Manipulation on radiation angles via spatially organized multipoles with vertical split-ring resonators
Author:
Tsai Hao-Yuan1, Chen Che-Chin2, Chen Chun-Yen1, Lin Yi-Jie1, Chen Wei-Chun2, Chen Hung-Pin2ORCID, Lin Yu-Wei2, Tanaka Takuo34ORCID, Yen Ta-Jen1ORCID
Affiliation:
1. Materials Science and Engineering , National Tsing Hua University , Hsinchu , Taiwan 2. Taiwan Instrument Research Institute, National Applied Research Laboratories , Hsinchu , 30076 , Taiwan 3. Metamaterials Laboratory , RIKEN Cluster for Pioneering Research , 2-1 Hirosawa , Wako , Saitama , 351-0198 , Japan 4. Innovative Photon Manipulation Research Team , RIKEN Center for Advanced Photonics , 2-1 Hirosawa , Wako , Saitama , 351-0198 , JAPAN
Abstract
Abstract
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.
Funder
Ministry of Education, High Entropy Materials Center National Science and Technology Council
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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