Coherent perfect absorption in resonant materials
Abstract
Coherent perfect absorption (CPA) is an interferometric effect that guarantees full absorption in a lossy layer independently of its intrinsic losses. To date, it has been observed only at a single wavelength or narrow bandwidths, whereupon wavelength-dependent absorption can be ignored. Here we produce CPA over a bandwidth of ~ 60 nm in a 2-um-thick polymer film with a low-doping concentration of an organic laser dye. A planar cavity is designed with a spectral `dip' to accommodate the dye resonant linewidth, and CPA is thus achieved even at its absorption edges. This approach allows realizing strong absorption in laser dyes - and resonant materials in general - independently of the intrinsic absorption levels, with a at spectral profile and without suffering absorption quenching due to high doping levels.
Cite
@article{arxiv.2011.04205,
title = {Coherent perfect absorption in resonant materials},
author = {S. Shabahang and Ali. K. Jahromi and L. N. Pye and J. D. Perlstein and M. L. Villinger and Ayman F. Abouraddy},
journal= {arXiv preprint arXiv:2011.04205},
year = {2020}
}