非对称银纳米柱的光学特性及制备  

Optical Properties and Preparation of Asymmetric Silver Nanorods

作　　者：陈进 倪海彬 吴文杰 葛益娴[1] 王婷婷[1] 倪波 卢林林 常建华[1] Chen Jin;Ni Haibin;Wu Wenjie;Ge Yixian;Wang Tingting;Ni Bo;Lu Linlin;Chang Jianhua(School of Electronics and Information Engineering,Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China;Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing University of Information Science&Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]南京信息工程大学江苏省大气环境与装备技术协同创新中心,江苏南京210044

出　　处：《光学学报》2024年第22期210-219,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61605082,61875089)。

摘　　要：提出了一种新颖的非对称银纳米柱结构,并采用时域有限差分(FDTD)法对其激发的表面等离子体共振(SPR)模式进行了数值模拟。通过磁控溅射和离子束刻蚀技术,成功制备了该单层非对称银纳米柱结构,并通过透射光谱分析其光学特性。实验结果表明,该结构对环境折射率变化敏感,在生化物质的现场快速检测中显示出巨大潜力。基于这一发现,进一步设计并模拟了双层非对称银纳米柱结构,确认了其对偏振光的高度敏感性。这些研究成果为开发新型生物化学传感器提供了重要的理论和实验基础。Objective Surface plasmons have attracted significant attention due to their broad applications in nanophotonics,biology,and spectroscopy.Among these,polarization-sensitive nanostructures are especially critical in biology and communications.Asymmetric structures,in particular,offer an effective means to achieve polarization-sensitive responses.While considerable research has focused on nanostructures,individual asymmetric nanostructures have not been studied as extensively.In this study,we investigate the optical properties of single asymmetric silver nanopillars,examining their polarization-dependent characteristics through both simulation and experimental methods.In addition,we introduce a double-layer asymmetric silver nanopillar structure,expanding the potential applications and functionality of these nanostructures.Methods We utilize the finite-difference time-domain(FDTD)method to simulate the transmission spectra of asymmetric silver nanopillar structures,evaluating the influence of various parameters on their optical properties.Specifically,we analyze the effects of variations in height,diameter,and tilt angles on the optical behavior of these nanopillars with results shown in Fig.5.Mode field analysis is conducted to explore the surface plasmon modes excited by these structures,as shown in Fig.4.The asymmetric silver nanopillar structures are fabricated on quartz substrates using magnetron sputtering for silver deposition,followed by ion beam etching.Submicron microsphere spin-coating is utilized as a masking technique,with details provided in Fig.7.Transmission spectroscopy is then employed to analyze the relationship between the optical properties and geometric parameters of the fabricated nanopillars,as shown in Fig.11.This analysis further investigates the potential application in environmental refractive index change sensing.Results and Discussions We provide details of the simulated transmission spectra of asymmetric silver nanopillar structures under varying periodic conditions,as shown in Fig.2.

关 键 词：表面等离激元共振 非对称银纳米柱 折射率传感 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]