本文關(guān)鍵詞：基于表面等離激元的光鑷與拉曼增強(qiáng)技術(shù)研究　出處：《深圳大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 表面等離激元 光鑷 表面增強(qiáng)拉曼散射

【摘要】：表面等離激元(Surface Plasmon Polariton,SPP)是金屬表面自由電子與入射光子相互耦合、集體振蕩產(chǎn)生的表面電磁共振模式。由于SPP具有的表面電場(chǎng)局域、增強(qiáng)等特性,使其在SPP光鑷操控、表面增強(qiáng)拉曼散射、SPP納米刻蝕以及超分辨顯微成像等領(lǐng)域取得令人矚目的研究成果。表面等離激元場(chǎng)與金屬納米結(jié)構(gòu)相互作用時(shí),會(huì)使電磁場(chǎng)高度局域并產(chǎn)生增強(qiáng)效果。SPP在納米尺度空間的電磁場(chǎng)增強(qiáng)效應(yīng)增加了光學(xué)梯度力,從而實(shí)現(xiàn)對(duì)納米尺度樣品的精確操縱,已逐漸成為一個(gè)非常重要的前沿研究方向。SPP超高的電磁場(chǎng)強(qiáng)度和納米級(jí)別的空間尺寸使其在微弱信號(hào)增強(qiáng)、超分辨成像等方面擁有廣泛的應(yīng)用前景,表面增強(qiáng)拉曼光譜(SERS)技術(shù)即是利用金屬納米結(jié)構(gòu)的電磁場(chǎng)局域能力和增強(qiáng)能力實(shí)現(xiàn)拉曼信號(hào)的增強(qiáng)。SPP光鑷和SERS技術(shù)是兩個(gè)具有共同研究基礎(chǔ)的研究領(lǐng)域。在本文中,我們?cè)谠敿?xì)介紹了表面等離激元基本原理的基礎(chǔ)上,首先針對(duì)激光光鑷目前存在的問(wèn)題,展開了基于全光調(diào)控的聚焦型動(dòng)態(tài)表面等離激元光鑷技術(shù),利用SPP光鑷實(shí)現(xiàn)了對(duì)半導(dǎo)體納米線在平面內(nèi)的捕獲與操控,實(shí)現(xiàn)了納米線結(jié)構(gòu)的搭建。其次,基于SPP近場(chǎng)能量增強(qiáng)效應(yīng)展開了分子的SERS增強(qiáng)研究,將三種不同偏振對(duì)金屬顆�！饘倌ば虶ap結(jié)構(gòu)增強(qiáng)效果在理論上進(jìn)行比較,并在實(shí)驗(yàn)上進(jìn)行了SERS光譜測(cè)量,揭示了此類型Gap結(jié)構(gòu)的增強(qiáng)機(jī)理。本論文所涉及的主要研究?jī)?nèi)容如下:1.根據(jù)表面等離激元的發(fā)展背景,結(jié)合表面等離激元的應(yīng)用以及本論文的主要研究?jī)?nèi)容,簡(jiǎn)要介紹了表面等離激元在光鑷技術(shù)領(lǐng)域的研究現(xiàn)狀和發(fā)展前景,并對(duì)SPP在拉曼增強(qiáng)領(lǐng)域的研究工作展開了初步介紹。2.系統(tǒng)介紹了表面等離激元和局域表面等離激元(LSP)的基本理論,分析了表面等離激元場(chǎng)與納米結(jié)構(gòu)作用力,并建立了納米結(jié)構(gòu)受力的理論模型。3.基于建立的納米結(jié)構(gòu)在SPP場(chǎng)中的受力模型,理論上分析了聚焦表面等離激元場(chǎng)對(duì)納米線結(jié)構(gòu)的作用力,并與傳統(tǒng)光鑷中的受力做了對(duì)比分析;搭建了基于線偏光緊聚焦激發(fā)表面等離激元場(chǎng)的光鑷系統(tǒng),進(jìn)一步通過(guò)調(diào)控線偏振光的偏振方向以及激發(fā)SPP場(chǎng)的位置,實(shí)現(xiàn)了對(duì)氧化鋅(ZnO)納米線的動(dòng)態(tài)和定向操控。4.基于緊聚焦激發(fā)的SPP場(chǎng)與金屬納米顆粒的LSP雜化耦合,可以在納米結(jié)構(gòu)與金屬膜之間的Gap區(qū)域內(nèi)產(chǎn)生納米尺寸的局域增強(qiáng)電場(chǎng),利用該Gap結(jié)構(gòu)可以進(jìn)一步實(shí)現(xiàn)對(duì)拉曼信號(hào)的增強(qiáng);研究了不同偏振光束在Gap結(jié)構(gòu)中所激發(fā)SPP耦合場(chǎng)的場(chǎng)局域與增強(qiáng)能力,并實(shí)驗(yàn)驗(yàn)證了該結(jié)構(gòu)對(duì)分子SERS信號(hào)的影響。
[Abstract]:Surface Plasmon Polaritonne (SPP) is a coupling of free electrons and incident photons on a metal surface. The surface electromagnetic resonance mode produced by collective oscillations. Due to the characteristics of surface electric field localization and enhancement, SPP is manipulated in SPP optical tweezers and enhanced Raman scattering on the surface. Remarkable results have been obtained in the fields of SPP nanocrystalline etching and superresolution microimaging. The electromagnetic field enhancement effect of SPP in nanoscale space increases the optical gradient force and realizes the accurate manipulation of nanoscale samples. SPP has gradually become a very important frontier research direction. SPP has been widely used in weak signal enhancement and super-resolution imaging due to its ultra-high magnetic field intensity and nanoscale space size. Surface enhanced Raman spectroscopy (SERS). The technology is to utilize the electromagnetic field local ability and enhancement ability of metal nanostructure to realize the enhancement of Raman signal. SPP optical tweezers and SERS technology are two research fields which have common research foundation. On the basis of the detailed introduction of the basic principle of the surface isopitons, we first develop the focused dynamic surface isobaric optical tweezers technology based on all-optical regulation, aiming at the existing problems of laser optical tweezers. SPP optical tweezers are used to capture and manipulate semiconductor nanowires in the plane, and the structure of nanowires is constructed. Based on the near field energy enhancement effect of SPP, the SERS enhancement of molecules was studied. The enhancement effects of three different polarizations on the structure of metal particle metal film Gap were compared theoretically. The enhancement mechanism of this type of Gap structure is revealed by SERS spectroscopy. The main research contents in this thesis are as follows: 1. According to the development background of surface isoexcitators. Combined with the application of surface isophosphors and the main research contents of this thesis, the research status and development prospects of surface isophosphors in optical tweezers are briefly introduced. The basic theories of surface and local surface isophosphors are introduced. 2. In this paper, the interaction force between the surface isoexcitator field and the nanostructure is analyzed, and the theoretical model of the nanostructure force is established. 3. Based on the established model of the nanostructure force in the SPP field. The forces acting on nanowire structures by the focusing surface isoexcitator field are theoretically analyzed and compared with those in conventional optical tweezers. An optical tweezers system based on linearly polarized light compact focusing excitation surface isophosphor field is built to further regulate the polarization direction of linear polarized light and the position of excitation SPP field. The dynamic and directional manipulation of ZnO nanowires is realized. 4. The LSP hybrid coupling of metal nanoparticles and SPP field based on compact focusing excitation is achieved. The local enhanced electric field of nanometer size can be generated in the Gap region between the nanostructure and the metal film, and the Raman signal can be further enhanced by using the Gap structure. The field localization and enhancement ability of SPP coupling field excited by different polarized light beams in Gap structure are studied and the effect of the structure on the molecular SERS signal is verified experimentally.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O485;TB383.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 豆秀婕;閔長(zhǎng)俊;張聿全;袁小聰;;表面等離激元光鑷技術(shù)[J];光學(xué)學(xué)報(bào);2016年10期

2 霍鑫;潘石;吳世法;;近場(chǎng)光鑷技術(shù)研究新進(jìn)展[J];光學(xué)技術(shù);2007年02期

，

本文編號(hào)：1397669