Graphene-assisted control of coupling between optical waveguides

Year: 2012

Authors: Locatelli A., Capobianco A.D., Midrio M., Boscolo S., De Angelis C.

Autors Affiliation: Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia, Brescia 25123, Italy; Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Padova, Padova 35131, Italy; Dipartimento di Ingegneria Elettrica Gestionale e Meccanica, Università degli Studi di Udine, Udine 33100, Italy

Abstract: The unique properties of optical waveguides electrically controlled by means of graphene layers are investigated. We demonstrate that, thanks to tunable losses induced by graphene layers, a careful design of silicon on silica ridge waveguides can be used to explore passive PT-symmetry breaking in directional couplers. We prove that the exceptional point of the system can be probed by varying the applied voltage and we thus propose very compact photonic structures which can be exploited to control coupling between waveguides and to tailor discrete diffraction in arrays. (C) 2012 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 20 (27)      Pages from: 28479  to: 28484

More Information: AL and CDA acknowledge financial support from Cariplo Foundation under grant no. 2010-0595, and from US Army under grant no. W911NF-12-1-0202.
DOI: 10.1364/OE.20.028479

Citations: 24
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