Enhancing monochromatic multipole emission by a subwavelength enclosure of degenerate Mie resonances

Jiajun Zhao, Likun Zhang, Ying Wu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Sound emission is inefficient at low frequencies as limited by source size. This letter presents enhancing emission of monochromatic monopole and multipole sources by enclosing the source with a subwavelength circular enclosure filled of an anisotropic material of a low radial sound speed. The anisotropy is associated with an infinite tangential density along the azimuth. Numerical simulations show that emission gain is produced at frequencies surrounding degenerate Mie resonant frequencies of the enclosure, and meanwhile the radiation directivity pattern is well preserved. The degeneracy is theoretically analyzed. A realization of the material is suggested by using a space-coiling structure.
Original languageEnglish (US)
Pages (from-to)EL24-EL29
Number of pages1
JournalThe Journal of the Acoustical Society of America
Volume142
Issue number1
DOIs
StatePublished - Jul 6 2017

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