基于压电声子晶体板波声场的微粒操控  

Acoustic manipulation of microparticles using a piezoelectric phononic crystal plate

作　　者：王俊 蔡飞燕[2,3] 张汝钧[2] 李永川 周伟 李飞[2,3] 邓科[1] 郑海荣[2,3] Wang Jun;Cai Fei-Yan;Zhang Ru-Jun;Li Yong-Chuan;Zhou Wei;Li Fei;Deng Ke;Zheng Hai-Rong(Department of Physics,Jishou University,Jishou 416000,China;Paul C.Lauterbur Research Center for Biomedical Imaging,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China;Key Laboratory of Biomedical Imaging Science and System,Chinese Academy of Sciences,Shenzhen 518055,China)

机构地区：[1]吉首大学物理系,吉首416000 [2]中国科学院深圳先进技术研究院,劳特伯生物医学成像研究中心,深圳518055 [3]医学成像科学与技术系统中国科学院重点实验室,深圳518055

出　　处：《物理学报》2024年第7期218-223,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11974372,12004409,11964011,12074402);深圳市科技计划(批准号:RCJC20221008092808013,JCYJ20200109105823170,JCYJ20200109110006136)资助的课题.

摘　　要：声镊可以非接触、无损伤地操控微粒,在细胞分离、组织工程、材料组装等领域具有广阔的应用前景.近期有研究利用声人工结构调控声场提升声镊性能,然而,与换能器分离的人工结构导致声镊装置复杂且操控现象不太稳定.本文基于压电声子晶体板调制声场实现对微粒的灵活操控,其主要机制是由压电陶瓷片构成的压电声子晶体板可激发A0模式Lamb波模式和共振周期声场模式,板上微粒在这两个模式中分别受到平行于板面的声停驻力和垂直于板面的声捕获力或声悬浮力,从而实现排列、捕获、悬浮等多种模式的灵活操控.由于压电声子晶体板整合了换能器与声人工结构,该器件为研究高精度、低能耗、紧凑型声镊技术提供了物理基础和实验验证.Acoustic tweezer is a promising device for manipulating particles,which does not need contact does not cause damage,or requires transparent materials.They have diverse applications in cell separation,tissue engineering,and material assembly.To control particle movement,this technology relies on the exchange of momentum between the particle and the acoustic field,generating an acoustic radiation force.Achieving highperformance acoustic tweezers necessitates the precise shaping of the acoustic fields.Traditionally,there are mainly two types of acoustic tweezers:bulk acoustic wave(BAW)and surface acoustic wave(SAW).The SAW-based acoustic tweezer operates at high frequencies,realizing precise manipulation.The BAW-based acoustic tweezer operates at lower frequencies and requires artificial structure on the transducer surface to shape the field.However,the separation of the artificial structure from the transducer brings complexity and instability into the manipulation process.In this study,we propose a novel approach to overcoming these challenges,that is,using piezoelectric phononic crystal plates to integrate the transducer and acoustic artificial structure.By designing the thickness,periodicity,and electrode width of the piezoelectric phononic crystal plate,we can excite the A0 Lamb wave mode and the periodic resonant mode,resulting in a periodic gradient field and a periodic weak gradient field,respectively.These fields enable particle to be trapped or levitated on the surface.To validate this approach,an experimental device is constructed,and successful particle manipulation is achieved by using Lamb wave mode or periodic resonant mode through using the piezoelectric phononic crystal plate.This technological breakthrough serves as a crucial foundation and experimental validation for developing the compact,low-energy and high-precision acoustic tweezers.

关 键 词：压电声子晶体 声辐射力 声镊 微粒操控 

分 类 号：O735[理学—晶体学]