Simulation Studies on Enhanced Infrared Absorption in Dielectric Mie Metasurfaces for Bolometer Applications

초록

Metasurfaces are the arrays of subwavelength resonators that can alter the interaction of light and matter with a high degree of freedom. Dielectric metasurfaces can support Mie resonances to confine and enhance electromagnetic waves within the resonator and enhance the light-matter interaction. Additionally, they have been used for improving the efficiency of photoluminescence and harmonic generation, etc. This study theoretically investigates the enhanced infrared absorption in dielectric Mie metasurfaces. Using vanadium oxide with a high temperature coefficient of resistance and designing the structure such that the all the resonators are connected to each other, we revealed the possibility of using the metasurface to bolometers. At high order Mie resonances, the designed metasurface can absorb up to 93% of 5-μm radiation, which affords 20 times higher absorption sensitivity to infrared light than that of a bare dielectric film of the same height. Furthermore, we investigate the physical origin of such absorption enhancement with near-field distribution at the resonance and multipole analysis. © 2022 The Korean Physical Society. All rights reserved.

키워드