利用蚕丝制作的微米光器件的研究

利用Na2CO3水溶液将蚕茧去除丝胶得到直径为5～15μm的生物纤维,采用扫描电镜(SEM)和透射电镜(TEM)观察了其形貌特征。通过倏逝波耦合的方法,利用SiO2微纳光锥将波长为671 nm的红光、532 nm的绿光、473 nm的蓝光分别耦合进入微米蚕丝生物光纤,分析了其导光特性,测量了光在蚕丝纤维中的传输损耗。制作了2×2、3×1、1×4、环形等光子结构。实验证明蚕丝微米生物光纤具有良好的柔韧性和表面光滑度,其中波长为532 nm的绿光在直径为9.0μm的蚕丝纤维中传输时的损耗为0.78 dB.mm-1。

Silk FiberBased Microphotonic Devices

By removing the sericin from the silk fibers using Na₂CO₃ solution, bio-fibers in diameters of 5~15 μm were fabricated and their morphology was observed using SEM and TEM. With the method of evanescent wave coupling, red/green/blue light at the wavelength of 671/532/473 nm was coupled into the micrometer-sized silk fiber-based optical fibers, followed by the investigation of the waveguiding properties and measurement of the optical propagating loss. Various photonic devices, including 2×2, 3×1, 1×4 and ring structures, were fabricated using the silk fibers. Experimental results confirm that the silk fiber-based bio-optical fibers exhibit good flexibility and surface smoothness. A propagating loss of 0.78 dB·mm^-1 was obtained for the green light at 532 nm guided in the silk fiber with diameter of 9.0 μm.