期刊
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
卷 35, 期 4, 页码 950-957出版社
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.35.000950
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资金
- National Program on Key Basic Research Project of China [2014CB339806]
- Major National Development Project of Scientific Instrument and Equipment [2017YFF0106300, 2016YFF0100503]
- National Natural Science Foundation of China (NSFC) [61307126]
- Key Scientific and Technological Project of Science and Technology Commission of Shanghai Municipality (STCSM) [15DZ0500102]
- Shanghai Leading Talent [2016-019]
- Young Yangtze River Scholar [Q2016212]
A reflective broadband terahertz (THz) linear-to-circular (LTC) polarization converter based on a single-layer ultrathin metasurface is designed and experimentally demonstrated. Two different-size rectangular ultrathin metasurface micro-structures are proposed to realize such a broadband THz LTC polarization converter with bandwidth ranging from 0.832 to 1.036 THz. The phase delay between two orthogonal resonance modes is -90 degrees +/- 5 degrees. These qualities are realized mainly by combining two separated LTC polarization conversion frequencies and the benefit of the coupling between two different-size rectangles. The calculated results indicate that the bandwidth of the LTC polarization converter is controlled via the dimensions and period of the structure. This kind of ultrathin broadband THz polarization converter can be widely applied into wireless communication, imaging, and detection, and can widen the path to designing novel functional THz devices. (c) 2018 Optical Society of America
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