1 March 2016 Unidirectional reflectionless propagation in plasmonic waveguide-cavity devices
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Recently, unidirectional reflectionlessness was demonstrated in classical photonic structures at optical exceptional points. Here we introduce a non-parity-time symmetric plasmonic waveguide-cavity device consisting of two metaldielectric- metal stub resonators side coupled to a metal-dielectric-metal waveguide. We tune the geometric parameters of the structure to obtain the exceptional point and realize unidirectional reflectionlessness at the optical communication wavelength. We investigate the properties of the plasmonic exceptional point as well as the associated physical effects of level repulsion, crossing and phase transition. We also show that by properly cascading the plasmonic waveguide-cavity structures we can design a wavelength-scale unidirectional plasmonic waveguide perfect absorber.
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Y. Huang, Y. Huang, G. Veronis, G. Veronis, C. Min, C. Min, } "Unidirectional reflectionless propagation in plasmonic waveguide-cavity devices", Proc. SPIE 9750, Integrated Optics: Devices, Materials, and Technologies XX, 97500G (1 March 2016); doi: 10.1117/12.2213784; https://doi.org/10.1117/12.2213784

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