photonics, Vol 2, Iss 4, Pp 046104-046104-10 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
2378-0967 |
| DOI: |
10.1063/1.4978662 |
| Popis: |
Recently, coherent control of absorption in metallic metasurfaces has been demonstrated, and this phenomenon was applied to intriguing light-by-light switching operation. Here we experimentally demonstrate coherent control of beam deflection by high-efficiency metasurfaces for the first time. Although the beam deflection efficiency by a metasurface is generally small, high-efficiency metasurfaces, which consist of a single layer metasurface with a back reflector, are known to exhibit significantly high deflection efficiency. A key point of our study is to replace the back reflector with a partial reflector instead, which enables light-by-light control of a high-efficiency metasurface with a pair of counter-propagating coherent beam inputs. By adjusting the partial reflector thickness appropriately, the proposed device outperforms ones without a reflector, especially for the deflection efficiency. We finally experimentally demonstrate the expected operation of the fabricated device at a visible wavelength, which reveals that the deflection efficiency of 45% (49% in theory). This result demonstrates highly efficient light-by-light control of the beam deflection by a metasurface, which opens up possible applications to ultrathin photonic devices for linear all-optical switching and logic functions. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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