Development of Functional Scanning Near-field Optical Microscope and Their Nano-scale Spectroscopy of Fine-particle Crystals

对扫描近场光学显微镜(SNOM)的纳米级光谱及其高功能性进行了研究。聚苯乙烯细粒子阵列晶体的近场效应。(1)当光波波长越过晶体的光子带共振时，SNOM透射图发生反转。(2)由于探头主要拾取平行于层的偏振分量，所以近场光学显微镜的图样在照明和采集模式下都是相似的。(3)近场光学显微镜的图样随粒子半径、探头孔径大小和光波长的不同而有很大的不同。这一事实表明了使用阵列晶体作为探头质量的标准度量的有效性。(4)在保持相同的粒子间距的情况下，光子带的带宽随着粒子尺寸的减小而变窄。与形式…的情况一样，每个粒子的WG模式的粒子间重叠是基本的2.更多的电子频带。高功能性的研制：(1)用石英振荡器代替激光控制探头的高度。(2)将SNOM装置放入恒温器中，在100K下进行测量。(3)用直光纤探头实现了偏振测量，并成功地应用于沸石亚微米晶体的晶体取向测量。(4)利用石英光纤实现了紫外光测量，并利用小刚性常数的探头实现了柔性测量。光(1)直径小于100 nm、深度几十nm的孔洞通过近场光照射在沸石微晶表面进行纳米级加工。表面激子的光激发加速了组成分子在表面的解吸或解离，从而使这一过程成为可能。(2)用原子力显微镜研究了光处理后的时间形貌变化。表面分子的平均扩散速度约为2~3 nm/min。较少

Nano-scale spectroscopy of scanning near-field optical microscope (SNOM) and its high-functionality have been investigated as follows.1. Near-field effects on polystyrene fine-particle array crystals.(1) SNOM transmission images were reversed as the wavelength of light crossed the photonic-band resonance of the crystal. The patterns were reproduced by calculation.(2) The SNOM patterns resembled both for illumination and collection modes since the probe mainly picked up the polarization component parallel to the layer.(3) The SNOM patterns varied drastically depending on the particle radius, aperture size of SNOM probe and wavelength of light. This fact indicates the effectiveness of using the array crystal as a standard measure of the quality of the probe.(4) The bandwidth of the photonic bands becomes narrow as the particle size reduces with keeping the same inter-particle distance. The inter-particle overlapping of the WG modes of each particle is essential as in the case of the form … More ation of electronic bands.2. Development of high functionality(1) Quartz oscillator was used to control the probe height instead of laser control.(2) SNOM apparatus was put in a cryostat and the measurement was done at 100K.(3) A straight fiber probe made possible the polarization measurement and successively applied for the measurement of crystal orientation of sub-micron crystals of perylene.(4) UV measurements with use of silica fiber and flexible measurements with using the probes of small stiffness constant were both realized.3. Nano-scale processing by light(1) Holes of less than 100nm in diameter and a few tens of nm in depth were made by irradiation of near-field light on the surface of perylene microcrystals. The processing became possible due to the photo-excitation of surface excitons, that accelerate the desorption or dissociation of constituent molecules on the surface.(2) Temporal topographic change after the photo-processing was investigated by AFM. Average diffusion speed of the surface molecules were about 2〜3nm/min. Less