Surface Plasmon Resonance Enhanced Scanning Near-Field Pockels Microscope Observation of Polar Structure

表面等离子体共振增强扫描近场普克尔显微镜观察极性结构

基本信息

批准号：
15560002
负责人：
KAJIKAWA Kotaro
金额：
$ 2.05万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

We have developed a scanning near-field optical microscope that can image Pockels effects in ultrathin films such as a monomolecular layers. Pockels effect, sometimes called "linear electrooptic effect" is one of the second-order nonlinear optical processes that occur in a system without any inversion center under electric dipole approximation. Hence a polar structure can be probed with this technique. In addition, this microscope allows us to observe polar structure even in untrathin films because the surface plasmon resonance effect offers high sensitivity for the chance in the refractive index in a media. This promises possible observation of a small change in the refractive index i(<10^<-6>) in ultrathin films.The features of this microscope are :(1)an optical microscope that can prove the polar structure in a untrathin films.(2)the observation can be preformed without any high power lasers(3)we can make spectroscopic measurement easily.(4)we can prove nanometer sized region using a sharp tip.We have observed pattered dye-monomolecular layers adsorbed on a 45nm-thick thin gild film. The pattered size was 40x40μm. The Pockels images taken in the surface plasmon resonance condition were compared with the images obtained by second-harmonic generation microscopy that can also probe a polar structure, and confirmed a high correspondence between them. Although the present resolution is limited within about 10μm, it is likely that use of a sharp tip and a piezo stage with high resolution will provide much higher resolution.

我们已经开发了一种扫描近场光学显微镜，该光学显微镜可以在超薄膜（例如单分子层）中成像Pockels效应。 Pockels效应有时称为“线性电效应”，是在系统中没有任何反转中心在电偶极子近似下发生的二阶非线性光学过程之一。因此，可以使用该技术探测极性结构。此外，该显微镜即使在Untrathin膜中也可以观察到极性结构，因为表面等离子体共振效应对介质中折射率的机会具有很高的灵敏度。这有望观察到超薄膜中的折射率I（<10^<-6>）的微小变化。该显微镜的特征是：（1）光学显微镜可以证明未经雷丁的膜中的极性结构。（2）在没有任何高功率激光器的情况下，我们可以轻松地进行观察（3），我们可以轻松地（3）我们可以使用一定的ne searder searder searder seprectial searder sige sige sige sige seprection super sige seprection。提示。我们观察到图案化的染料分子分子层吸附在45nm厚的薄镀金膜上。图案尺寸为40x40μm。将表面等离子体共振条件下拍摄的Pockels图像与通过第二谐波生成显微镜获得的图像进行了比较，这些图像也可以探测极性结构，并确认它们之间的较高对应关系。尽管目前的分辨率在约10μm内受到限制，但使用尖端和具有高分辨率的压电阶段可能会提供更高的分辨率。