ELTE IMAPS 2019 - Coupled-mode formulation by reciprocity in directional coupler based on hyperbolic metamaterials

Abstract

Hyperbolic metamaterials (HMMs) are a special class of metamaterials, characterized by extreme anisotropy and existence of high-k states. Such media are known to reveal a wide range of unique physical phenomena such as hyperlensing, subwavelength imaging and waveguiding, or spontaneous emission enhancement [1]. Recently, many scientific studies have been devoted to tunable hyperbolic metamaterials (THMMs) based on stimulus-sensitive materials, which made new functionalities possible, such as local field enhancement, plasmon propagation and slowing/stopping light, all controllable by external electric field [2, 3]. Within this work, we present an rigorous analytical approach for analysis of controlled mode coupling in directional coupler based on tunable hyperbolic metamaterial. In particular, we present straightforward expressions for coupling coefficients for various waveguide systems with medium revealing controllable dispersion.