Suppressing electromagnetic local density of states via slow light in lossy quasi-1d gratings

We propose a spectral-averaging procedure that enables computation of bandwidth-integrated local density of states (LDOS) from a single scattering calculation, and exploit it to investigate the minimum extinction achievable from dipolar sources over finite bandwidths in structured media. Structure-a...

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Bibliographic Details
Published inarXiv.org
Main Authors Strekha, Benjamin, Chao, Pengning, Rodrick Kuate Defo, Molesky, Sean, Rodriguez, Alejandro W
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.03.2024
Subjects
Density of states
Extinction
Gratings (spectra)
Material absorption
Materials selection
Scaling laws
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Summary:We propose a spectral-averaging procedure that enables computation of bandwidth-integrated local density of states (LDOS) from a single scattering calculation, and exploit it to investigate the minimum extinction achievable from dipolar sources over finite bandwidths in structured media. Structure-agnostic extinction bounds are derived, providing analytical insights into scaling laws and fundamental design tradeoffs with implications to bandwidth and material selection. We find that perfect LDOS suppression over a finite bandwidth \(\Delta\omega\) is impossible. Inspired by limits which predict nontrivial \(\sqrt{\Delta\omega}\) scaling in systems with material dissipation, we show that pseudogap edge states of quasi-1d bullseye gratings can -- by simultaneously minimizing material absorption and radiation -- yield arbitrarily close to perfect LDOS suppression in the limit of vanishing bandwidth.
ISSN:2331-8422