Approaching the upper limits of the local density of states via optimized metallic cavities
Abstract
By computational optimization of air-void cavities in metallic substrates, we show that the local density of states (LDOS) can reach within a factor of ≈10 of recent theoretical upper limits and within a factor ≈4 for the single-polarization LDOS, demonstrating that the theoretical limits are nearly attainable. Optimizing the total LDOS results in a spontaneous symmetry breaking where it is preferable to couple to a specific polarization. Moreover, simple shapes such as optimized cylinders attain nearly the performance of complicated many-parameter optima, suggesting that only one or two key parameters matter in order to approach the theoretical LDOS bounds for metallic resonators.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 31, 2020
- Source ID
- 10.1364/oe.397502
Entities
People
- Mohammed Benzaouia
- Owen Miller
- Steven G. Johnson
- Wenjie Yao
Organizations
- Air Force Office of Scientific Research
- Army Research Office
- Defense Advanced Research Projects Agency