Open AccessHighly reflective optical nanocavities for structural coloration by combining broadband absorber and Fabry–Pérot effects
Author(s) -
Stefano Rossi,
Magnus P. Jonsson
Publication year - 2020
Publication title -
journal of optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 95
eISSN - 2040-8986
pISSN - 2040-8978
DOI - 10.1088/2040-8986/abccfe
Subject(s) - chromaticity , structural coloration , broadband , fabry–pérot interferometer , optics , materials science , optoelectronics , reflectivity , coating , optical coating , layer (electronics) , visible spectrum , nanotechnology , physics , photonic crystal , wavelength
Reflective structural colors are of interest for many applications as alternatives to dyes and pigments and many different solutions have been proposed. The ideal systems should provide high reflectance efficiency while keeping good chromaticity and offering tunability throughout the visible spectral range. It is challenging to achieve such combined features with a simple single structure. Here we address this challenge using a concept that combines the Fabry–Pérot effect with a broadband absorbing layer. Our easy-to-fabricate structures form highly reflective optical nanocavities with improved chromaticity throughout the visible compared with the two separate concepts. The addition of an additional cavity layer and a transparent top coating further improves the chromaticity and allows the formation of black surfaces.