SHEN Si,WANG Xiang-hui,SUN Jing-wei,FAN Fei,CHANG Sheng-jiang.Investigation on refractive index sensing of single silver nanoparticle at tightly focused light illumination[J].Optoelectronics Letters,2017,13(1):5-9 Investigation on refractive index sensing of single silver nanoparticle at tightly focused light illumination Author Name Affiliation SHEN Si  Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China  WANG Xiang-hui  Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China  SUN Jing-wei  Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China  FAN Fei  Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China  CHANG Sheng-jiang  Key Laboratory of Optical Information Science and Technology, Ministry of Education, Institute of Modern Optics, Nankai University, Tianjin 300071, China  Abstract:       Based on the generalized Mie theory, refractive index sensing characteristics of single silver nanoparticle respectively illuminated by tightly focused linearly-polarized and radially-polarized light beams are investigated. The spectra for localized surface plasmon resonances (LSPR) under different dielectric environments demonstrate that distinct dipolar and quadrupolar resonances can be always observed for the case of radial polarization, while there is only strong dipolar resonance for the case of linear polarization. The dipolar mode has a higher sensitivity. However, the figure of merit (FOM) for the quadrupolar resonance is much higher than that for the dipolar resonance, because the quadrupolar resonance has a narrower width. Hits: 3799 Download times: 0 View Full Text    Download reader