1 中国科学院, 重庆绿色智能研究院, 嘉兴工业设计工程中心, 浙江 嘉兴 314000
2 南开大学物理科学学院, 天津 300071
基于局域表面等离子共振(Local Surface Plasmon Resonance,LSPR)原理, 本文利用有限元法研究了银圆锥纳米阵列共振波长的调控方法。使用COMSOL仿真软件模拟银圆锥纳米阵列表面附近的平均电场强度随入射光的变化, 结果表明其共振波长与阵列周期和环境折射率有关。圆锥阵列周期p的增加, 导致共振波长发生红移。两者间近似呈线性关系, 可根据有效波长理论拟合得到阵列周期与共振波长间的线性关系式: p=0.97λ+21.244。圆锥半径r和高度h的变化对共振波长无影响。周期p为560 nm时, r=120 nm, h=200 nm, 共振波长峰高达到最值。环境介质折射率增加导致共振波长红移, 峰高减小, 并且出现多个共振波峰。
银圆锥纳米阵列 局域表面等离子体共振 有限元分析 COMSOL仿真 Silver cone nanoarrays Local surface plasmon enhancement Finite Element analysis COMSOL simulation
Author Affiliations
Abstract
School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore
Infrared photodetectors have been used extensively in biomedicine, surveillance, communication and astronomy. However, state of the art technology based on III-V and II-VI compounds still lacks excellent performance for high-temperature operation. Surface plasmon polaritons (SPPs) have demonstrated their capability in improving the light detection from visible to infrared wave range due to their light confinement in subwavelength scale. Advanced fabrication techniques such as electron-beam lithography (EBL) and focused ion-beam (FIB), and commercially available numerical design tool like Finite-Difference Time-Domain (FDTD) have enabled rapid development of surface plasmon (SP) enhanced photodetectors. In this review article, the basic mechanisms behind the SP-enhanced photodetection, the different type of plasmonic nanostructures utilized for enhancement, and the reported SP-enhanced infrared photodetectors will be discussed.
Infrared photodetection plasmonic structures surface plasmon enhancement Opto-Electronic Advances
2019, 2(1): 180026
福建师范大学 物理与能源学院 福建省量子调控与新能源重点实验室, 福州 350117
用共沉淀法制备了β-NaYF4∶Er3+纳米颗粒.通过化学还原法、晶种生长法分别制备银纳米立方颗粒及金纳米棒, 并将其掺杂到β-NaYF4∶2%Er3+纳米颗粒中形成复合体系, 利用表面等离子激元增强效应分别实现β-NaYF4∶Er3+上转换发光的激发和发射增强.当银纳米立方颗粒掺杂量为60 μL时, 上转换发光强度整体增强4.0倍; 当金纳米棒掺杂量为60 μL时, 上转换发光强度整体增强7.8倍.在此基础上, 将两种贵金属纳米颗粒同时掺杂到β-NaYF4∶Er3+纳米颗粒材料中, 实现了该材料上转换发光激发和发射双增强, 上转换发光强度增强了16.0倍.
上转换 表面等离子激元增强 光谱 银纳米立方颗粒 金纳米棒 β-NaYF4∶Er3+纳米颗粒 Upconversion Surface plasmon enhancement Spectrum Ag nanocubes Au nanorods β-NaYF4∶Er3+ nanoparticles
