Electron, optical and acoustic characterization of advanced materials and microstructures

研究的目标是构建新型显微镜和发展新的显微镜方法，以便对材料的性质进行新的测量。这种显微镜利用全息技术来干扰电子、光子和声束。材料的特性是由穿过材料的光束的强度和相位来确定的。一种显微镜方法，能量过滤衍射束全息（DBH）正被用于从相干度和空间相干宽度测量中测量等离子体和声子的相干特性，这将使研究人员能够理解纳米科学并开发纳米技术。能量滤波DBH还应该能够测量电子材料中带间电荷（电子、空穴、掺杂剂）的相干性，以及磁性材料中磁振子的磁势和相干性。共聚焦全息显微镜（CH）可以非侵入式地测量材料的绝对三维温度、成分、静电和磁势。各种类型的CH显微镜已经被设计、模拟，现在正在建造中。激光CH显微镜将测量流体和固体中的温度和成分，以帮助解释热量和质量传递机制。声学CH显微镜将用于医学诊断目的测量人体组织代表物体的温度和成分。电子CH显微镜将在纳米尺度上测量材料中的静电和磁势，最终目标是了解原子之间存在的电子密度。

The objectives of the research are to construct new types of microscopes and develop new methods of microscopy in order to make new measurements of the properties of materials. The microscopes use holography to interfere electrons, photons and acoustic beams. The material properties are being determined from the intensity and phase of beams having passed through the materials. One microscopy method, energy-filtered diffracted beam holography (DBH) is being used to measure the coherence properties of plasmons and phonons from degree of coherence and spatial coherence width measurements, which will enable researchers to understand nanoscience and to develop nanotechnology. Energy-filtered DBH should also be able to measure the coherence properties of interband charges (electrons, holes, dopants) in electronic materials and the magnetic potential and coherence of magnons in magnetic materials. A confocal holography (CH) microscope will non-intrusively measure the absolute three-dimensional temperatures, compositions, electrostatic and magnetic potentials existing in materials. Various types of CH microscopes have been designed, simulated and are now under construction. A laser CH microscope will measure temperatures and compositions in fluids and solids to help explain heat and mass transport mechanisms. An acoustic CH microscope will measure temperatures and compositions of objects representative of human tissue for medical diagnostic purposes. An electron CH microscope will measure electrostatic and magnetic potentials in materials at the nanoscale with the ultimate goal of knowing the electron density existing between the atoms.