Approaching the upper limits of the local density of states via optimized metallic cavities
Author(s)Yao, Wenjie; Benzaouia, Mohammed; Miller, Owen D.; Johnson, Steven G
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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.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Mathematics
The Optical Society
Yao, Wenjie et al. "Approaching the upper limits of the local density of states via optimized metallic cavities." Optics Express 28, 16 (July 2020): 24185-24197 © 2020 Optical Society of America
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