Manipulation of extraordinary acoustic transmission using cascaded both-sides-open disk resonator array

Abstract

Extraordinary acoustic transmission (EAT) through cascaded both-sides-open disk resonators (BSODRs) in a square lattice array (SLA) is investigated. A single BSODR consists of one disk cavity that is sandwiched by two tubes. These structures are realized by stacking perforated steel plates and immersing them in water. EAT is studied through single-layer, two-layer, three-layer, and four-layer BSODRs in SLAs. The EAT orders increase with increasing numbers of cascading layers. The quality factors of the highest order EAT peaks also increase with increasing numbers of cascading layers. The EAT characteristics of each structure can be predicted using a spring–mass model. A coupled spring–mass model with two oscillators is proposed. The vibration of the steel part is considered one oscillator and that of the water part of the BSODR represents the other oscillator. The model verifies that the EAT resonances are excited by coupling of the vibration from the steel plates to the water part. The experimental transmission spectra agree with the numerically simulated spectra. The EAT frequency is sensitive to the longitudinal sound velocity. Because of the increased quality factor, the figure of merit is enhanced eight times by cascading four BSODR layers. The proposed structure is suitable for acoustic filter and sensor applications.

Predicting Band Structures of Two-Dimensional Phononic Crystal Slab for Sensor Predesigning Based on Artificial Neural Network

“…(1,2) The special sound wave modulation ability enables good design of phononic crystals for sensing. (3,4) Before using the phononic resonator to design specific sensors, the fundamental characteristics of the phononic crystals should first be investigated. The elastic moduli include mass density and elastic coefficient.…”

Acoustic extraordinary transmission based on near-zero-index metamaterials

“…Based on proximity effects, Tao et al 13) designed an acoustic heterojunction to obtain a high transmission efficiency. Lee et al 14) constructed an array of both sides-open disk resonators and achieved a low-frequency extraordinary transmission in water. Devaux et al 15) proposed a resonant meta-atom and demonstrated that sound waves can be squeezed through a nanoscale channel, which showed extraordinary transmission.…”