Journal
OPTICS EXPRESS
Volume 23, Issue 23, Pages 29882-29895Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.029882
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Funding
- Postdoctoral Research Foundation of CSU
- National Science Foundation [1102301, 1254934]
- National Natural Science Foundation of China [61422506, 11204141]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1102301, 1254934] Funding Source: National Science Foundation
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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. The contrast ratio between the forward and backward reflection almost reaches unity. We show that the presence of material loss in the metal is critical for the realization of the unidirectional reflectionlessness in this plasmonic system. We investigate the realized exceptional point, as well as the associated physical effects of level repulsion, crossing and phase transition. We also show that, by periodically cascading the unidirectional reflectionless plasmonic waveguide-cavity system, we can design a wavelength-scale unidirectional plasmonic waveguide perfect absorber. Our results could be potentially important for developing a new generation of highly compact unidirectional integrated nanoplasmonic devices. (C) 2015 Optical Society of America
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