Complete spectral gap in coupled dielectric waveguides embedded into metal

Details Complete spectral gap in coupled dielectric waveguides embedded into metal Complete spectral gap in coupled dielectric waveguides embedded into metal

2010-05-07

arxiv.org/abs/1005.1111v1

Appl. Phys. Lett. 97, 021106 (2010)

Physics

Optics

3 pages, 4 figures

Scientific paper

10.1063/1.3458694

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.

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