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Complete spectral gap in coupled dielectric waveguides embedded into metal

Liu, Wei; Sukhorukov, Andrey; Miroshnichenko, Andrey; Poulton, Chris; Xu, Zhiyong; Neshev, Dragomir; Kivshar, Yuri

Description

We study a plasmonic coupler involving backward (TM_01) and forward (HE_11) modes of dielectric waveguides embedded into infinite metal. The simultaneously achievable contradirectional energy flows and codirectional wavevectors in different channels lead to a spectral gap, despite the absence of periodic structures along the waveguide. We demonstrate that a complete spectral gap can be achieved in a symmetric structure composed of four coupled waveguides.

CollectionsANU Research Publications
Date published: 2010-05-07
Type: Journal article
URI: http://hdl.handle.net/1885/15509
Source: Applied Physics Letters
DOI: 10.1063/1.3458694

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