4 March 2016 Mid-IR high-index dielectric Huygens metasurfaces
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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 2π 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 π/4 and π/3, respectively. The simulation results agree well with the design theory.
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Jun Ding, Jun Ding, Li Zhang, Li Zhang, Han Ren, Han Ren, Mi Zhou, Mi Zhou, Yuankun Lin, Yuankun Lin, Juejun Hu, Juejun Hu, Hualiang Zhang, Hualiang Zhang, "Mid-IR high-index dielectric Huygens metasurfaces", Proc. SPIE 9742, Physics and Simulation of Optoelectronic Devices XXIV, 97421I (4 March 2016); doi: 10.1117/12.2212883; https://doi.org/10.1117/12.2212883

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