基于非直观光波参数光折变晶体干涉测量的物质结构及声场多维超分辨动态成像

项目名称： 基于非直观光波参数光折变晶体干涉测量的物质结构及声场多维超分辨动态成像

项目编号： No.61501239

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 熊吉川

作者单位： 南京理工大学

项目金额： 20万元

中文摘要： 在现代工程及科学研究中，各种纳米尺度物质结构和形貌的检测主要依赖于扫描隧道显微镜和原子力探针等工具，存在检测效率低、适应性差、价格昂贵等问题，且无法检测样品的高速动态响应，如表面声场特性。传统光学干涉技术能对样品声场高速位移实现纵向亚纳米级动态测量，但其横向分辨率则受衍射极限限制。光波非直观参数超显微成像技术能实现对物质结构的横向超分辨成像，却只能测量静态特征。申请人在前期工作中利用光折变晶体干涉技术成功实现了样品声场的宽视场动态成像，获得的动态图像时间分辨率达到纳秒量级。本项目通过对光波多维非直观物理量的模式化调制、光折变晶体干涉测量和信号反演，打破衍射极限，提高横向分辨率。将纳米尺度物质结构形貌的检测技术从二维静止成像拓展到多维动态成像，为纳米尺度物质结构及声场的多维动态超分辨成像提供新的理论模型和实验技术。推动深入理解光波与物质结构，光波与声场和声场与物质结构的相互作用和耦合机理。

中文关键词： 光学非直观显微成像；光折变晶体干涉；纳米物质结构；超声声场；多维动态超分辨成像

英文摘要： In modern engineering and scientific research, instruments such as scanning tunnel microscope (STM) and atomic force microscopy (AFM) are the main tools for the investigation of nano-scale structures and profiles of materials, these systems are often lack of testing and cost efficiency and adaptability. Moreover, they cannot investigate the dynamic response of samples in high speed motions, such as the surface sound field. Conventional optical interferometry techniques can achieve sub-nanometer resolutions in measuring displacements of sample surfaces in the direction of the motion, while its lateral resolution can only reach a few hundred nanometers due to the optical diffraction limit. The super-resolution vector parameter indirect microscopic imaging technique is able to obtain images with lateral resolutions beyond the diffraction limit, while only for static structures. In previous work of the applicants, full-field dynamic visualization of surface sound fields was achieved by photorefractive interferometry, with temporal resolution up to nanoseconds. In the present project, we are planning to break the diffraction limit and improve the lateral resolution of dynamic images of the surface structure and sound field, by modulating, photorefractive interferometry measuring and analyze the information carried by multiple indirect vector parameters of the optical wave. Static 2D imaging of nano-scale structures of current techniques will be extended to 3D dynmaic imaging. This new technique is able to obtain super-resolution dynamic images of the 3D structures and sound fields both in and perpendicular to the imaging plane and reserve time domain information of the sound fields. The progress of the present researches will provide a theoretical model and trustful experimental supports for understanding the interactions between the optical wave, the nano-scale structures of materials and sound fields.

英文关键词： Optical indirect microscopy imaging;Photorefractive interferometry;Nano-scale structures;Ultrasonic sound fields;Dynamic multi-dimensional super-resolution imaging