Additive and Subtractive Color Filters Based on Birefringent Dielectric Metasurfaces
Abstract
Dielectric metasurfaces offer a path to high-efficiency optical components at the sub-wavelength scale. In this work, we utilize the wavelength-dependent birefringence of TiO2 nanopillars to create transmissive color filters with switchable spectral responses. We demonstrate that the same physical nanostructure array can function as either an additive (band-pass) or a subtractive (band-stop) filter solely by rotating an external polarizer. The metasurface was fabricated via a modified damascene process, enabling high-aspect-ratio structures with spatial resolutions down to 250 nm. The filters achieve transmission efficiencies of 70% tailorable across the entire visible spectrum, avoiding the ohmic losses typical of plasmonic alternatives. This approach provides a tunable, high-efficiency platform offering a versatile and compact solution for next-generation high-resolution imaging systems.
Cite
@article{arxiv.2605.25881,
title = {Additive and Subtractive Color Filters Based on Birefringent Dielectric Metasurfaces},
author = {Ondřej Červinka and Filip Ligmajer and Ondřej Brunn and Miroslav Horáček and Stanislav Krátký and Tomáš Šikola},
journal= {arXiv preprint arXiv:2605.25881},
year = {2026}
}
Comments
12 pages, 5 figures