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A One‐Way Mirror: High‐Performance Terahertz Optical Isolator Based on Magnetoplasmonics
Author(s) -
Lin Shuai,
Silva Sinhara,
Zhou Jiangfeng,
Talbayev Diyar
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800572
Subject(s) - isolator , optical isolator , materials science , terahertz radiation , transmittance , optics , optoelectronics , oblique case , magnetic field , physics , electrical engineering , laser , linguistics , philosophy , quantum mechanics , engineering
The magneto‐optical properties of conduction electrons in InSb in Voigt geometry at oblique incidence angles are explored. In parallel magnetic field, the oblique incidence reflectance exhibits high nonreciprocity, while the transmittance remains reciprocal. This phenomenology, combined with the unique magnetoplasmonic properties of InSb (high electron mobility, low effective mass, and temperature‐tunable bulk plasma frequency), allows the design of a simple and high‐performance THz optical isolator that works directly with linearly polarized light. It is demonstrated that the isolation power of the device exceeds 35 dB with the insertion loss of only −6.2 dB. The simplicity of the isolator design is unmatched among the proposed THz isolator concepts to date.