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Opt Lett. 2012 Aug 1;37(15):3237-9. doi: 10.1364/OL.37.003237.

Giant Faraday and Kerr rotation with strained graphene.

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1
Information Storage and Materials Laboratory, Electrical and Computer Engineering Department, National University of Singapore, Singapore. elemjc@nus.edu.sg

Abstract

Polarized electromagnetic waves passing through (reflected from) a dielectric medium parallel to a magnetic field undergo Faraday (Kerr) rotation of their polarization. Recently, Faraday rotation angles as much as 0.1 rad were observed for terahertz waves propagating through graphene over a SiC substrate. We show that the same effect is observable with the magnetic field replaced by an in-plane strain field which induces a pseudomagnetic field in graphene. With two such sheets a rotation of π/4 can be achieved, which is the required rotation for an optical diode. Similarly a Kerr rotation of 1/4 rad is predicted from a single reflection from a strained graphene sheet.

PMID:
22859144
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