Optical near-field excitation using liquidcrystals on nanostructured photoreactive molecular thin films, Science China Physics
Optical near-field excitation using liquidcrystals on nanostructured photoreactive molecular thin films, Science China Physics
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在纳米结构光反应分子薄膜上使用液晶进行光学近场激发，《中国科学》物理
DOI：
10.1007/s11433-012-4754-1
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Futao Kaneko
中科院分区：
文献类型：
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作者：
Yasuo Ohdaira;Kazunari Shinbo,Akira Baba,Keizo Kato;Futao Kaneko
基于光反应性分子薄膜的光学可重写纳米结构上液晶（LC）的分子排列控制，研究了光学近场激发。液晶分子的扭曲向列 (TN) 单元是利用 ITO 基板和偶氮苯分子薄膜的 260 nm 光栅构建的，该光栅是使用驻倏逝波制造的。观察到透过 TN 单元的光的偏振变化，这是由于偶氮苯纳米光栅局部摩擦液晶分子的排列变化所致。此外，我们证明了使用倾斜真空蒸发沉积在偶氮苯纳米光栅上的金纳米线的局部等离激元激发，这种现象产生了强反光吸收光谱。证实了用液晶分子装饰的金属纳米线的局部等离子共振的调制。
Optical near-field excitations were investigated on the basis of molecular alignment control of liquid crystals (LCs) on an optically rewritable nanostructure of photoreactive molecular thin films. Twisted nematic (TN) cells of LC molecules were constructed utilizing ITO substrates with 260 nm gratings of an azobenzene molecular thin film, fabricated using standing evanescent waves. The polarization changes of light transmitted through the TN cells, which were due to the alignment changes of LC molecules locally rubbed by the azobenzene nanogratings, were observed. Furthermore, we demonstrated local plasmon excitation of Au nanowires deposited on the azobenzene nanogratings using oblique vacuum evaporation, a phenomenon that produced strong anti-optical absorption spectra. The modulation of the local plasmon resonance in metallic nanowires decorated with LC molecules was confirmed.