Ren-Hao Fan,* Ru-Wen Peng, Mu Wang
National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
Nano-Micro Conference, 2017, 1, 01012
Published Online: 06 October 2017 (Abstract)
Here we present our recent work on tuning the polarization of terahertz waves via subwavelength metallic gratings. Firstly, we have experimentally demonstrated a linear polarization rotator that is a three-layer metallic grating structure for manipulating the polarization of broadband terahertz waves. By mechanical rotations of the composite grating layers, this freely tunable device can rotate the polarization of a linearly polarized THz wave to any desired direction with high conversion efficiency . Then we theoretically investigate the propagation of terahertz waves through a graphene-loaded metal grating under external magnetic field. It is found that resonant modes in the system can be converted between transverse-electric and transverse-magnetic polarizations due to Hall conductivity of grapheme, as a consequence, asymmetric transmission of terahertz waves through this graphene-loaded metal grating is achieved, and it can be tuned by adjusting either the external magnetic field or the Fermi level of grapheme . These tunable terahertz devices have potential applications in various areas, such as material analysis, wireless communication, and terahertz imaging.
 R. H. Fan; Y. Zhou; X. P. Ren; R. W. Peng; S. C. Jiang; D. H. Xu; X. Xiong; X. R. Huang; Mu Wang, Freely tunable broadband polarization rotator for terahertz waves. Advanced Materials. 27, 1201 (2015). doi:10.1002/adma.201404981
 Y. Zhou; Y. Q. Dong; R. H. Fan; Q. Hu; R. W. Peng; Mu Wang, Asymmetric transmission of terahertz waves through a graphene-loaded metal grating. Applied Physics Letters. 105, 041114 (2014). doi:10.1063/1.4891818
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