飞秒激光诱导硫系玻璃亚波长纳米光栅结构演化过程的瞬态研究

Femtosecond laser induced-subwavelength grating structure is not only combined with birefringent and rewritable characteristics of nano-gratings, but takes advantages of femtosecond laser in nano-processing field, This structure has a wide application prospect in the future of optical communication, optical sensing and optical information storage etc.. It’s hard to obtain the transient optical field and the morphology in the laser-induced sub-wavelength grating processing. In this project, we use chalcogenide glasses as substrate, and clarify the transient process of surface morphology and structure’s optical properties after laser irradiation. We want to solve the mechanism of energy absorption and elucidate the transient of the surface morphology, the surface tension induced mass transport, and the effect of the ablative material removal and their dependence on the imparted laser fluence. Finally, Combining the advantage of the chalcogenide glass materials in the mid infrared, we can get one or two-dimensional photonic crystal on the surface, which can have the band gap characteristics in the certain wavelength. In this condition, this technology can extended applications of subwavelength-gratings in the field of mid-infrared filtering.

飞秒激光诱导亚波长光栅结构不仅兼具纳米光栅结构的双折射和可重复擦写等特性，而且借助于飞秒激光在微纳加工领域的优势，亚波长光栅结构在未来光通信、光学检测和光信息存储等领域有着广泛地应用前景。在激光诱导亚波长光栅结构过程中，实验上直接获得激光光场瞬态分布和光栅结构的瞬态演化过程方面存在局限性，本项目以红外硫系玻璃材料为介质，围绕实现对飞秒激光诱导亚波长光栅结构过程中的形貌特征和光学性质的瞬态监测两个科学问题，解决飞秒激光诱导硫系材料亚波长光栅结构过程中的能量吸收和亚波长光栅结构的瞬态演化机制，最终结合硫系玻璃材料在中远红外波段优良光学特性，在其表面实现一维和二维光子晶体的波长选择特性，为拓展硫系光栅在中远红外滤波领域中的应用奠定坚实的基础。

秒激光诱导亚波长光栅结构不仅兼具纳米光栅结构的双折射和可重复擦写等特性,而且借助于飞秒激光在微纳加工领域的优势,亚波长光栅结构在未来光通信、光学检测和光信息存储等领域有着广泛地应用前景。在激光诱导亚波长光栅结构过程中,实验上直接获得激光光场瞬态分布和光栅结构的瞬态演化过程方面存在局限性,本项目以红外硫系玻璃材料为介质,围绕实现对飞秒激光诱导亚波长光栅结构过程中的形貌特征和光学性质的瞬态监测两个科学问题,解决飞秒激光诱导硫系材料亚波长光栅结构过程中的能量吸收和亚波长光栅结构的瞬态演化机制,最终结合硫系玻璃材料在中远红外波段优良光学特性,在其表面实现一维和二维光子晶体的波长选择特性,为拓展硫系光栅在中远红外滤波领域中的应用奠定坚实的基础。