A visible and near-infrared broadband light absorber of cone-shaped metallic cavities
Abstract
Metal-coated moth-eye films display broadband light-absorption (BLA) over the visible (380-780 nm) and near-infrared (780-1000 nm) spectral ranges when illuminated from the rear. The pillars on the moth-eye film function as a template of cone-shaped metallic cavities. The average absorptance is 91% over the visible wavelength range. Calculations based on the finite-difference time-domain method revealed that the high absorptance is due to effective capturing of illuminating light in the cone-shaped metallic cavities. This BLA metamaterial, with dimensions larger than 1 cm2 and fabricated without using any nanofabrication technique, is useful for photonics applications involving, e.g. light-harvesting and light-emission.
- Publication:
-
Applied Physics Express
- Pub Date:
- June 2020
- DOI:
- 10.35848/1882-0786/ab8964
- Bibcode:
- 2020APExp..13f2001N
- Keywords:
-
- metamaterials;
- moth-eye film;
- light absorber;
- surface plasmons;
- black-body