光子晶体是一种具有光子能带和带隙特性的空间周期性结构的人工电磁材料,因其具有的强大控光能力而在多种微纳光学功能器件中广泛应用,而光学生物传感器就是其中之一。光学生物传感器由于具有节能环保、抗干扰能力强、响应迅速等优势成...光子晶体是一种具有光子能带和带隙特性的空间周期性结构的人工电磁材料,因其具有的强大控光能力而在多种微纳光学功能器件中广泛应用,而光学生物传感器就是其中之一。光学生物传感器由于具有节能环保、抗干扰能力强、响应迅速等优势成为了当前生物传感器的研究热点。硅材料自身具有高折射率和在近红外通讯波段低损耗等优良特性,并且由于互补金属氧化物半导体(complementary metal oxide semiconductor,CMOS)工艺和片上集成技术的快速发展,硅基光子晶体生物传感器不论在工作性能还是在制作成本和规模上都具有独特优势,拥有巨大的研究价值和广阔的市场潜力。本文系统介绍了近期硅基光子晶体结构高性能生物传感器的研究进展并对未来发展做了展望。展开更多
Silica-based fiber tips are used in a variety of spectroscopic, micro- or nano-scopic optical sensor applications and photonic micro-devices. The miniaturization of optical sensor systems and the technical implementat...Silica-based fiber tips are used in a variety of spectroscopic, micro- or nano-scopic optical sensor applications and photonic micro-devices. The miniaturization of optical sensor systems and the technical implementation using optical fibers can provide new sensor designs with improved properties and functionality for new applications. The selective-etching of specifically doped silica fibers is a promising method in order to form complex photonic micro structures at the end or within fibers such as tips and cavities in various shapes useful for the all-fiber sensor and imaging applications. In the present study, we investigated the preparation of geometrically predefined, nanoscaled fiber tips by taking advantage of the dopant concentration profiles of highly doped step-index fibers. For this purpose, a gas phase etching process using hydrofluoric acid （HF） vapor was applied. The shaping of the fiber tips was based on very different etching rates as a result of the doping characteristics of specific optical fibers. Technological studies on the influence of the etching gas atmosphere on the temporal tip shaping and the final geometry were performed using undoped and doped silica fibers. The influence of the doping characteristics was investigated in phosphorus-, germanium-, fluorine- and boron-doped glass fibers. Narrow exposed as well as protected internal fiber tips in various shapes and tip radiuses down to less than 15 nm were achieved and characterized geometrically and topologically. For investigations into surface plasmon resonance effects, the fiber tips were coated with nanometer-sized silver layers by means of vapour deposition and finally subjected to an annealing treatment.展开更多
文摘光子晶体是一种具有光子能带和带隙特性的空间周期性结构的人工电磁材料,因其具有的强大控光能力而在多种微纳光学功能器件中广泛应用,而光学生物传感器就是其中之一。光学生物传感器由于具有节能环保、抗干扰能力强、响应迅速等优势成为了当前生物传感器的研究热点。硅材料自身具有高折射率和在近红外通讯波段低损耗等优良特性,并且由于互补金属氧化物半导体(complementary metal oxide semiconductor,CMOS)工艺和片上集成技术的快速发展,硅基光子晶体生物传感器不论在工作性能还是在制作成本和规模上都具有独特优势,拥有巨大的研究价值和广阔的市场潜力。本文系统介绍了近期硅基光子晶体结构高性能生物传感器的研究进展并对未来发展做了展望。
文摘Silica-based fiber tips are used in a variety of spectroscopic, micro- or nano-scopic optical sensor applications and photonic micro-devices. The miniaturization of optical sensor systems and the technical implementation using optical fibers can provide new sensor designs with improved properties and functionality for new applications. The selective-etching of specifically doped silica fibers is a promising method in order to form complex photonic micro structures at the end or within fibers such as tips and cavities in various shapes useful for the all-fiber sensor and imaging applications. In the present study, we investigated the preparation of geometrically predefined, nanoscaled fiber tips by taking advantage of the dopant concentration profiles of highly doped step-index fibers. For this purpose, a gas phase etching process using hydrofluoric acid （HF） vapor was applied. The shaping of the fiber tips was based on very different etching rates as a result of the doping characteristics of specific optical fibers. Technological studies on the influence of the etching gas atmosphere on the temporal tip shaping and the final geometry were performed using undoped and doped silica fibers. The influence of the doping characteristics was investigated in phosphorus-, germanium-, fluorine- and boron-doped glass fibers. Narrow exposed as well as protected internal fiber tips in various shapes and tip radiuses down to less than 15 nm were achieved and characterized geometrically and topologically. For investigations into surface plasmon resonance effects, the fiber tips were coated with nanometer-sized silver layers by means of vapour deposition and finally subjected to an annealing treatment.
