Optical Properties And Process Research Of Hyperbolic Metamaterials

Hyperbolic metamaterials as one class of metamaterials exhibit unique electromagnetic response characteristics.Such metamaterials are highly anisotropic media that have hyperbolic dispersion and support propagating modes with arbitrarily large in-plane wave vectors.Hyperbolic metamaterials have unprecedented abilities for manipulating electromagnetic wave,representing unusual optical properties compared to general artificial metamaterials.In this paper,we thoroughly explore the unique properties of hyperbolic metamaterials,and combine numerical simulation with experimental process techniques to study three kinds of physical models of hyperbolic metamaterials,namely nanowire arrays,natural hyperbolic hexagonal boron nitride and the multilayer metal–dielectric structures and apply them to refractive index sensing,resonant modes modulation and polarization control of electromagnetic wave.The main research contents are as follows:(1)We simulate the proposed gold nanowire arrays for hyperbolic metamaterials sensing in the attenuated total internal reflection geometry,analyzing the influence of different structural parameters on the guided modes and clarifying the preparation process parameters.Then we study the preparation process of gold nanowire arrays of hyperbolic metamaterials in detail.The prepared gold nanowire arrays achieve theoretical design requirements and show the perfect arrangement and appearance compared with previous process.Finally,we set up a reflective spectral test system for metamaterial from visible to near-infrared region.(2)We study the optical properties of the hexagonal boron nitride arrays.The hexagonal boron nitride contains two types of hyperbolic dispersion in the mid-infrared region.We numerically investigated the effect of the polarization together with the incident angle of the probe light on the transmission spectra of metamaterials and the amplitude of the resonance can be actively modulated via altering excitation conditions.(3)We propose a polarization control system based on graphene/dielectric multilayer stacking arrays.Utilizing the extreme anisotropy of hyperbolic media we achieve a high extinction ratio polarizer and efficient polarization control.And the operating frequency can be flexibly adjusted by designing the geometry and the Fermi level of graphene,providing a good avenue for integration of device in the infrared.