摘要
提出了一种具有V形开口的三维纳米银圆管阵列结构,这种结构可被应用于折射率传感器中。利用时域有限差分法对V形开口纳米银圆管阵列的透射特性进行研究。结果表明:当入射光的电场偏振方向垂直于开口的方向时,在可见光和近红外波段的透射光谱上存在3个共振透射峰,分别对应着一个传导型表面等离子体共振(PSPR)模式和两个不同机理的局域表面等离子体共振(LSPR)模式。讨论了阵列周期、圆管直径、圆管高度和圆管顶部缝隙大小等参数对透射峰的波长以及半峰全宽(FWHM)的影响。通过调谐结构参数,优化V形开口纳米银圆管阵列的LSPR传感性能,得到最大高达13.2的品质因子。
A periodic array of V-type opened silver tubes is proposed to serve as a refractive index sensor. The transmission properties of this structure are investigated via the finite-difference time domain method. Simulation results show that the transmission spectra of this structure have three tunable peaks when the electric field of the incident light is perpendicular to the gap. The peaks are induced by the propagating surface plasmon resonance（PSPR） at the silver-quartz interface and two different localized surface plasmon resonances（LSPR）, respectively.The influences of structure parameters, such as array period, the tube diameter, height and gap width, on the transmission peak wavelength and full-width at half-maximun（FWHM） are analyzed By optimizing the structure,it can serve as a LSPR sensor with a figure of merit of 13.2.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第5期202-208,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(11374376,11174374)
广东省教育厅重点创新项目(2012CXZD0001)
关键词
表面光学
传感器
品质因子
时域有限差分法
局域表面等离子体共振
optics at surfaces
sensors
figure of merit
finite difference time domain
localized surface plasmon resonance
