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Scientific article
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Near optimal graphene terahertz non-reciprocal isolator

Published inNature communications, vol. 7, no. 1, 11216
Publication date2016-04-06
First online date2016-04-06
Abstract

Isolators, or optical diodes, are devices enabling unidirectional light propagation by using non-reciprocal optical materials, namely materials able to break Lorentz reciprocity. The realization of isolators at terahertz frequencies is a very important open challenge made difficult by the intrinsically lossy propagation of terahertz radiation in current non-reciprocal materials. Here we report the design, fabrication and measurement of a terahertz non-reciprocal isolator for circularly polarized waves based on magnetostatically biased monolayer graphene, operating in reflection. The device exploits the non-reciprocal optical conductivity of graphene and, in spite of its simple design, it exhibits almost 20 dB of isolation and only 7.5 dB of insertion loss at 2.9 THz. Operation with linearly polarized light can be achieved using quarter-wave plates as polarization converters. These results demonstrate the superiority of graphene with respect to currently used terahertz non-reciprocal materials and pave the way to a novel class of optimal non-reciprocal devices.

Research group
Funding
  • UK Research and Innovation - Widening BU-CERT Threat Intelligence activities (WIDECERT) [133583]
Citation (ISO format)
TAMAGNONE, Michele et al. Near optimal graphene terahertz non-reciprocal isolator. In: Nature communications, 2016, vol. 7, n° 1, p. 11216. doi: 10.1038/ncomms11216
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ISSN of the journal2041-1723
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