(Poster) Generalized Design of Anisotropic Metamaterial Microlens

Abstract

Metamaterial with designed optical properties can manipulate light flow in a desired way. Particularly, the focused light spot size can become deep-sub-wavelength scale in metamaterials, and it could be used in optical imaging and energy applications. Metamaterials, in general, may have high degree of anisotropy, however, the study on general lens design principles has been mainly focused on isotropic material cases except for hyperbolic and elliptical dispersion metamaterials. In this study, we utilize a generalized approach for deriving lens shape equation for arbitrary anisotropic media. The light propagation and focusing with anisotropic material lens and metamaterial lens was verified by finite-difference time-domain simulations. The degree of anisotropy and the magnitude of refractive index determine focused spot size and Rayleigh length of focused beam. Interestingly, anisotropic material lens can reduce surface reflection and maintain sub-wavelength focused spot size better than isotropic high index material lens.