Mid-IR High-index Dielectric Huygens' Metasurfaces

TitleMid-IR High-index Dielectric Huygens' Metasurfaces
Publication TypeBook Chapter
Year of Publication2016
AuthorsDing, J, Zhang, L, Ren, H, Zhou, M, Lin, Y, Hu, J, Zhang, H
EditorWitzigmann, B, Osinski, M, Arakawa, Y
Book TitlePhysics and Simulation of Optoelectronic Devices Xxiv
Volume9742
PaginationUNSP - 97421I
PublisherSpie-Int Soc Optical Engineering
CityBellingham
ISBN Number978-1-62841-977-1
Keywordsdielectric resonators, efficiency, high-index material, Huygens' metasurface, metamaterials, mid-IR, phase discontinuities, reflection, refraction, surfaces
Abstract

In this paper, we proposed highly efficient all-dielectric Huygens' metasurfaces working at mid-IR frequencies. The meta-atom of the designed Huygens' metasurface is a cubic dielectric resonator or its variety, which is made from PbTe that possesses a high refractive index of around 5 at mid-IR frequencies. By overlapping spectrally both the magnetic and electric dipole modes of the high-index dielectric resonators, a full phase coverage of 2 pi and an equal-magnitude transmission could be achieved, which are essential conditions for realizing a metasurface. Two Huygens' metasurfaces for beam bending are designed with a phase change between two consecutive meta-atoms of pi/4 and pi/3, respectively. The simulation results agree well with the design theory.