Suppressing electromagnetic local density of states via slow light in lossy quasi-one-dimensional gratings

Benjamin Strekha, Pengning Chao, Rodrick Kuate Defo, Sean Molesky, Alejandro W. Rodriguez

Research output: Contribution to journalArticlepeer-review

Abstract

We propose a spectral-averaging procedure that enables the 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 nonzero 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 nonzero bandwidth Δω is impossible. Inspired by limits which predict nontrivial Δω scaling in systems with material dissipation, we show that the pseudogap edge states of quasi-one-dimensional bullseye gratings can - by simultaneously minimizing material absorption and radiation - yield arbitrarily close to perfect LDOS suppression in the limit of vanishing bandwidth.

Original languageEnglish (US)
Article numberL041501
JournalPhysical Review A
Volume109
Issue number4
DOIs
StatePublished - Apr 2024
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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