Quantum Gas Jet-based Helium Atom Microscope (qHAM)

基于量子气体喷射的氦原子显微镜 (qHAM)

基本信息

批准号：
10004615
负责人：
金额：
$ 5.47万
依托单位：
UNIVERSITY OF LIVERPOOL
依托单位国家：
英国
项目类别：
Feasibility Studies
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=10004615
关键词：
Quantum Gas Jet based Helium

项目摘要

Conventional microscopy tools have a number of limitations: Light microscopy is intrinsically limited to around micron length-scales; electron microscopy often leads to sample damage or charging; and scanning probe methods (such as atomic force microscopy) are limited to small areas on predominantly flat surfaces.These limitations cause significant problems for surface morphological studies: delicate samples such as 2-dimensional organic thin films risk being damaged by energetic electron beams; more complex insulating structures cannot be imaged with high resolution by electron beams as they are accumulating charges; and bio-materials with complex topographies cannot be imaged by conventional scanning probe techniques such as Atomic Force Microscopy (AFM).This project will overcome these limitations by exploiting two quantum phenomena: Wave-Matter duality and matter wave Interference. The de Broglie wavelength ? of a particle is related to its momentum p by ?=h/p, where h is Planck's constant. For a helium atom moving with thermal velocity at room temperature, the average de Broglie wavelength is 0.9 Angstroem. An atom sieve designed on the principle of Fresnel Zone Plates (FZP) achieves a focus at the point where the path difference between molecules travelling via adjacent zones is equal to one wavelength. From this condition, the radius at the focal point can be derived - this extremely small and in the micrometer range, giving access to high resolution imaging.A quantum gas jet-based Helium Atom Microscope (qHAM) will be developed as a compact, low cost and table-top microscope with superior imaging capabilities.

常规显微镜工具具有许多局限性：光学显微镜本质上限制在微米长度周围；电子显微镜通常会导致样本损伤或充电；和扫描探针方法（例如原子力显微镜）仅限于主要平坦表面上的小区域。这些限制对表面形态学研究造成了重大问题：诸如二维有机薄膜等细腻的样品可能会受到能量电子束会损害的二维有机薄膜。当电子束积累电荷时，无法用高分辨率成像更复杂的绝缘结构；传统的扫描探针技术（例如原子力显微镜（AFM））不能对具有复杂地形的生物材料进行成像。该项目将通过利用两种量子现象来克服这些局限性：波浪 - 一种二元性二元性和物质波浪干扰。 de broglie波长？粒子与其动量p相关，= h/p，h planck的常数在哪里。对于在室温下以热速度移动的氦原子，平均DE Broglie波长为0.9盎格鲁。根据菲涅尔区板（FZP）原理设计的原子筛，在通过相邻区域传播的分子之间的路径差等于一个波长的位置。从这种情况下，可以得出焦点处的半径 - 这个极小且在千分尺范围内，可以访问高分辨率成像。基于量子气射流的氦气原子显微镜（QHAM）将作为紧凑，低的低点开发具有出色成像功能的成本和台式显微镜。