Qin Xianming, Chen Xuan, Yang Qiqi, Yang Lei, Liu Yan, Zhang Chuanyu, Wei Xueyong, Wang Weidong
School of Mechano-Electronic Engineering, Xidian University, Xi'an 710071, China.
CityU-Xidian Joint Laboratory of Micro/Nano-Manufacturing, Xi'an 710071, China.
Micromachines (Basel). 2023 Apr 26;14(5):943. doi: 10.3390/mi14050943.
This paper describes and analyzes a common acousto-optic phenomenon in surface acoustic wave (SAW) microfluidic chips and accomplishes some imaging experiments based on these analyses. This phenomenon in acoustofluidic chips includes the appearance of bright and dark stripes and image distortion. This article analyzes the three-dimensional acoustic pressure field and refractive index field distribution induced by focused acoustic fields and completes an analysis of the light path in an uneven refractive index medium. Based on the analysis of microfluidic devices, a SAW device based on a solid medium is further proposed. This MEMS SAW device can refocus the light beam and adjust the sharpness of the micrograph. The focal length can be controlled by changing the voltage. Moreover, the chip is also proven to be capable of forming a refractive index field in scattering media, such as tissue phantom and pig subcutaneous fat layer. This chip has the potential to be used as a planar microscale optical component that is easy to integrate and further optimize and provides a new concept about tunable imaging devices that can be attached directly to the skin or tissue.
本文描述并分析了表面声波（SAW）微流控芯片中一种常见的声光现象，并基于这些分析完成了一些成像实验。声流控芯片中的这种现象包括明暗条纹的出现和图像失真。本文分析了聚焦声场引起的三维声压场和折射率场分布，并完成了对不均匀折射率介质中光路的分析。基于对微流控器件的分析，进一步提出了一种基于固体介质的SAW器件。这种MEMS SAW器件可以使光束重新聚焦并调整显微照片的清晰度。焦距可以通过改变电压来控制。此外，该芯片还被证明能够在散射介质中形成折射率场，如组织仿体和猪皮下脂肪层。该芯片有潜力用作易于集成和进一步优化的平面微尺度光学元件，并为可直接附着于皮肤或组织的可调谐成像设备提供了一个新概念。
