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In recent years, particular physical phenomena enabled by non-Hermitianmetamaterial systems have attracted significant research interests. In thispaper, a non-Hermitian three-dimensional metamaterial near the exceptionalpoint (EP) is proposed to demonstrate extremely asymmetric absorption andreflection. Unlike its conventional counterparts, this proposed metamaterial isconstructed with a loss-assisted design. Localized losses are introduced intothe structure by combining our technique of graphene-based resistive inks withconventional printed circuit board (PCB) process. Extremely asymmetricabsorption and reflection near the EP are experimentally observed by tuning theloss between split ring resonators (SRRs) in the meta-atoms. Simultaneously, bylinking the equivalent circuit model (ECM) with the Hamiltonian quantumphysical model, the equivalent non-Hermitian Hamiltonian is obtained and anon-Hermitian transmission matrix is constructed. We show that tuning thestructure and circuit parameters of the ECM produces a metamaterial system withEP response. Our system can be used in the design of asymmetric metamaterialabsorbers. Our work lays down the way for the manipulation of EP to developperfect absorption, sensing and other applications in the 3D metamaterialplatform.

Extremely asymmetric absorption and reflection near the exceptional point of three-dimensional metamaterial