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Near optimal graphene terahertz non-reciprocal isolator.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tamagnone M,Moldovan C,Poumirol JM,Kuzmenko AB,Ionescu AM,Mosig JR,Perruisseau-Carrier J

doi

10.1038/ncomms11216

subject

Has Abstract

pub_date

2016-04-06 00:00:00

pages

11216

issn

2041-1723

pii

ncomms11216

journal_volume

7

pub_type

杂志文章

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