太赫茲波段納米顆粒的表面增強(qiáng)拉曼散射效應(yīng)
發(fā)布時(shí)間：2018-12-30 13:43
【摘要】：太赫茲波譜處于以經(jīng)典理論為基礎(chǔ)的電子學(xué)和以量子理論為基礎(chǔ)的光子學(xué)之間過渡區(qū)域,從而它的性質(zhì)就呈現(xiàn)出一系列特殊性,可以應(yīng)用在醫(yī)學(xué)、成像、通信和天文等諸多領(lǐng)域。尤其是在生物大分子探測上有著突出的應(yīng)用優(yōu)勢,與表面增強(qiáng)拉曼散射(Surface-enhanced Raman Scattering,SERS)技術(shù)在生物大分子檢測方面有著很多的共同點(diǎn)。將太赫茲波與SERS結(jié)合起來形成一種基于SERS的太赫茲探測技術(shù),在大分子檢測過程中有著明顯的優(yōu)勢,不僅可以描述大分子的分子結(jié)構(gòu)而且也可以對其濃度進(jìn)行檢測。以SERS基底組成部分的金屬和半導(dǎo)體納米結(jié)構(gòu)的表面電磁增強(qiáng)效果作為論文命題的研究重點(diǎn),使用時(shí)域有限差分(Finite Difference Time Domain,FDTD)方法對金屬和半導(dǎo)體納米結(jié)構(gòu)的表面電磁增強(qiáng)效果進(jìn)行了數(shù)值計(jì)算模擬。本論文對太赫茲技術(shù)與SERS技術(shù)相結(jié)合的命題進(jìn)行了以下研究:1)SERS及其拉曼散射基礎(chǔ)理論。研究分析了拉曼散射的形成原理,SERS的增強(qiáng)機(jī)理。針對論文命題對太赫茲波技術(shù)和SERS技術(shù)相結(jié)合的基礎(chǔ)模型,以金屬納米顆粒結(jié)構(gòu)為例,對SERS基底的增強(qiáng)機(jī)理進(jìn)行了分析。2)FDTD的原理分析及軟件FDTD Solutions具體應(yīng)用的設(shè)置研究。研究分析了描述電磁場的Maxwell方程組在時(shí)域的差分形式,對各個(gè)關(guān)鍵點(diǎn)進(jìn)行了分析。介紹了以FDTD為基礎(chǔ)的軟件FDTD Solutions的仿真設(shè)置。3)金屬和半導(dǎo)體納米顆粒在太赫茲波段的SERS效應(yīng)研究。研究分析了金屬和半導(dǎo)體納米顆粒結(jié)構(gòu)在太赫茲波段的近場電磁增強(qiáng)分布情況,進(jìn)而得到SERS增強(qiáng)因子,從基礎(chǔ)上闡明了太赫茲波技術(shù)與SERS技術(shù)相結(jié)合的原理。實(shí)驗(yàn)中對金和銻化銦納米顆粒“熱點(diǎn)”處的近場電磁增強(qiáng)效果進(jìn)行了計(jì)算仿真,得到了“熱點(diǎn)”處的SERS增強(qiáng)因子分別可以達(dá)到106和109。
[Abstract]:The terahertz spectrum is in the transition region between electronics based on classical theory and photonics based on quantum theory, so its properties show a series of particularities, which can be used in medicine and imaging. Communications and astronomy and many other fields. Especially in the detection of biological macromolecules, there are many common points with surface enhanced Raman scattering (Surface-enhanced Raman Scattering,SERS) technology in the detection of biological macromolecules. Combining terahertz wave with SERS to form a terahertz detection technology based on SERS, it has obvious advantages in the detection of macromolecules. It can not only describe the molecular structure of macromolecules but also detect their concentration. Based on the surface electromagnetic enhancement effect of metal and semiconductor nanostructures based on SERS substrate as the focus of the thesis, the finite-difference time-domain (Finite Difference Time Domain, is used. The surface electromagnetic enhancement effect of metal and semiconductor nanostructures was numerically simulated by FDTD method. In this thesis, the proposition of combining terahertz technique with SERS technique is studied as follows: 1) SERS and its Raman scattering theory. The formation principle of Raman scattering and the enhancement mechanism of SERS are studied and analyzed. Aiming at the basic model of combining THz wave technology with SERS technology, the strengthening mechanism of SERS substrate is analyzed by taking the metal nanoparticles as an example. 2) the principle analysis of FDTD and the setting up of the application of software FDTD Solutions are studied. The difference form of Maxwell equations describing electromagnetic field in time domain is studied and the key points are analyzed. The simulation setup of FDTD Solutions software based on FDTD is introduced. 3) the SERS effect of metal and semiconductor nanoparticles in terahertz band is studied. The near field electromagnetic enhancement distribution of metal and semiconductor nanoparticles in terahertz band is studied and the SERS enhancement factor is obtained. The principle of combining terahertz wave technology with SERS technique is explained. In the experiment, the near field electromagnetic enhancement effect of gold and indium antimonide nanoparticles at "hot spot" is simulated, and the SERS enhancement factor at "hot spot" can reach 106 and 109 respectively.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O441.4
本文編號：2395657
[Abstract]:The terahertz spectrum is in the transition region between electronics based on classical theory and photonics based on quantum theory, so its properties show a series of particularities, which can be used in medicine and imaging. Communications and astronomy and many other fields. Especially in the detection of biological macromolecules, there are many common points with surface enhanced Raman scattering (Surface-enhanced Raman Scattering,SERS) technology in the detection of biological macromolecules. Combining terahertz wave with SERS to form a terahertz detection technology based on SERS, it has obvious advantages in the detection of macromolecules. It can not only describe the molecular structure of macromolecules but also detect their concentration. Based on the surface electromagnetic enhancement effect of metal and semiconductor nanostructures based on SERS substrate as the focus of the thesis, the finite-difference time-domain (Finite Difference Time Domain, is used. The surface electromagnetic enhancement effect of metal and semiconductor nanostructures was numerically simulated by FDTD method. In this thesis, the proposition of combining terahertz technique with SERS technique is studied as follows: 1) SERS and its Raman scattering theory. The formation principle of Raman scattering and the enhancement mechanism of SERS are studied and analyzed. Aiming at the basic model of combining THz wave technology with SERS technology, the strengthening mechanism of SERS substrate is analyzed by taking the metal nanoparticles as an example. 2) the principle analysis of FDTD and the setting up of the application of software FDTD Solutions are studied. The difference form of Maxwell equations describing electromagnetic field in time domain is studied and the key points are analyzed. The simulation setup of FDTD Solutions software based on FDTD is introduced. 3) the SERS effect of metal and semiconductor nanoparticles in terahertz band is studied. The near field electromagnetic enhancement distribution of metal and semiconductor nanoparticles in terahertz band is studied and the SERS enhancement factor is obtained. The principle of combining terahertz wave technology with SERS technique is explained. In the experiment, the near field electromagnetic enhancement effect of gold and indium antimonide nanoparticles at "hot spot" is simulated, and the SERS enhancement factor at "hot spot" can reach 106 and 109 respectively.
【學(xué)位授予單位】：天津理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O441.4
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