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2016 ; 6
(ä): 33380
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Extraordinary transmission of gigahertz surface acoustic waves
#MMPMID27640998
Mezil S
; Chonan K
; Otsuka PH
; Tomoda M
; Matsuda O
; Lee SH
; Wright OB
Sci Rep
2016[Sep]; 6
(ä): 33380
PMID27640998
show ga
Extraordinary transmission of waves, i.e. a transmission superior to the amount
predicted by geometrical considerations of the aperture alone, has to date only
been studied in the bulk. Here we present a new class of extraordinary
transmission for waves confined in two dimensions to a flat surface. By means of
acoustic numerical simulations in the gigahertz range, corresponding to acoustic
wavelengths ??~?3-50??m, we track the transmission of plane surface acoustic wave
fronts between two silicon blocks joined by a deeply subwavelength bridge of
variable length with or without an attached cavity. Several resonant modes of the
structure, both one- and two-dimensional in nature, lead to extraordinary
acoustic transmission, in this case with transmission efficiencies, i.e.
intensity enhancements, up to ~23 and ~8 in the two respective cases. We show how
the cavity shape and bridge size influence the extraordinary transmission
efficiency. Applications include new metamaterials and subwavelength imaging.