Ultrafast photoresponsive materials and molecular photonics applications by guided wave mode geometry
Ultrafast photoresponsive materials and molecular photonics applications by guided wave mode geometry
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DOI：
10.1016/j.stam.2006.09.012
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发表时间：
2006-10-01
影响因子：
5.5
通讯作者：
Naito, Atsushi
中科院分区：
文献类型：
--
作者：
Nagamura, Toshihiko;Nagai, Yasuyuki;Naito, Atsushi
分子光子学是一种基于光子与分子强相互作用的信息处理技术，它能充分利用光子和分子的许多上级性质，引起了人们的广泛关注。我们已经开发出的聚合物材料显示超快的吸收变化，在可见光到近红外区域，包括电信波长的光诱导电子转移和取代的吡啶和它的抗衡阴离子之间的逆反应。通过选择抗衡阴离子，我们成功地使稳定和超快的吸收变化。飞秒激光激发下的时间分辨吸收光谱和荧光光谱揭示了反应机理和超快动力学。为了在分子光子学中充分利用这种光响应，我们提出了由棱镜、低折射率聚合物薄膜和光响应聚合物薄膜组成的导波模式（GWM）器件。该GWM中的反射率由许多因素控制，诸如两个聚合物层的厚度值和复折射率以及入射角和波长。我们成功地实现了敏感的，全光学的，非常快速的控制反射率的光致复折射率的变化后，飞秒激光激发的装置。(c)2006 NIMS和Elsevier Ltd.保留所有权利。
Molecular photonics, information processing based on strong interactions of photons and molecules, has attracted much attention, since it can fully utilize many superior properties of both photons and molecules. We have developed polymeric materials showing ultrafast absorption changes in the visible to near-infrared regions including the telecommunication wavelength by photoinduced electron transfer and reverse reactions between substituted pyridinium and its counter anion. By selecting the counter anion we succeeded in making steady and ultrafast absorption changes. Time-resolved absorption and fluorescence spectroscopy upon femtosecond laser excitation revealed reaction mechanism and ultrafast dynamics. In order to fully utilize such photoresponses in molecular photonics, we proposed guided wave mode (GWM) device composed of a prism, a low refractive index polymer film, and a photoresponsive polymer film. The reflectance in this GWM is controlled by many factors such as thickness values and complex refractive indices of two polymer layers as well as an incident angle and wavelength. We successfully achieved sensitive, all optical, and very fast control of reflectance by means of photoinduced complex refractive index changes upon femtosecond laser excitation. (c) 2006 NIMS and Elsevier Ltd. All rights reserved.