Near-field optics imaging in silica waveguide using near-field scanning optical microscope
Near-field optics imaging in silica waveguide using near-field scanning optical microscope
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DOI：
10.1143/jjap.46.238
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发表时间：
2007-01-01
期刊：
影响因子：
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通讯作者：
Tsai, Din Ping
中科院分区：
文献类型：
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作者：
Chau, Yuan-Fong;Tsai, Din Ping
我们研究了近场光学成像的数值方法，使用特殊的球形链创建在二氧化硅波导（SWG），并探讨了如何将其用于近场扫描光学显微镜（NSOM）的应用的可能性。存在两种类型的球形纳米链;类型A包括紧密连接的纳米电介质球，并且类型B包括直径为4 nm的银纳米颗粒随机分布在类型A的纳米球内。将具有80 nm直径球体的球形纳米链嵌入SWG中。使用三维时域有限差分法分析了从SWG出现的光和样品表面附近的电场之间的相互作用，影响NSOM产生的图像的属性。讨论了各种因素对光场分布的影响。提出了一种利用外部突起（介质球）控制SWG中光场的方法。该结构将产生一些有用的信息，并给出了一个想法，在NSOM的应用。
We investigated the near-field optics imaging by a numerical method using special spherical chains created in a silica waveguide (SWG) and explored the possibility of how this can be used for near-field scanning optical microscopy (NSOM) applications. There are two types of spherical nanochain; type A includes nano-dielectric spheres connected closely, and type B includes silver nanoparticles 4 nm in diameter randomly distributed inside the nanospheres of type A. A spherical nanochain with the 80-nm-diameter spheres was embedded in the SWG. The interactions between light emerging from SWG and the electric field near the sample surface that affects the properties of the images produced by NSOM are analyzed using a three dimensional finite-difference time-domain method. The effects of the optical field distribution generated by some factors are also discussed. A method of controlling the light field localized in the SWG is proposed that uses the external protrusion (dielectric sphere). The proposed structure will yield some useful information and give an idea of applications in NSOM.