Manipulation on radiation angles via spatially organized multipoles with vertical split-ring resonators.

Autor:	Tsai HY; Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan., Chen CC; Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu, 30076, Taiwan., Chen CY; Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan., Lin YJ; Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan., Chen WC; Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu, 30076, Taiwan., Chen HP; Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu, 30076, Taiwan., Lin YW; Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu, 30076, Taiwan., Tanaka T; Metamaterials Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.; Innovative Photon Manipulation Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako, Saitama, 351-0198, JAPAN., Yen TJ; Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan.
Jazyk:	angličtina
Zdroj:	Nanophotonics (Berlin, Germany) [Nanophotonics] 2023 Oct 05; Vol. 12 (20), pp. 3921-3930. Date of Electronic Publication: 2023 Oct 05 (Print Publication: 2023).
DOI:	10.1515/nanoph-2023-0386
Abstrakt:	Herein, the radiation patterns of single-split ring resonators (SSRRs) and double-split ring resonators (DSRRs) in the vertical direction are tailored by reconfiguring the resonator geometries. To design unequal arm lengths for controlling the floating split angle of the resonators and changing their electromagnetic multipole compositions, vertical metamaterials were fabricated using the metal-stress-driven self-folding method. The simulation results well agree with the experimental transmittance and reflectance results and demonstrate the geometry-dependent angle variation of the far-field radiation. Symmetric SSRRs and DSRRs radiate in the vertical and horizontal directions, respectively. With increasing pad shift, the radiation angle of the asymmetric SSRR completely rotates toward the horizontal direction along the ring plane, but the DSRRs can rotate only from 0° to 45° to the horizontal plane. Furthermore, by decomposing the multipoles into their constituents, we show that the directional scattering performance can be verified by manipulating the horizontal and vertical components of the electric dipoles. This novel combination of SSRRs and DSRRs can effectively and efficiently reconfigure the radiation direction in the infrared (IR) region, paving the way for color routers, metasurfaces, and directive IR emitters in compact optical metadevices. Competing Interests: Conflict of interest: The authors declare no conflict of interest. (© 2023 the author(s), published by De Gruyter, Berlin/Boston.)
Databáze:	MEDLINE
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