Experimental study of guiding and filtering of acoustic waves in a two dimensional ultrasonic crystalReport as inadecuate




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1 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies 2 LDSMM - Laboratoire de dynamique et structures des matériaux moléculaires

Abstract : We present a combined experimental and theoretical study of the guiding, bending and filtering of acoustic waves in an ultrasonic crystal. The crystal consists of a two-dimensional periodical array of steel rods immersed in water, for wich a complete acoustic band gap extending from 240 to 325 kHz is found experimentally. Waveguides for acoustic waves are further created by removing a line defect, on which stubs can be added by removing rods from the side-walls of the waveguide. Full transmission is observed for a one-period-wide straight waveguide within the full-band-gap of the perfect phononic crystal, i.e. for a waveguide aperture smaller than one acoustic wavelength. Waveguiding over a wide frequency range is also obtained for a one-period-wide waveguide with two sharp 90 bends. Finite-difference time-domain computations are found to be in good agreement with the measurements in all experimental configurations.





Author: Abdelkrim Khelif - Abdelkrim Choujaa - Sarah Benchabane - Bahram Djafari-Rouhani - Vincent Laude -

Source: https://hal.archives-ouvertes.fr/



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