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PreprintarXiv licencearXiv

Gearbox cavities: Ultrahigh wave confinement via broken rotational symmetry

  • Alessio Amaolo
  • Sean Molesky
  • Alejandro W. Rodriguez
  • George Shaker
  • Steven G. Johnson
  • Pengning Chao
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Abstract

Cavity enhancement of emission from a point source typically relies on structures that preserve its cylindrical symmetry, such as circular Bragg gratings. Combining inverse design with fundamental limits, we show that breaking this symmetry is necessary to maximize the local density of states in lossless two-dimensional cavities. Symmetry-broken designs exceed limits over all cylindrically symmetric structures by up to eight orders of magnitude, acting as ``gearboxes'' that convert the source's emission into high-angular-momentum waves trapped behind a centrifugal barrier.

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Cite

BibTeXRIS
BibTeX
@misc{amaolo2026gearbox,
  title = {{Gearbox cavities: Ultrahigh wave confinement via broken rotational symmetry}},
  author = {Alessio Amaolo and Sean Molesky and Alejandro W. Rodriguez and George Shaker and Steven G. Johnson and Pengning Chao},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.42003},
  eprint = {2610.42003},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.42003},
}
RIS
TY  - UNPB
TI  - Gearbox cavities: Ultrahigh wave confinement via broken rotational symmetry
AU  - Alessio Amaolo
AU  - Sean Molesky
AU  - Alejandro W. Rodriguez
AU  - George Shaker
AU  - Steven G. Johnson
AU  - Pengning Chao
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2610.42003
UR  - https://arxiv.org/abs/2610.42003
AB  - Cavity enhancement of emission from a point source typically relies on structures that preserve its cylindrical symmetry, such as circular Bragg gratings. Combining inverse design with fundamental limits, we show that breaking this symmetry is necessary to maximize the local density of states in lossless two-dimensional cavities. Symmetry-broken designs exceed limits over all cylindrically symmetric structures by up to eight orders of magnitude, acting as ``gearboxes'' that convert the source's emission into high-angular-momentum waves trapped behind a centrifugal barrier.
ER  -