Study on two-dimensional atomic-lattice in an optical potentail procduced by evanescent waves

倏逝波光势中二维原子晶格的研究

基本信息

批准号：
11640393
负责人：
HORI Hirokazu
金额：
$ 2.24万
依托单位：
Yamanashi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

Optical near-field laser spectroscopy has a potential to bring novel techniques of controlling and manipulating atomic motion and states especially in two-dimension, which can not be achieved by propagating laser lignt in free space. This is due to the nature of optical near-fields representing coupled modes of optical fields with matter. In this research we propose a possibility to produce a two-dimensional lattice of laser-cooled atoms in an optical potential produced by evanescent waves near a dielectlic surface, which provides a useful technique to investigate novel quantum mechanical feature of atom-field interaction related to a generalized cavity quantum electrodynamics study. To this aim we have developed several basic techniques of near-field laser spectroscopy and quantum optical theory of photon-atom interaction in optical near-field. In this research, we have proposed a possibility of utilizing a locally rotating electric field produced by a cross-propagating pair of evanes … More -cent waves to a control of atomic spin states via optical pumping. The existence of the locally rotating optical near-field has been experimentally demonstrated for the.first time by using a set of near-field light scatttering experimets using small dielectric probes and an ultra-high sensitivity polarization analysing systme developed hi this research. As the basic tool of observing the spin-state of cold atoms in a subwavelength vicinity of dielectric surface we have developed a spin-selective resonant two-photon ionization spectroscopy using evanescent waves with sensitivity oflO ion-counts level. We have extended this scheme into an ionization-microscope and demonstrated its potential to a simul-taneous operation for microscopy and spectroscopy. As a theoretical background we have developed a novel framework of second-quantization of evanescent electromagnetic fieldS based on the detector modes introduced in this research. As an application we have evaluated the radiation properties of excited atomic multipoles of arbitrary order near a dielectric surface as a generalized cavity quantum electrodynamics study. Less

光学近场激光光谱有可能带来控制和操纵原子运动和状态的新技术，尤其是在二维空间中，这是通过在自由空间中传播激光无法实现的，这是由于光学近场的本质。在这项研究中，我们提出了一种在介电表面附近的倏逝波产生的光势中产生激光冷却原子的二维晶格的可能性，这提供了一种有用的方法。技术来研究与广义腔量子电动力学研究相关的原子场相互作用的新量子力学特征为此，我们开发了近场激光光谱和光学近场中光子原子相互作用的量子光学理论的几种基本技术。在这项研究中，我们提出了利用一对交叉传播的伊文斯波产生的局部旋转电场通过光泵浦控制原子自旋状态的可能性。场有首次通过一套使用小型介电探针的近场光散射实验和本研究开发的超高灵敏度偏振分析系统作为观察冷自旋态的基本工具进行了实验证明。我们开发了一种使用倏逝波的自旋选择共振双光子电离光谱，其灵敏度为lO离子计数水平。已将该方案扩展到电离显微镜中，并展示了其同时操作显微镜和光谱学的潜力作为理论背景，我们基于本文中介绍的探测器模式开发了一种新的瞬逝电磁场第二量子化框架。作为一项应用，我们评估了介电表面附近任意阶激发原子多极子的辐射特性，作为广义腔量子电动力学研究。