Journal
OPTICS LETTERS
Volume 44, Issue 23, Pages 5683-5686Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.005683
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Funding
- National Natural Science Foundation of China [61671491, 61805123, 61831012]
- Natural Science Foundation of Tianjin City [18JCQNJC02200]
- Fundamental Research Funds for the Central Universities, Nankai University [63191432]
- State's Key Project of Research and Development Plan [2017YFA0701000]
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In this Letter, we propose a hybrid graphene-dielectric metasurface as a bi-functional polarization converter. It can switch between a reflective half-wave plate and a quarter-wave plate around 1 THz by merely applying external biasing voltage, without reoptimizing the dielectric structure. Switching of the two wave plates originates from distinct dispersion of the orthogonal eigenmodes with the chemical potential, which is further explained by the overlapping of graphene and the dielectric resonance modes. Compared with graphene-metallic metasurfaces, a combination of graphene with dielectric microstructures offers an alternative solution for active terahertz devices with high efficiency and large flexibility. (C) 2019 Optical Society of America
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