Supercavity mode in a single metallic resonator

Rasmus E. Jacobsen, Samel Arslanagić*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Bound states in the continuum are exotic nonradiating modes with very high quality factors enabling enhanced wave-matter interactions. While they typically require array-type of systems, versions of such states have been reported in single dielectric resonators, giving rise to suppressed scattering states termed supercavity modes. In this work, we experimentally demonstrate a supercavity mode in an all-metallic resonator open for probing by free-space microwaves. Our design exploits careful tailoring of the boundaries around the resonator, which supports an octupole mode fostering a significant increase in the quality factor. The main advantage of the resonator is its simplicity and robustness, and it may be utilized as a stand-alone unit for energy harvesting and sensing or as an element for advanced functional material designs.
Original languageEnglish
Article number221701
JournalApplied Physics Letters
Volume123
Issue number22
Number of pages6
ISSN0003-6951
DOIs
Publication statusPublished - 2023

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