Ultrasonic transmission through multiple-sublattice subwavelength holes arrays

On the Role of the Geometrical Parameters in the Ultrasonic Transmission Through Plates with Subwavelength Holes Arrays

“…The transmission spectrum is the addition of the primary and secondary array spectrum. One remarkable feature if the existence of a transmission dip at 165 kHz due to a destructive interference between the holes of the primary and secondary array [16,21]. The third iteration made with holes having diameters 0.5 mm, 1.5 mm and 4.5 mm, and a unit cell period a = 13.5 mm, is depicted in Figure 12(c).…”

“…When the inter-hole distance is a/6, the amplitude reduction of the second and higher orders Fabry-Perot resonance peaks is more important, and the splitting of the first order Fabry-Perot resonance peak remains invariable. The splitting arises from the interference between holes [16,21]. When the phase difference between holes in a unit cell approaches , the interference is destructive.…”

“…When the phase difference between holes in a unit cell approaches , the interference is destructive. Whether the inter-hole distance reduces within a unit cell, the transmission spectrum will tend to become a spectrum with only one hole per unit cell [21].…”

“…The role of the geometrical parameters of the hole array is important in the ultrasonic transmission through perforated plates and has been subject of several studies [18][19][20][21][22]. The purpose of this paper is to describe and summarize theoretically the set of geometrical parameters that affect the ultrasonic transmission through subwavelength holes arrays.…”

Enhanced acoustical transmission and beaming effect through a single aperture

“…3,4 In the case of sound waves several work on both theory and experiments has been performed in order to study the acoustical analogy. [5][6][7][8][9][10][11][12] One of the main difference between holey structures for light and sound propagation is the absence of polarization for a longitudinal-acoustic wave, which always makes the lowest waveguide mode inside apertures propagative, exhibiting no cutoff. 8 Also nonopaque screens made out of sound-soft materials, which is giving rise to the coupling with structure-borne sound, make a clear statement on not to be a trivial analogy to its optical counterpart.…”