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类型 基础研究 预答辩日期 2017-12-03
开始(开题)日期 2015-03-11 论文结束日期 2017-10-31
地点 四牌楼校区显示中心一楼会议中心 论文选题来源 非立项    论文字数 7 (万字)
题目 表面等离激元在光电探测中的应用及热电子机理研究
主题词 表面等离激元,热电子,光电探测,完美吸收体,偏振敏感
摘要 作为光电子技术领域的关键核心元件之一,光电探测器因其响应快、精度高、体积小、功耗低及非接触测量等优点,被广泛应用于国计民生的各个领域。但因自身探测原理的限制,传统光电探测器只能分辨光强信息,无法单独分辨入射光的波长、偏振、入射角度等信息,需要与偏振片、滤色片、光栅等光学元件相结合才能实现,不利于光电探测向多功能化、集成化、芯片化的方向发展。因此,需要不断的提出新概念、新结构、新工艺、新材料来解决目前探测器发展过程中遇到的瓶颈与困难。表面等离激元光子学是随着纳米科学与技术发展而形成的一门新兴科学,主要研究亚波长金属纳米结构独特的光学特性及其在纳米尺寸上对光的操控。通过改变亚波长结构的形状、尺寸、材料、分布以及所处的介电环境可以对表面等离激元的共振波长、场增强因子、场分布、远场辐射等特性进行有效调控。因此表面等离激元在物理、化学、生物、光电子器件等众多领域都具有广泛的应用。 本论文的研究目的在于探索研究表面等离激元金属纳米结构及其热电子效应在新型光谱可调、偏振敏感光电探测器中的工作机理与应用可行性,在此基础上研究金属/介质或金属/半导体复合微纳结构的光电特性和结构优化。 本文主要围绕两个方面开展工作:一是利用表面等离激元结构调控不同波长和偏振态下的光透射/吸收;二是利用表面等离激元结构共振衰减产生的热电子实现光电探测响应光谱的拓宽。具体的研究工作包括以下几个方面: (1)研究了周期性亚波长金属光栅的狭缝内壁形状的变化对于不同偏振入射光的(TE/TM入射光)的透射影响以及透射消光比的影响,发现凸曲面内壁的狭缝光栅不仅具有较高的消光比,还具有较高的光透射率。同时提出利用周期性金属光栅与硅形成的复合结构实现在近红外波段的偏振敏感吸收,并详细研究了光栅结构参数对于吸收偏振消光比的影响,为后期实现基于硅基的近红外偏振敏感探测提供了理论基础和设计方案。 (2)设计出几种基于“亚波长金属光栅-介质层-金属基底”结构的多波段窄带完美吸收体。通过建立数值仿真模型,研究了完美吸收结构的多波段窄带吸收的成因,同时研究了结构参数和材料参数的变化,对于整体结构吸收光谱的影响。另外还设计了一种基于锥形纳米锥阵列的多层结构(ITO-ZnO-Au),实现了可见光范围内的宽波段吸收,并且利用阳极氧化铝工艺制备出此种结构,其实验吸收光谱与模拟结果吻合。 (3)研究了金纳米颗粒在拓展IGZO光电晶体管响应光谱中的作用,并且通过分析不同光照条件下瞬态光电流上升沿和下降沿的突变现象,从侧面验证了金纳米颗粒中的等离激元诱导热电子注入到了IGZO沟道中,并对其相应的现象做了理论解释。最后揭示了背栅电压对于热电子注入效率的影响规律,随着背栅电压的增强,热电子注入效率有上升的趋势。 (4)设计并实现了金纳米结构(颗粒和薄膜)与微米级硅金字塔的异质结近红外光电探测器,阐释了微米级硅金字塔结构和金纳米颗粒尺寸对于器件性能的影响规律。微米级硅金字塔结构相对平面硅基结构来说,增强了金纳米结构的光吸收,提高了光电转换效率。金纳米颗粒的大小不仅影响整体结构的光吸收,也影响热电子的注入效率,二者之间要均衡考虑才能实现最高光电转换效率。最后研究了入射光方向对于热电子注入效率的影响,并通过理论仿真给出相应的解释。
英文题目 The application and hot-electron mechanisms of suface plasmon in photodetection
英文主题词 Surface plasmon, hot electrons, photodetection, perfect absorbers, polarization-sensitive
英文摘要 Due to the properties of fast response, high resolution, low volume, low power consumption and non-contact measuring, photodetectors have been widely applied in many aspects of daily life and military field. But own to the limitation of the detection principle, the traditional photodetectors just can detect the intensity of the incident light and can’t detect the wavelength, polarization and angle of the incident light. They must combine with other optical elements, such as polarizers, color filters, or gratings, which impede the development of the photodetector system into the direction of multi-function, miniaturization, integration. So, it is urgent to put forward novel concept, structures, technology and materials to solve those problems in the field of photodetectors. Plasmonics is a new research area mainly focus on the investigation of the interaction between light and sub-wavelength metallic nanostructure. Surface plasmon resonance (SPR) is the resonant oscillation of conduction electrons at the interface between negative and positive permittivity material stimulated by incident light. The resonant wavelength, field enhancement factor, field distribution pattern are strongly dependent on the shape, size, materials and dielectric environment of the nanostrucutrue. Thus the surface plasmon have an extremely wide application in the field of Physics, Chemistry, Biology, and Opti-electric devices, etc. In this thesis, we aim to explore the work mechanism and potential feasibility of applying the surface plasmon nanostrucuture in the novel wavelength-resolution and polarization-sensitive photodetectors. On the above bases, we studied the optical and electrical properties of the metal /semiconductor nanostructures and metal/dielectric nanostructures. The thesis mainly focus on two aspects of research: (1) manipulation of the optical absorption or transmission by designing and fabricating different kinds of plasmonic nanostructures;(2)extend the response spectra of the photodetectors by utilizing the surface plamosn resonance induced hot electrons. The major achievements of the thesis are list as follows: 1. The influence of the shape of grating slit on the transmission spectra and extinction ratio under different polarized-light illumination was investigated. It is found that the convex shaped slit not only possesses high transmission but also have large extinction ratio. The absorption properties of Au grating/Si substrate structure under TM/TE polarized light incident in the near-infrared range were also investigated. 2. Design of several multiple narrowband perfect absorbers based on the “subwavelength metallic grating-dielectric-metallic substrate”. The optical properties, field distribution pattern and its formation mechanism were studied. In addition, a broadband absorbers based on the nanospikes array substrate was also designed and fabricated by the AAO method, the simulated absorption spectra agree well with the experimental results. 3. The photoresponse properties of the Au nanoparticles decorated IGZO TFT were investigated. The hot electron ejection process was demonstrate with a simple way by analyzing the variation of the I-T curve. The effect of backgate voltage on the hot electron ejection efficiency were also studied and find that the ejection efficiency increases with the increasing backgate voltage. 4. Design and fabrication of gold nanostructures/Si micro-pyramid Schottky near-infrared photodetectors based on wet chemical etching and film deposition method. The effect of the Au NPs size and the micro-pyramid structure on the devices performance were analyzed. The absorption and hot electron ejection efficiency both controlled by the Au NPs size and the micro-pyramid structure. Finally, the influence of the illumination direction on the hot electron ejection efficiency were investigated both experimentally and theoretically based on the Au film/Si micro-pyramid Schottky photodetectors. Keywords: Surface plasmon, hot electrons, photodetection, perfect absorbers, polarization-sensitive
学术讨论
主办单位时间地点报告人报告主题
电子科学与工程学院 2017.10.24 显示中心一楼会议室 梁建铮博士 智能光电整合架构
电子科学与工程学院 2014.5.16 金陵院123会议室 Yin xiaobo教授 When structured light meet structured matter——light-matter interaction at the nanoscale
电子科学与工程学院 2015.12.7 MEMS教育部重点实验室 潘安练教授 Badgap-Engineering based on single semiconductor nanostructure:From 1D to 2D system
电子科学与工程学院 2016.6.21 MEMS教育部重点实验室 段镶锋教授 2D Electronics: Opportunities, Challenges, and Outlets
王琦龙老师课题组 2017.5.22 显示中心一楼会议室 翟雨生 Novel Photodetectors based on plasmon induced hot electrons
王琦龙老师课题组 2015.5.26 显示中心一楼会议室 翟雨生 纳米间隙电极的介绍与工作进展
王琦龙老师课题组 2017.5.25 显示中心一楼会议室 翟雨生 关于光电器件研究的讨论
王琦龙老师课题组 2015.12.17 显示中心一楼会议室 翟雨生 等离激元器件中的数值模拟
     
学术会议
会议名称时间地点本人报告本人报告题目
2013中国光学学会学术年会 2013.8.15 湖南长沙 Study on the transmission properties of subwavelength metallic taper grating with different shape slit walls
ChinaNano 2013 2013.9.3 北京 Broadband extraordinary optical transmission of sub-wavelength metallic grating with parabolic wall
Meta2014 2014.5.21 新加坡 Photoluminescence intensity of CdSe/ZnS quantum
     
代表作
论文名称
Broadband extraordinary optical transmission of sub-wavelength metallic grating with parabolic wall
Study on the transmission properties of sub-wavelength metallic tapered gratings with different-shap
Experimental investigation of energy transfer between CdSe/ZnS quantum dots and different-sized gol
Multiple-band perfect absorbers based on the combination of Fabry-Perot resonance and the gap plasmo
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
赵永强 正高 教授 博导 西北工业大学
陈沁 正高 教授 博导 暨南大学
娄朝刚 正高 教授 博导 东南大学
夏军 正高 教授 博导 东南大学
恽斌峰 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
吴俊 副高 副教授 东南大学