Plasmonic reflection color filters with metallic random nanostructures

Abstract

We develop reflective color filters with randomly distributed nanodisks and nanoholes fabricated with hydrogen silsesquioxane and Ag films on silicon substrate. They exhibit high resolution, angle-independence and easily up-scalable fabrication, which are the most important factors for color filters for industrial applications. We uncover the underlying mechanism after systematically analyzing the localized surface plasmon polariton coupling in the electric-field distribution. The agreement of the experimental results with those from the simulation indicates that tunable colors across the visible spectrum can be obtained by simply varying the diameter of the nanodisks, promoting their applications.

Nanophotonic Structural Colors

“…Due to the ability to confine light into sub-wavelength dimensions, LSPR is a natural approach to generate color elements, as illustrated in Figure 2a. 7,[58][59][60][61][62][63][64][65][66][67][68][69][70][71][72] Here, the collective oscillation of free 7 electrons in metallic nanostructures is strongly coupled to external electromagnetic waves forming quasiparticles called plasmons, 73,74 leading to absorption and scattering of light at resonances that are typically several hundreds of nanometers in the wavelength range. The resonance frequency and the resulting color can be controlled by tuning the particle's shape, size, and its surrounding nano environment.…”

Ultrathin sputter-deposited plasmonic silver nanostructures

“…5(b)) results in a typical red shi of the localized surface plasmon resonance of nanodisks. 22,51,54 The change of disk array period (see Fig. 5(c)) has only a minor inuence on the dipole resonance position.…”

Wide-Gamut and Polarization-Independent Structural Color at Optical Sub-diffraction-Limit Spatial Resolution Based on Uncoupled LSPPs

“…It is known that the optical properties of periodical nanostructures are largely dependent on the distance between nanostructures, especially when the distance is relatively small. This is because the coupling effect associated with the hybridization of the dipole or higher multipolar plasmons between nanostructures lead to variations in the collective plasmon energy [26, 42, 43]. However, the coupling effect limits the pixel size, and sometimes causes the non-negligible resonant peak shift or peak split, thus leading to unexpected color generation [17].…”