Suppressing electromagnetic local density of states via slow light in lossy quasi-1d gratings
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929263675965440 |
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| author | Strekha, Benjamin Chao, Pengning Defo, Rodrick Kuate Molesky, Sean Rodriguez, Alejandro W. |
| author_facet | Strekha, Benjamin Chao, Pengning Defo, Rodrick Kuate Molesky, Sean Rodriguez, Alejandro W. |
| contents | 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 $Δω$ is impossible. Inspired by limits which predict nontrivial $\sqrt{Δω}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_15794 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Suppressing electromagnetic local density of states via slow light in lossy quasi-1d gratings Strekha, Benjamin Chao, Pengning Defo, Rodrick Kuate Molesky, Sean Rodriguez, Alejandro W. Optics Mesoscale and Nanoscale Physics 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 $Δω$ is impossible. Inspired by limits which predict nontrivial $\sqrt{Δω}$ 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. |
| title | Suppressing electromagnetic local density of states via slow light in lossy quasi-1d gratings |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2309.15794 |