We design a non-parity-time-symmetric plasmonic waveguide-cavity system, consisting of two metal-dielectric-metal stub resonators side coupled to a metal-dielectric-metal waveguide, to form an exceptional point, and realize unidirectional reflectionless propagation at the optical communication wavelength. We also show that slow-light-enhanced ultra-compact plasmonic Mach-Zehnder interferometer sensors, in which the sensing arm consists of a waveguide system based on a plasmonic analogue of electromagnetically induced transparency, lead to an order of magnitude enhancement in the refractive index sensitivity compared to a conventional metal-dielectric-metal plasmonic waveguide sensor. Finally, we show that plasmonic coaxial waveguides offer a platform for practical implementation of plasmonic waveguide-cavity systems.
G. Veronis, Y. Huang, A. Mahigir, P. Dastmalchi, W. Shin, C. Min, and S. Fan, "Unidirectional reflectionless propagation and slow-light enhanced sensing with plasmonic waveguide-cavity systems," Proc. SPIE 9920, Active Photonic Materials VIII, 99201Y (Presented at SPIE Nanoscience + Engineering: September 01, 2016; Published: 16 September 2016); https://doi.org/10.1117/12.2238232.
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