2015年论文发表
发布时间：2020-04-25
点击次数：
Our paper "Unidirectional reflectionless propagation in plasmonic waveguide-cavity systems at exceptional points" by Yin Huang*, Changjun Min and Georgios Veronis is accepted in Optics express.
Website: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-11-14922
Abstract: We design a non-parity-time-symmetric plasmonic waveguidecavity 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.