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

为了开发传感器等有机器件，研究了表面等离子体激元(SP)激发产生的发射光。SPS是自由电子和光的耦合模式，在Kretschmann和Otto结构中，由于p偏振激光束的全反射，它们可以被电磁波共振激发在金属表面上。制备了多种纳米结构的有机超薄膜，研究了衰减全反射(ATR)法中棱镜/金属薄膜/纳米结构的Kretschmann结构中的SP激发和发射光.采用摩擦法制备了分子取向的薄膜，发现ATR和SP的发光性质与分子取向有关.人们认为SP的激发可以由分子的排列来控制。用于SP激励…的棱镜/金属薄膜/介质薄膜/金属薄膜双金属薄膜结构还制备了更多Kretschmann和Otto构型的S，并测量了具有和不具有发光染料分子层的结构的ATR和SP发射光性质。具有发光染料分子层的结构的发射光强度比没有发光染料分子层的结构的发射光强度大得多。发射光与染料的光致发光有关，其强度和光谱强烈依赖于发射角度。用SP发射光测量了含有发光染料分子的聚合物微球的吸附，SP发射光有望成为一种新的传感技术。还制备了含有发光染料分子的有机微球的聚合物薄膜，并测量了其ATR和SP发射光性能。聚合物样品交替暴露在干气和湿气中，交替暴露在干气和湿气中后的ATR和SP发射光性能是可重现的。研究发现，SP发光灯对湿度传感器的发展是有益的，这些结果表明，SP激发和发光灯可以通过发光染料分子的纳米结构排列来控制，在各种传感器和新型光学器件中的应用是有用的。较少

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