Temporal switching to extend the bandwidth of thin absorbers
Abstract
Wave absorption in time-invariant, passive thin films is fundamentally limited by a trade-off between bandwidth and overall thickness. In this work, we investigate the use of temporal switching to reduce signal reflections from a thin grounded slab over broader bandwidths. We extend quasi-normal mode theory to time switching, developing an ab initio formalism that can model a broad class of time-switched structures. Our formalism provides optimal switching strategies to maximize the bandwidth over which minimal reflection is achieved, showing promising prospects for time-switched nanophotonic and metamaterial systems to overcome the limits of time-invariant, passive structures.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 24, 2020
- Source ID
- 10.1364/optica.408399
Entities
People
- Andrea Alù
- Huanan Li
Organizations
- Air Force Office of Scientific Research
- Simons Foundation
- United States Department of Defense