Research on Local Sound Field Control Technology Based on Acoustic Metamaterial Triode Structure

Abstract

Cell photoacoustic detection faces the problem where the strength of the sound wave signal is so weak that it easily gets interfered by other acoustic signals. A sonic triode model based on an artificial periodic structure is designed by COMSOL Multiphysics 5.3a software (Stockholm, Sweden), and software simulations are conducted. Experiments show that when a sound wave with a specific frequency is input by the sound wave triode, it can produce an energy amplification effect on the sound wave signals of the same frequency and a blocking effect on the sound wave signals of other frequencies. This contrast effect is more obvious after increasing the sound pressure intensity of the input sound wave signal. It can effectively filter out interference sound signals. The study of the acoustic triode model provides a new approach for the acquisition and identification of acoustic signals in cell photoacoustic detection, which can significantly improve the working efficiency and accuracy of cell photoacoustic detection.

Broadband acoustic signal enhancement via gradient metamaterials coupled to crystals

“…However, the frequency bandwidth of the acoustic signal captured by each slit is reduced, and the frequency band blind area between the gaps of the gradient structure is increased, making it less suitable for practical engineering applications. Furthermore, we discovered that high refractive index media features can be constructed using subwavelength phononic crystal (PC) arrays [31,32]. Nejad [33] created an acoustic fiber with a higher refractive index than uniform air using cross-shaped phononic crystals.…”