We introduce non-parity-time-symmetric plasmonic waveguide-cavity systems, consisting of resonators with unbalanced gain and loss side-coupled to a waveguide. We show that the design parameters of such systems can be tuned to obtain exceptional points, and realize unidirectional reflectionless light propagation. We then propose a compact perfect absorber unit cell, based on unidirectional reflectionlessness at exceptional points. We show that with proper design, light can propagate into the perfect absorber unit cell with reflection close to zero in a broad wavelength range. By cascading multiple unit cell structures, near total light absorption can be achieved in a wide range of frequencies.
G. Veronis, Y. Huang, and C. Min, "Non-PT-symmetric plasmonic waveguide-cavity systems: unidirectional reflectionlessness and broadband near total light absorption," Proc. SPIE 10345, Active Photonic Platforms IX, 103451Z (Presented at SPIE Nanoscience + Engineering: August 10, 2017; Published: 28 August 2017); https://doi.org/10.1117/12.2274698.
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