Switchable acoustic projection displays based on coding composite structures

Frontiers in Physics

Physics

Jianning Han¹  Rui Wang² 

[1] School of Information and Communication Engineering, North University of China, Taiyuan, Shanxi, China;null;

关键词: composite structure;    coiling-up cavity;    switchable projection;    coherent superposition;    artificial structure;   

DOI  :  10.3389/fphy.2023.1191108

 received in 2023-03-21, accepted in 2023-04-13,  发布年份 2023

来源: Frontiers

【 摘 要 】

Projection display is of relevance for various applications, for example, information communication, encryption and storage. Although numerous optical projection devices have been reported in past years, the realization of switchable acoustic projection display without built-in circuits is a challenge. In this work, we propose a coding composite structure composed of a perforated plate and a coiling-up cavity with six interdigital rigid walls to achieve switchable acoustic projection displays. The configuration can be served as bits ‘0’ and ‘1’ by using forward and backward placements, respectively. The required projection can be displayed as long as the expected image regions are filled with bit ‘1’ and other regions are filled with bit ‘0’. By switching control wave Pc, the projected image is able to be switched from ‘Off state’ to ‘On state’ accordingly. The underlying physical mechanism is the different scattering responses between two coding bits induced by coherent superposition. Our design provides an effective solution for the construction of acoustic projection displays with switchable feature, which may have potential applications in information encryption and storage.

【 授权许可】

Unknown   
Copyright © 2023 Han and Wang.