Optival Near-Field Interaction of Atoms with Dielectric Sarface

原子与介电表面的最佳近场相互作用

• 批准号: 08640502
• 负责人: HORI Hirokazu
• 金额: $ 1.47万
• 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: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640502/
• 关键词: near-field cptics; surface atomic spectroscopy; optical pumping; laser spectroscopy; resenant ionization spectroscopy; evanescent wave; cavity quantum electrody nemics; atomic beam scattering; 共鳴イオン化分光; 光ボンピング

In this work, dynamics of photon-atom interactions in optical near-field near dielectric surface are studied both theoretically and experimentally .Shape-dependent character of optical near-field of subwavelength-seze dielectric matters is the origin of ultra-high resolution of optical near-field microscopes, which reflects on the dynamical variables in photon-atom interactions in optical near-field. Local symmetries under spatial displacement and rotation determine the conserved quantities, pseudo-momentum and pseudo-angular momentum, during near-field optical interacion.Thse characteristics are analyzed theoretically by developing a novel theoretical treatment of optical near-field and optical near-field interaction based on angular spectrum representation of vector field. This provides a very useful basis in development of general optical near-field theory including resolution problems in optical near-field microscopy.In the experimental work of this project, the pseudo-momentum tra … More nsfer has been demonstrated experimentally using a newly deve1oped laser spectroscopy technique with optical pumping of atomic hyperfine state. The results of resonant interaction of Cs atoms with evanescent waves show good agreement with theoretical prediction about short penetration depth and transfer of pseudomomentum which is larger than that in the case of resonant photon absorption in free space.For further development of experimental study in this direction, we should overcome the problem of small atomic number and spin sensitivity in near-field laser spectroscopy of atoms. We have developed a two-photon ionization spectroscopy using evanescent wave and succeeded to observe the hyperfine spectra of Cs atomic beam near a dielectric surface. A combination of highly frequency-controlled AlGaAs laser and ionizing blue-laser produces Cs ions which are detected by using secondary-electron multiplier and photon-counting system with an ultra-high sensitivity. This provides a very usuful tool especially for experimental studies taking account of the polarization behavior or spin state of optical near-field as well as aplications of manipulating spin states of atoms and electronic state of nanometer size matter. Less

本文从理论和实验两个方面研究了介质表面附近光学近场中光子-原子相互作用的动力学过程。亚波长介质材料光学近场的形状相关特性是光学近场显微镜具有超高分辨率的根源，它反映了光学近场中光子-原子相互作用的动力学变量。近场光学相互作用中的局域对称性决定了近场光学相互作用中的伪动量和伪角动量守恒量，通过发展一种新的基于矢量场角谱表示的光学近场和光学近场相互作用的理论处理方法，从理论上分析了近场光学相互作用的特性。这为包括光学近场显微镜分辨率问题在内的一般光学近场理论的发展提供了非常有用的基础。在本项目的实验工作中，赝动量变换…用一种新发展的激光光谱学技术，利用原子超精细态的光泵浦技术，实验证明了更多的NSFER。Cs原子与逝去波的共振相互作用结果与理论预测的穿透深度较短，在自由空间的共振光子吸收情况下的赝量转移较大，为进一步开展这方面的实验研究，应克服原子近场激光光谱中原子数目较小和自旋敏感性的问题。我们发展了一种利用逝去波的双光子电离光谱，并成功地观测到Cs原子束在介质表面附近的超精细光谱。高频率控制的AlGaAs激光器和电离蓝光相结合产生Cs离子，利用二次电子倍增器和光子计数系统以超高的灵敏度进行探测。这为实验研究光学近场的极化行为或自旋态，以及操纵原子的自旋态和纳米级物质的电子态提供了一个非常有用的工具。较少

项目成果

T.Inoue: "Representation and Transform of Vector Field as the Basis of Near-Field Optics" Optical Review. vol.13:No.6B. 458-462 (1996)

T.Inoue：“作为近场光学基础的矢量场的表示和变换”光学评论。

T.Matsudo: "Direct detection of evanescent electromagnetic waves at a planar dielectric surface by laser atomic spectroscopy" Physical Review A. Vol.55.No.3. (1997)

T.Matsudo：“通过激光原子光谱直接检测平面介电表面的瞬逝电磁波”《物理评论》A. Vol.55.No.3。

T.Matsudo: "Pseudomomentum transfor from evanescent waves to atoms measured by saturated absorption spectroscopy" Optics Communications. Vol.145. 64-68 (1998)

T.Matsudo：“通过饱和吸收光谱测量从倏逝波到原子的赝动量转换”光学通讯。

T.Matsudo: "Pseudomomentum transfer from evanescent waves to atoms measured by saturated absorption spectroscopy" Optics Communications. Vol.145. 64-68 (1998)

T.Matsudo：“通过饱和吸收光谱测量从倏逝波到原子的赝动量转移”光学通讯。

T.Matsudo: "Direct detection of evanescent electrcmagnetic waves at a planar olieloctric spurface by laser atomic spectroscopy" Physical Review A. vol.55・No.3. 2406-2412 (1997)

T.Matsudo：“通过激光原子光谱直接检测平面油电表面的瞬逝电磁波”物理评论 A. vol.55·No.3（1997）。