Surface Plasmon Emission Lights from Nanostructured Organic Ultrathin Films and Application to Sensors

为了研制传感器等有机器件，研究了表面等离子激元（SP）激发的发射光。SPs是一种自由电子与光的耦合模式，由于p偏振激光束的全反射，SPs可以在金属表面以Kretschmann和Otto组态被电磁波共振激发。制备了多种纳米结构有机超薄膜，采用衰减全反射（ATR）方法，在棱镜/金属薄膜/纳米结构超薄膜结构的Kretschmann结构下，研究了SP激发和发射光。采用摩擦法制备了分子取向薄膜，发现其ATR和SP发射光性能与分子取向有关。认为SP激发可以通过分子排列来控制。制备了具有两层金属薄层的棱镜/金属薄膜/介电薄膜/金属薄膜结构，分别具有Kretschmann和Otto两种构型，并测量了具有和不具有发光染料分子层结构的ATR和SP发射光性能。有发光染料分子层结构的发射光强度远大于无发光染料分子层结构的发射光强度。发射光与染料的光致发光有关，发光强度和光谱与发射角度密切相关。利用SP发射光测量技术对含发光染料分子的聚合物球的吸附性能进行了评价，并展望了SP发射光作为一种新的传感技术。制备了含有发光染料分子的有机微球聚合物薄膜，并测量了其ATR和SP发射光性能。将聚合物样品交替暴露于干湿气体中，可重现干湿气体交替暴露后的ATR和SP发射光性能。结果表明，SP发光灯可用于湿度传感器的研制。从这些结果来看，SP激发和发射光可以通过发光染料分子的纳米结构排列来控制，并且在各种传感器和新型光学器件中应用是有用的。少

Emission lights due to surface plasmon (SP) excitations have been investigated in order to develop organic devices such as sensors. SPs are a coupling mode of free electrons and light, and they can be resonantly excited on metal surfaces in the Kretschmann and the Otto configurations by electromagnetic waves due to the total reflection of a p-polarized laser beam. Various nanostructured organic ultrathin films were fabricated, and the SP excitations and emission lights were examined in the Kretschmann configuration of prism/metal thin film/nanostructured ultrathin film structure for the attenuated total reflection (ATR) method.Molecular aligned thin films were prepared using a rubbing method, and it was found that the ATR and SP emission light properties depend on the molecular orientation. It was considered that the SP excitations can be controlled by molecular alignments. Prism/metal thin film/dielectric thin film/metal thin film structure with two metal thin layers for SP excitation … More s in both Kretschmann and Otto configurations was also prepared, and the ATR and SP emission light properties were measured for the structures with and without a luminescent dye molecular layer. The intensity of the emission light from the structure with the luminescent dye molecular layer was much larger than that from the structure without the luminescent dye molecular layer. The emission lights were related to the photoluminescence of the dyes, and the intensity and the spectra strongly depended on the emission angles. Adsorptions of polymer spheres containing luminescent dye molecules were also evaluated using SP emission light measurements and the SP emission lights were expected as new sensing technique. Polymer films with organic microspheres containing luminescent dye molecules were also prepared and the ATR and SP emission light properties were measured. The polymer sample was exposed to dry and wet gas alternately, and the ATR and SP emission light properties after exposure to dry and wet gas alternately were reproducible. It was found that the SP emission lights were useful for the development of humidity sensors.From these results, it is considered that SP excitations and emission lights can be controlled by nanostructured alignments of luminescent dye molecules and are useful for the application to various sensors and new optical devices. Less