光纤

Abstract(#br)A novel optofluidic surface-enhanced Raman scattering (SERS) chip was specially designed and fabricated using polydimethylsiloxane (PDMS) and embedded with normal silica multi-mode optical fibers. Unlike in a conventional Raman detection configuration where an angle of 90° is commonly adopted, here the orientations of the excitation fiber and the collection fiber was set at such an obtuse angle so that the light beam from the excitation fiber can illuminate the endface, but is not within the acceptance angle of the collection fiber.

Abstract(#br)In this paper, we present a technique for producing fibers optics micro-collimators composed of polydimethylsiloxane PDMS microlenses of different radii of curvature. The waist and working distance values obtained enable the optimization of optical coupling between optical fibers, fibers and optical sources, and fibers and detectors. The principal is based on the injection of polydimethylsiloxane (PDMS) into a conical micro-cavity chemically etched at the end of optical fibers. A spherical microlens is then formed that is self-centered with respect to the axis of the fiber.

In this paper, we present IP-Dip polymer-based Photonic Crystals (PhCs), which are more and more attractive for photonic devices. These structures offer simple and cheap solutions, how to improve optical properties of these devices. In our experiment, we used Direct Laser Writing (DLW) lithography to create a three dimensional (3D) PhCs. We fabricated two types of PhC structure. The first structure was prepared from IP-Dip polymer and used for modification of the radiation pattern of the optical fiber.

我们实验演示了用简单的打结方法制备的弓形纤维结构( BFS )。由于芯模和包层模之间存在干涉，观察到输出光的干涉透射谱。输出透射光谱的消光比( ER )可以通过拔出BFS的光纤辫来调节，这表明该器件可以应用于应变或位移传感器。分别采用裸露和聚二甲基硅氧烷( PDMS )辅助的BFS对其温度传感性能进行了研究，与裸露结构相比，当PDMS层中嵌入微纤区域时，灵敏度大大提高，当温度从21.0℃变化到25.0℃时，灵敏度高达-1.63 nm /℃。

我们实验演示了用简单的打结方法制备的弓形纤维结构( BFS )。由于芯模和包层模之间存在干涉，观察到输出光的干涉透射谱。通过拉拔BFS的光纤头尾可以调节输出透射光谱的消光比( ER )，表明该器件可以应用于应变或位移传感器。分别用裸露和聚二甲基硅氧烷( PDMS )辅助的BFS来考察其温度传感性能。与裸结构相比，当PDMS层中嵌入微纤区域时，其灵敏度大大提高，当温度从21.0℃变化到25.0℃时，其灵敏度可达-1.63nm /℃。PDMS辅助的BFS具有良好的机械稳定性、高灵敏度、低成本、易加工和高柔韧性等优良特性，被认为具有广阔的应用前景。

本文提出了几种基于vernier效应的模式光纤温度传感器。传感器由两个级联的微腔组成，实现基于vernier效应的温度传感。单模光纤( SMF )和少模光纤( FMF )通过毛细管玻璃管固定形成空气参考微腔。将FMF末端浸入适量的聚二甲基硅氧烷( PDMS )，形成具有一定厚度的传感微腔，为空气微腔-FMF- PDMS结构。由于各介质的折射率不同，光被反射在4个临界面上，4个反射光束相互干涉，通过调节微腔长度到合适的长度形成vernier效应。当外界温度变化时，PDMS的微腔长度和折射率发生变化，导致干涉光谱发生变化。因此，通过反射光谱的变化可以实现温度的高灵敏度测量。对传感器的温度特性进行了实验研究。结果表明，与传统的单微腔传感器相比，温度灵敏度明显提高。在35 ° C ~ 45 ° C的温度范围内，温度灵敏度可达4.7 nm / ° C，线性度很好。该传感器具有结构紧凑、制作简单、灵敏度高等优点，在温度传感领域具有广阔的应用前景。