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 over narrow bandwidths, whereupon wavelength-dependent absorption can be ignored. Here we produce CPA over a bandwidth of ∼60 nm in a 2 µm 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 flat spectral profile and without suffering absorption quenching due to high doping levels.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 18, 2021
- Source ID
- 10.1088/2040-8986/abda86
Entities
People
- Ali K. Jahromi
- Ayman F Abouraddy
- Joshua D Perlstein
- Lorelle N. Pye
- Massimo L. Villinger
- Soroush Shabahang
Organizations
- Air Force Office of Scientific Research