光学器件正在向着小型化、集成化以及柔性可变形等方向发展,基于集成微纳光学器件的光学系统以其较低的功耗、快速的响应时间以及高信息容量等优势脱颖而出。然而目前的高精度微纳加工手段如聚焦离子束(focused ion beam,FIB)刻蚀、半...光学器件正在向着小型化、集成化以及柔性可变形等方向发展,基于集成微纳光学器件的光学系统以其较低的功耗、快速的响应时间以及高信息容量等优势脱颖而出。然而目前的高精度微纳加工手段如聚焦离子束(focused ion beam,FIB)刻蚀、半导体光刻等工艺复杂,且缺乏灵活性。飞秒激光作为一种非接触、高精度、高脉冲强度的“冷”加工工具在微纳加工方面受到格外青睐。本文首先阐述了飞秒激光加工微纳光学器件的背景及相关机理,然后讨论了提高飞秒激光加工分辨率的各种方法,接着综述了基于飞秒激光的多种先进加工手段,其后总结了近年来飞秒激光加工微透镜、光栅、光波导以及光子晶体方面的代表性研究进展。最后,本文概括了飞秒激光加工微纳光学器件研究领域所面临的挑战以及未来发展方向。展开更多
Safety accidents occure frequently during metro construction, which are mainly caused by human factors, and the incidence of accidents can be increased due to the overlap of human factors and physical factors. The hum...Safety accidents occure frequently during metro construction, which are mainly caused by human factors, and the incidence of accidents can be increased due to the overlap of human factors and physical factors. The human factors are taken as breakthrough to make early warning for the human insecurity factors in the metro construction, which can effectively reduce the occurrence of safety accidents. This paper proposes the principle of total monitoring and early-warning management. The unsafe behaviors in metro construction when approaching the hazardous area and non-standard safety prevention measures are analyzed to design and model the early warning process of unsafe behaviors in metro construction. Finally, the model is analyzed and verified using actual examples.展开更多
文摘光学器件正在向着小型化、集成化以及柔性可变形等方向发展,基于集成微纳光学器件的光学系统以其较低的功耗、快速的响应时间以及高信息容量等优势脱颖而出。然而目前的高精度微纳加工手段如聚焦离子束(focused ion beam,FIB)刻蚀、半导体光刻等工艺复杂,且缺乏灵活性。飞秒激光作为一种非接触、高精度、高脉冲强度的“冷”加工工具在微纳加工方面受到格外青睐。本文首先阐述了飞秒激光加工微纳光学器件的背景及相关机理,然后讨论了提高飞秒激光加工分辨率的各种方法,接着综述了基于飞秒激光的多种先进加工手段,其后总结了近年来飞秒激光加工微透镜、光栅、光波导以及光子晶体方面的代表性研究进展。最后,本文概括了飞秒激光加工微纳光学器件研究领域所面临的挑战以及未来发展方向。
基金Supported by the National Natural Science Foundation of China(71603284)the Humanity and Social Science Research Foundation of Ministry of Education PRC(16YJC630068)the China Postdoctoral Science Foundation(2019T120718,2018M630918).
文摘Safety accidents occure frequently during metro construction, which are mainly caused by human factors, and the incidence of accidents can be increased due to the overlap of human factors and physical factors. The human factors are taken as breakthrough to make early warning for the human insecurity factors in the metro construction, which can effectively reduce the occurrence of safety accidents. This paper proposes the principle of total monitoring and early-warning management. The unsafe behaviors in metro construction when approaching the hazardous area and non-standard safety prevention measures are analyzed to design and model the early warning process of unsafe behaviors in metro construction. Finally, the model is analyzed and verified using actual examples.