Violakis Georgios, Pissadakis Stavros
Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), N. Plastira 100, 70013, Heraklion, Greece.
Sci Rep. 2018 Oct 22;8(1):15586. doi: 10.1038/s41598-018-33855-4.
A new type of all-solid, photonic bandgap fiber exhibiting a wavelength dependent guidance mechanism and second harmonic generation capabilities is presented. A silica glass microstructured optical fiber was infiltrated with 2-methyl 4-nitroaniline for creating the composite material optical fiber. This optical fiber was characterized over a broad wavelength range, revealing that a transition from photonic bandgap guidance to modified total internal reflection propagation occurs from short to longer wavelengths, attributed to the dispersion characteristics of the low Abbe number nitroaniline. Annealing post-processing was used for tuning the morphology of the solidified nitroaniline inside the capillaries of the silica glass microstructured optical fiber which increased the extinction ratio of the transmission bandgaps. This composite material optical fiber also exhibits second harmonic generation capabilities under 1064 nm laser excitation, with conversion characteristics dependent upon the packing of the nitroaniline inside the optical fiber capillaries. As the pump and generated light fall into different guidance regimes of the optical fiber, such a device could be potentially used as an all optical gate or light conversion device.
介绍了一种新型全固态光子带隙光纤，它具有波长依赖的导光机制和二次谐波产生能力。用2-甲基-4-硝基苯胺浸润石英玻璃微结构光纤，以制备复合材料光纤。对该光纤在宽波长范围内进行了表征，结果表明，由于低阿贝数硝基苯胺的色散特性，从短波长到长波长会发生从光子带隙导光到修正全内反射传播的转变。采用退火后处理来调整石英玻璃微结构光纤毛细管内固化硝基苯胺的形态，这提高了传输带隙的消光比。这种复合材料光纤在1064 nm激光激发下也具有二次谐波产生能力，其转换特性取决于硝基苯胺在光纤毛细管内的填充情况。由于泵浦光和产生的光落入光纤的不同导光模式，这样的器件有可能用作全光门或光转换器件。
