Dual-band unidirectional reflectionless phenomenon based on high-order plasmon resonators in plasmonic waveguide system

Abstract

We investigate the dual-band unidirectional reflectionless phenomenon and near perfect absorption using high-order plasmon resonators at exceptional points based on near-field coupling in plasmonic waveguide system. The system consists of two high-order plasmon resonators end-coupled to a metal-insulator-metal plasmonic waveguide. The reflection for forward (backward) direction is close to 0.85 (0.74), while for backward (forward) direction is approximate to 0 (0) at a frequency of 199.8[Formula: see text]THz (206.1[Formula: see text]THz), and the quality factor of absorption spectrum is about 257.6 (217.2) at 206.1[Formula: see text]THz (199.8[Formula: see text]THz) for forward (backward) direction.

A versatile meta-device for linearly polarized waves in terahertz region

“…Metamaterials [11,12]are artificially constructed subwavelength scale meta-atoms designed to exhibit plenty of properties, such as electromagnetically induced transparency [13][14][15][16], polarization conversion for electromagnetic wave [10,[17][18][19][20][21][22][23], electromagnetic cloaking [24][25][26], negative refraction [27,28], wavefront manipulation [29][30][31], unidirectional reflectionlessness (UR) [32][33][34][35][36][37][38], asymmetric transmission (AT) [39][40][41][42][43][44][45][46][47][48][49], and more. As an analog of diode effect, UR refers to the ability to completely reflect light from one side of structure while virtually eliminate it from the other side.…”