Structural color filters with compensated angle-dependent shifts
Abstract
Structural color filters use nano-sized elements to selectively transmit incident light, offering a scalable, economical and environmentally friendly alternative to traditional pigment- and dye-based color filters. However, their structural nature makes their optical response prone to spectral shifts whenever the angle of incidence varies. We address this issue by introducing a conformal VO2 layer onto bare aluminum structural color filters. The insulator-metal transition of VO2 compensated the spectral shift of the filter's transmission at a 15{\deg} tilt with 80% efficiency. Unlike solutions that require adjustment of the filter's geometry, this method is versatile and suitable also for existing structural filters. Our findings also establish tunable materials in general as a possible solution for angle-dependent spectral shifts.
Keywords
Cite
@article{arxiv.2309.11262,
title = {Structural color filters with compensated angle-dependent shifts},
author = {Katarína Rovenská and Filip Ligmajer and Beáta Idesová and Peter Kepič and Jiří Liška and Jan Chochol and Tomáš Šikola},
journal= {arXiv preprint arXiv:2309.11262},
year = {2023}
}