Reflection-Mode All-Optical Parallel Switching in Guided Wave Geometry Including Photochromic Compounds
Reflection-Mode All-Optical Parallel Switching in Guided Wave Geometry Including Photochromic Compounds
复制标题
包括光致变色化合物的导波几何结构中的反射模式全光并行切换
DOI：
10.1080/10587250008023836
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Kyoichi Sasaki
中科院分区：
文献类型：
--
作者：
T. Nagamura;Kyoichi Sasaki
摘要利用光致复折射率的变化，在由银和含光致变色染料的聚合物组成的导模薄膜中实现了一种新型的全光并联开关器件。探测光束的入射角被设置为与由于导模引起的最小反射相对应的值。脉冲激光激发引起聚合物薄膜光致变色吸收的变化，导致导模条件改变，反射率增加。根据Kramers-Kronig关系，真实的部分也会改变，这导致最小值的移动。在这种结构中，可以选择合适的波长用于全光开关。我们使用分散在聚苯乙烯中的光致变色螺吡喃。在紫外或可见光激光激发下实现了自保持并联开关，响应时间小于20 ns。
Abstract A novel all-optical parallel switching device was demonstrated by using photoinduced changes of a complex refractive index in a guided mode thin film composed of silver and polymer containing photochromic dyes. An incident angle of a probe beam was set at a value corresponding to the minimum reflection due to the guided mode. Pulsed laser excitation caused changes of absorption of the polymer films due to photochromism, which resulted in the increase of reflection because the guided mode condition was changed. According to the Kramers-Kronig relationship the real part also changes, which results in the shift of the minimum. Appropriate wavelength can be selected for all-optical switching in this geometry. We used photochromic spiropyran dispersed in polystyrene. Self-held parallel switching was achieved upon UV or visible laser excitation with response times less than 20 ns.
影响因子：
4
作者：
Kyoichi Sasaki;T. Nagamura
通讯作者：
Kyoichi Sasaki;T. Nagamura