Bolometric effect in a waveguide-integrated graphene photodetector

Graphene is an alternative material for photodetectors owing to its unique properties.These include its uniform absorption of light from ultraviolet to infrared and its ultrahigh mobility for both electrons and holes.Unfortunately,due to the low absorption of light,the photoresponsivity of graphene-based photodetectors is usually low,only a few milliamps per watt.In this letter,we fabricate a waveguide-integrated graphene photodetector.A photoresponsivity exceeding0.11 A·W ~(-1) is obtained which enables most optoelectronic applications.The dominating mechanism of photoresponse is investigated and is attributed to the photo-induced bolometric effect.Theoretical calculation shows that the bolometric photoresponsivity is 4.6 A·W ~(-1).The absorption coefficient of the device is estimated to be 0.27 dB·μm ~(-1).     

运用图示思维提升化学素养的教学案例研究

通过教学实践,引导学生运用图示思维,学习化学学科核心知识,提高获取信息,分析问题和解决问题的能力,深入理解化学学科本质,有效提升化学素养。     

Design and fabrication of multi-channel photodetector array monolithic with arrayed waveguide grating

We have provided optical simulations of the evanescently coupled waveguide photodiodes integrated with a 13-channels AWGs. The photodiode could exhibit high internal efficiency by appropriate choice of layers geometry and refractive index. Aseamless joint structure has been designed and fabricated for integrating the output waveguides of AWGs with the evanescently coupled waveguide photodiode array. The highest simulation quantum efficiency could achieve 92% when the matching layer thickness of the PD is 120 nm and the insertion length is 2 μm. The fabricated PD with 320-nm-thick matching layer and 2-μm-length insertion matching layer present a responsivity of 0.87 A/W.     

对室内空气污染的探讨

空气污染问题越来越受到整个社会的关注,本文旨在阐述由室内建材造成的空气污染现状、主要化学污染物及常用防治方法。     

西部校园网应用网络教育资源的实践

网络及网络资源的有效利用，将是缩短西部与发达地区教育水平差异的最佳途径。本文介绍了目前中学西部校园网应用网络教育资源的现状及在新疆克拉玛依市一中利用网络教育资源进行研究化学教学的课例。     

微型有机化学性质实验研究

有机化学作为一门实验科学,是我国中等教育中不可缺少的组成部分。实验教学的改革势必首当其冲,成为化学教育改革成败的关键。     

食品营养强化剂牛磺酸

介绍了牛磺酸的生物学功能与应用、提取与合成的方法及其发展现状与市场前景等。     

有机小分子电致发光研究进展

有机电致发光具有发光亮度和发光效率高,材料易加工等传统的无机和液晶显示材料无可比拟的优点,并且可以通过改变分子结构或掺杂调谐发光的颜色.本文评述了近年来有机小分子电致发光材料的研究进展,简要介绍了有机电致发光的原理及其广阔的应用前景.     

基于实验探究的整合教学模式案例研究

以“二氧化碳的性质和用途”为教学案例,设计了家庭实验和分组实验等实验探究活动,改进了传统的演示实验与板书,并对上述内容进行了整合研究,形成了基于实验探究的整合教学模式。     

全程渗透全程培养全面发展师范生的化学教育教学能力及素质

本文从目前高师化学系学生教育教学素质和能力的培养模式以及教学论系列课程的教学改革实践的现状及其需要出发,在调查研究的基础上提出了全程渗透全程培养全面发展师范生的化学教育教学能力及素质的培养模式及基本策略。