Density-near-zero using the acoustically induced transparency of a Fano acoustic resonator. (5th January 2017)

• Record Type: Journal Article
• Authors: Elayouch, A.; Addouche, M.; Farhat, M.; Amin, M.; Bağcı, H.; Khelif, A.
• Is Part Of: Europhysics letters. Volume 116:Number 4(2016:Nov.)
• Publication Date: 2017-01-05
• Subjects: 68.60.Bs -- 81.05.Xj -- 43.40.+s; Physics -- Periodicals; Electronic journals; 530.05
• DOI: 10.1209/0295-5075/116/46004
• Languages: English
• ISSNs: 0295-5075

Abstract

Abstract: We report experimental results of near-zero mass density involving an acoustic metamaterial supporting Fano resonance. For this, we designed and fabricated an acoustic resonator with two closely coupled modes and measured its transmission properties. Our study reveals that the phenomenon of acoustically induced transparency is accompanied by an effect of near-zero density. Indeed, the dynamic effective parameters obtained from experimental data show the presence of a frequency band where the effective mass density is close to zero, with high transmission levels reaching 0.7. Furthermore, we demonstrate that such effective parameters lead to wave guiding in a 90-degrees–bent channel. This kind of acoustic metamaterial can, therefore, give rise to acoustic functions like controlling the wavefront, which may lead to very promising applications in acoustic cloacking or imaging.