Extraordinary acoustic transmission, symmetry, blaschke products and resonators

Meylan, Michael H.; Hassan, Mahmood-ul; Bashir, Amna

Title: Extraordinary acoustic transmission, symmetry, blaschke products and resonators
Creator: Meylan, Michael H.; Hassan, Mahmood-ul; Bashir, Amna
Relation: Wave Motion Vol. 74, Issue November 2017, p. 105-123
Publisher Link: http://dx.doi.org/10.1016/j.wavemoti.2017.06.007
Publisher: Elsevier
Resource Type: journal article
Date: 2017
Description: The phenomenon of extraordinary acoustic transmission (EAT) in a resonator, which has recently been investigated experimentally, is studied theoretically. It is shown that the combination of a single propagating mode and a symmetry orthogonal to the direction of propagation for a resonator leads to EAT. This is accomplished by decomposing the problem using symmetry, the Blaschke product and the properties of functions of a single complex variable which have modulus one on the real axis. The conditions of a resonator requires that the solution has singularities in the analytic extension to complex frequencies (resonances) and it is precisely near these resonances that we observe EAT. The condition of a Blaschke product requires that there is a zero at the complex conjugate of the singularity and EAT occurs when the solution on the real axis passes between these complex conjugate pairs of poles and zeros. A detailed numerical study of the problem is conducted and we show that once the single mode of propagation or the symmetry is broken then EAT (at least perfect transmission) no longer holds generally.
Subject: waveguide; resonance; extraordinary transmission; analytic extension
Identifier: http://hdl.handle.net/1959.13/1353886
Identifier: uon:31153
Identifier: ISSN:0165-2125
Language: eng
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