单根金纳米锥的空间分辨等离激元特性  

Spatially Resolved Plasmonic Properties of Single Gold Nanocone

作　　者：黄冉 王文涛 徐芳芳 胡煜辉 张家明 陈永辉 薛海舟 段敬来[1,2,3,4] Ran HUANG;Wentao WANG;Fangfang XU;Yuhui HU;Jiaming ZHANG;Yonghui CHEN;Haizhou XUE;Jinglai DUAN(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Advanced Energy Science and Technology Guangdong Laboratory,Huizhou 516000,Guangdong,China;Huizhou Research Center of Ion Sciences,Huizhou 516000,Guangdong,China)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学核科学与技术学院,北京100049 [3]先进能源科学与技术广东省实验室,广东惠州516000 [4]惠州离子科学中心,广东惠州516000

出　　处：《原子核物理评论》2023年第1期99-105,共7页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(U1932210,1200527011975114)。

摘　　要：具有不对称形状和渐变尺寸的纳米锥在宽光谱响应方面具有广阔的应用前景。其中,单根纳米锥在表面等离激元引起的吸收/散射增强以及表面增强光谱等方向应用潜力巨大。在本工作中,我们利用快重离子辐照模板,再通过径迹蚀刻和电沉积工艺成功制备出直径渐变的单根金纳米锥结构。随后,利用扫描电子显微镜、透射电子显微镜和光学暗场成像对金纳米锥进行了形貌和结构表征。进一步的暗场散射光谱表明,单根金纳米锥具有良好的宽带响应特性和多种偏振模式。同时,FDTD(时域有限差分)数值模拟结果表明,宽带等离激元响应主要源于单根金纳米锥直径的渐变和其导致的表面等离激元共振模式的渐变。本项工作为制备高质量的金纳米锥提供了一种创新的方法,也为深入研究单根金属纳米锥的宽带响应特性提供了较为系统的理论和实验证据。Nanocones with asymmetric shapes and linearly reduced sizes possess a huge application prospect in the field of wide spectrum response.Single nanocones have great potential for the enhanced absorption/scattering and for the surface-enhanced spectroscopy caused by the excitation of surface plasmon.In this work,free-standing single gold nanocones with gradient diameter were fabricated by swift heavy ion irradiation on polymeric templates,followed by latent track etching and electrodeposition processes.The morphology and structure characterizations were performed,included scanning electron microscopy,transmission electron microscopy and optical dark-field imaging.Further dark-field scattering spectrometry results showed that the single gold nanocones have broadband response and multiple polarization modes.In addition,FDTD(the finite-difference time-domain)simulations revealed the mechanisms beneath the broadband plasmonic responses,which are attributed to the variation of surface plasmon resonance modes as a function of the gradually changed diameters of gold nanocone.This work provides an innovative method for the fabrication of high-quality gold nanocones,and also provides systematic theoretical and experimental evidence for the in-depth study of the broadband response properties of single metallic nanocones.

关 键 词：离子径迹 纳米锥 宽光谱响应 表面等离激元共振 

分 类 号：O571.33[理学—粒子物理与原子核物理]