Near optimal graphene terahertz non-reciprocal isolator

• DOI: 10.1038/ncomms11216
• Publication Date: 2016-04-06T09:35:54Z
• Authors: Michele Tamagnone; Clara Moldovan; Jean-Marie Poumirol; Alexey B. Kuzmenko; Adrian M. Ionescu; Juan R. Mosig; Julien Perruissea...
• Keywords: Isolator; Reciprocal

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