University General - Research Publications

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Mid-infrared Magnetic Mirror Based on a Hybrid Metal/Dielectric Metasurface

Ye, M ; Li, S ; Gao, Y ; Shrestha, VR ; Crozier, KB (IEEE, 2018)

We propose a hybrid metal/dielectric metasurface that functions as a mid-infrared magnetic mirror. It consists amorphous silicon cuboids on gold. The physical mechanism is explained by image theory. Measured reflection spectra agree with simulations.
Generalized Method of Images and Reflective Color Generation from Ultrathin Multipole Resonators

Li, S-Q ; Song, W ; Ye, M ; Crozier, KB (AMER CHEMICAL SOC, 2018-06-01)

The multipole expansion has found limited applicability for optical dielectric resonators in inhomogeneous environment, such as on the surface of substrates. Here, we generalize the method of images to multipole analysis for light scattering by dielectric nanoparticles on conductive substrates. We present examples illustrating the physical insight provided by our method, including selection rules governing the excitation of the multipoles. We propose and experimentally demonstrate a new mechanism to generate high resolution surface color. The dielectric resonators employed are very thin (less than 50 nm), i.e., similar in thickness to the plasmonic resonators that are currently being investigated for structural color. The generalized method of images opens up new prospects for design and analysis of metasurfaces and optical dielectric resonators.