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Metal-semiconductor-oxide extreme hyperbolic metamaterials for selectable canalization wavelength

Hyperbolic metamaterials (HMMs) are artificial structures whose extreme optical anisotropy opens the way for a broad range of applications in the visible range, from perfect lensing to attomolar biosensing. In this work we investigate the possibility of realizing an HMM structure presenting a dielectric singularity in the anisotropic permittivity response. A transition point of inverted but coexisting anisotropies is obtained at a specified wavelength due to the particular design of the multilayer meta-structure, possessing different optical properties depending on the investigation frequency. Once properly designed for only a few metal-dielectric pairs in the visible range, there is no way to shift the transition wavelength between these coexisting anisotropies and keep the same constituents. We present a simple way of overcoming this problem and set up a method to tune this transition point within almost the entire visible range without changing the constituent fundamental materials.