Development of Nanoscale Laser Spectroscopy Based on Photon STM for the Study of Semiconductor Mesoscopic Systems

开发基于光子 STM 的纳米级激光光谱用于半导体介观系统的研究

基本信息

批准号：
07554007
负责人：
ITOH Tadashi
金额：
$ 13.7万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

The aim of this project is to ascertain the validity of photon STM (Scanning Near-field Optical Microscope, SNOM) by making AFM/SNOM instruments with cantilever-type optical fiber probe, which can be used in vacuum and also at low temperature. As a typical sample for SNOM measurement, we have adopted the layr of polystirene particles (LATEX) which are self-organized two-dimensionally on a glass plate.1) Transmission and luminescence excitation images of LATEX layrs by the use of the illumination mode have been measured. Electromagnetic waves propagating both along and perpendicular to the layr plane with some preferable propagation directions are observed. The SNOM images are found to be dependent on the wavelength of the laser light and expected to reveal some properties about photonic band effect in this 2D periodic material. The same images are found both in the illumination and the collection modes for the optical probe operation and the time-reversal theorem in this system has been discussed together with theoretical expectation.2) For atomic force detection, we have applied tuning fork technique without suffering from a stray light coming from the laser used for sensing the fiber vibration. Clear images similar to the conventional one are obtained and the quartz detection is found to work at very low temperatures in vacuum.3) SNOM images of assembled semiconductor nanoparticles with photon energy at some electronic resonance condition have been theoretically investigated under the scheme of nonlocal optical response theory by taking into account both the resonant and nonresonant contributions of the induced polarization. The SNOM images are found to be dependent on the operation modes of the fiber probe due to the configuration resonance effect.These results demonstrate the validity of the photon STM (SNOM) for the optical measurement of single or assembled nanoparticles of semiconductors in submicrometer scale.

该项目的目的是通过制造带有悬臂式光纤探针的AFM/SNOM仪器来确定光子STM（扫描近场光学显微镜，SNOM）的有效性，该仪器可以在真空和低温下使用。作为 SNOM 测量的典型样品，我们采用了在玻璃板上二维自组织的聚苯乙烯颗粒层 (LATEX)。 1) 使用照明模式得到的 LATEX 层的透射和发光激发图像有：被测量。观察到沿层平面和垂直于层平面传播的电磁波，具有一些优选的传播方向。人们发现 SNOM 图像取决于激光的波长，并有望揭示这种二维周期性材料中光子带效应的一些特性。在光学探针操作的照明和收集模式下都发现相同的图像，并且该系统中的时间反转定理已与理论期望一起讨论。2）对于原子力检测，我们应用了音叉技术，没有受到影响来自用于感测光纤振动的激光器的杂散光。获得了与传统图像相似的清晰图像，并且发现石英检测可以在真空中非常低的温度下工作。3）在非局域光学方案下，从理论上研究了在某些电子共振条件下具有光子能量的组装半导体纳米颗粒的SNOM图像。通过考虑激发极化的谐振和非谐振贡献来建立响应理论。由于配置共振效应，SNOM 图像被发现依赖于光纤探针的操作模式。这些结果证明了光子 STM (SNOM) 对于亚微米尺度的单个或组装半导体纳米颗粒的光学测量的有效性。