Broadband and energy-concentrating terahertz coherent perfect absorber based on a self-complementary metasurface

Abstract

We demonstrate that a self-complementary checkerboard-like metasurface works as a broadband coherent perfect absorber (CPA) when symmetrically illuminated by two counter-propagating incident waves. A theoretical analysis based on wave interference and results of numerical simulations of the proposed metasurface are provided. In addition, we experimentally demonstrate the proposed CPA in the terahertz regime by using a time-domain spectroscopy technique. We observe that the metasurface can work as a CPA below its lowest diffraction frequency. The size of the absorptive areas of the proposed CPA can be much smaller than the incident wavelength. Unlike conventional CPAs, the presented one simultaneously achieves the broadband operation and energy concentration of electromagnetic waves at the deep-subwavelength scale.

5 pages, 4 figures

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• Surface waves on self-complementary metasurfaces: intrinsic hyperbolicity, dual-directional canalization and TE-TM polarization degeneracy
• Quasi-Babinet principle in dielectric resonators and Mie voids
• Excitation of Surface Waves with On-Demand Polarization at Self-Complementary Metasurface
• Energy loss of terahertz electromagnetic waves by nano-sized connections in near-self-complementary metallic checkerboard patterns
• Chiral phase modulation and tunable broadband perfect absorber using the coherent cold atomic ensemble
• Departure from Babinet principle in metasurfaces supported by subwavelength dielectric slabs