基于多端口波导结构的宽频带声触发器  

Broadband acoustic triggers based on multiport waveguide structures

作　　者：庞乃琦 王垠 葛勇[1] 施斌杰 袁寿其[1] 孙宏祥[1,2] Pang Nai-Qi;Wang Yin;Ge Yong;Shi Bin-Jie;Yuan Shou-Qi;Sun Hong-Xiang(Research Center of Fluid Machinery Engineering and Technology,School of Physics and Electronic Engineering,Jiangsu University,Zhenjiang 212013,China;State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]江苏大学物理与电子工程学院,流体机械工程技术研究中心,镇江212013 [2]中国科学院声学研究所,声场声信息国家重点实验室,北京100190

出　　处：《物理学报》2023年第16期130-136,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12274183,12174159);国家重点研发计划(批准号:2020YFC1512403)资助的课题.

摘　　要：基于线性相干及相位调控机制设计制备了两类声学触发器,所设计的声学触发器由相控单元和多端口波导结构组成,其宽度与长度分别为0.32λ和0.82λ(λ为声波波长),具有亚波长结构特征.基于相控单元的相位调制及声波的线性相干机制,分别实现了T触发器和D触发器的声学逻辑功能,且相对带宽(工作带宽与工作频带的中心频率之比)分别可以达到0.23和0.22.实验测量与数值模拟的结果吻合很好.本文所提出的声触发器具有宽频带、亚波长尺寸及结构简单等特点,可为设计新型声触发器及声逻辑门提供理论方案与原理性器件.The study of acoustic information processing has attracted great attention owing to its advantages of anti-electromagnetic interference and low energy consumption.Acoustic logic device,as a fundamental component,plays an important role in designing integrated acoustic systems.In the past few years,with the rapid development of sonic crystals,acoustic metamaterials and metasurfaces,researchers have demonstrated a variety of acoustic logic gates based on different mechanisms,and have devoted their efforts to the promotion of the practical applications.The more complex acoustic triggers with broad bandwidth and subwavelength size are very important for developing integrated sound devices,but it is difficult to realize them.In this work,we design two types of acoustic triggers based on the mechanisms of linear interference and phase modulation.The acoustic trigger with a width of 0.32l and length of 0.82l is composed of phased unit cells and multi-port waveguide structures,showing a subwavelength structure.Based on the phase modulation of the phased unit cells and the mechanism of linear interferences,the acoustic T-type trigger and D-type trigger with the same threshold are designed and demonstrated experimentally.The corresponding working bands of the T-type and D-type triggers are 3.293-4.069 kHz and 3.400-4.138 kHz,and their fractional bandwidths(the ratio of the bandwidth to the center frequency)can reach about 0.23 and 0.22,respectively,showing a broadband characteristic of both triggers.The mechanism of the T-type trigger is attributed to the linear interference caused by two phased unit cells with a phase difference ofπ.However,the realization of the D-type trigger is closely related to the incident sound energy and the phase modulation caused by the phased unit cell in the control port.The measured results and simulated results agree well with each other.Compared with other types of acoustic logic devices,the designed acoustic triggers have the advantages of broad bandwidth,subwavelength size,same threshold

关 键 词：声超构材料 声触发器 相位调制 线性相干 波导 

分 类 号：TN64[电子电信—电路与系统]