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Enhanced Faraday rotation and magneto-optical figure of merit in gold grating/graphene/silicon hybrid magneto-plasmonic devices

Authors :
Jun Qin
Shuang Xia
Ke Jia
Chuangtang Wang
Tingting Tang
Haipeng Lu
Li Zhang
Peiheng Zhou
Bo Peng
Longjiang Deng
Lei Bi
Source :
APL Photonics, Vol 3, Iss 1, Pp 016103-016103-8 (2018)
Publication Year :
2018
Publisher :
AIP Publishing LLC, 2018.

Abstract

Graphene is a promising THz magneto-optical material. However, high Faraday rotation is only achievable at a low THz frequency range in single layer graphene. In this paper, we report simultaneous Faraday rotation and optical transmission enhancement in Au grating/graphene/silicon hybrid plasmonic structures across a wide frequency range from 0.43 to 24 THz using extraordinary transmission of THz spoof surface plasmons. In a broad frequency range up to 13.1 THz, the Faraday rotation and magneto-optical figure of merit in this hybrid structure can exceed the maximum value of single layer graphene at the low THz frequency range. Numerical analysis on the device dispersion relation indicates that the mechanism of simultaneous Faraday rotation and transmission enhancement is due to coupling of the TE waveguide mode with the TM hybrid waveguide-plasmon mode. Our work demonstrates the hybrid plasmonic structure as a promising candidate for THz nonreciprocal photonic device applications.

Details

Language :
English
ISSN :
23780967
Volume :
3
Issue :
1
Database :
Directory of Open Access Journals
Journal :
APL Photonics
Publication Type :
Academic Journal
Accession number :
edsdoj.92e0d315f704466b3a880a3c2f08498
Document Type :
article
Full Text :
https://doi.org/10.1063/1.5008775