摘要
半峰全宽(FWHM)是影响传感器性能的重要因素,为了提高表面等离子体共振传感器的品质因数,提出了一种光栅辅助超窄带多光谱等离子体共振传感器结构。该结构由周期性交替的SiO_(2)与Au矩形纳米柱构成,并置于SiO_(2)/Al_(2)O_(3)薄膜层上。利用全矢量有限元法对该结构的传输特性及传感特性进行数值仿真,分析了结构参数及入射光偏振态对FWHM和传感特性的影响。仿真结果表明,在800~1100 nm波长范围内,该传感器的传输谱存在两个由光栅衍射及等离子体共振形成的凹点,相应的FWHM分别为0.35 nm及0.59 nm,折射率灵敏度分别为525.7 nm/RIU、475.7 nm/RIU,品质因数分别为1502.00 RIU^(-1)和806.27 RIU^(-1),在生物检测、药物筛选、膜生物学等领域具有潜在的应用前景。
Full width at half maximum(FWHM)is an important factor affecting the performance of the sensor.In order to improve the quality factor of the surface plasmon resonance sensor,a gratingassisted ultranarrow band multispectral plasmon resonance sensor structure is proposed in this paper.The structure is composed of periodically alternating SiO_(2) and Au rectangular nanorods and is placed on the SiO_(2)/Al_(2)O_(3) thin film layer.The full vector finite element method is used to simulate the optical transmission and sensing characteristics,and the effects of structural parameters and polarization state of incident light on FWHM and sensing characteristics are analyzed.The simulation results show that in the wavelength range of 800-1100 nm,there are two dips formed by plasma resonance and dielectric grating in the transmission spectrum of the structure.The corresponding FWHM can reach 0.35 nm and 0.59 nm,respectively.The refractive index sensitivity is 525.7 nm/RIU and 475.7 nm/RIU,respectively.The figure of merit is 1502.00 RIU^(−1) and 806.27 RIU^(−1),respectively,which had potential applications in biological detection,drug screening,membrane biology and other fields.
作者
钟旭
伍铁生
王学玉
张慧仙
刘智慧
杨丹
杨祖宁
刘岩
刘锐
Zhong Xu;Wu Tiesheng;Wang Xueyu;Zhang Huixian;Liu Zhihui;Yang Dan;Yang Zuning;Liu Yan;Liu Rui(Key Laboratory of Wireless Broadband and Signal Processing,School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China;School of Electronic Engineering Bupt,Beijing University of Posts and Telecommunications,Beijing 100876,China;Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,Shenzhen University,Shenzhen 518060,Guangdong,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第11期183-190,共8页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61805051)
广西自然科学基金(2018JJB170035,2018AD19071,2019GXNSFFA245002,2020JJA170047)
广西无线宽带与信号处理重点实验室(GXKL06190118,GXKL06160102)。
关键词
光栅
表面等离子体共振
半峰全宽
折射率传感
gratings
surface plasmon resonance
full width at half maximum
refractive index sensing
