TITLE

Acoustical mechanism for the extraordinary sound transmission through subwavelength apertures

AUTHOR(S)
Xinlong Wang
PUB. DATE
March 2010
SOURCE
Applied Physics Letters;3/29/2010, Vol. 96 Issue 13, p134104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An acoustical theory is developed for sound transmitting through subwavelength apertures. We show that the excitation of evanescent high-order modes induces, on each end of an aperture (either a slit or a hole), an additional acoustical reactance, which is singular as incident wavelength approaches one of cutoff wavelengths of high modes. The anomaly of the induced reactance greatly changes the resonant behaviors of the aperture, and makes the conjugate impedance matching possible at a wavelength slightly longer than the cutoff, thus leading to the extraordinary full transmission.
ACCESSION #
48943871

 

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