Gradient spectral filtering using array of engineered silicon Mie-resonators

Jaehyuck Jang; Junsuk Rho

doi:10.1117/12.2567087

20 August 2020 Gradient spectral filtering using array of engineered silicon Mie-resonators

Jaehyuck Jang, Junsuk Rho

Proceedings Volume 11460, Metamaterials, Metadevices, and Metasystems 2020; 1146024 (2020) https://doi.org/10.1117/12.2567087
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Conference Poster

Abstract

We investigated amplified scattering of low-index Mie-resonators using guided-mode resonance from lattice. The diffracted light into first order is coupled to the lattice, thereby boosting the scattering of gallium nitride (GaN) nanopillars. This momentum matching condition is bounded by refractive index of substrate and effective refractive index of the GaN pillars. The effective refractive index is determined by the filling ratio of the GaN pillar inside a specific periodicity of unit cell. By changing the filling ratio, we were able to control cut-off frequency of coupling and the amplification of scattering. We designed spectral filters composed of array of GaN nanopillars, and amplitude of filtered light is decreased as the filling ratio is decreased. This special features enable to produce full and gradient structural colors; we successfully demonstrate micropirnts colored by red, green and blue in gradient.

Citation Download Citation

Jaehyuck Jang and Junsuk Rho "Gradient spectral filtering using array of engineered silicon Mie-resonators", Proc. SPIE 11460, Metamaterials, Metadevices, and Metasystems 2020, 1146024 (20 August 2020); https://doi.org/10.1117/12.2567087

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