光电子快报(英文版), 2017, 13 (1): 5, Published Online: Sep. 13, 2018
Investigation on refractive index sensing of single silver nanoparticle at tightly focused light illumination
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.
SHEN Si, WANG Xiang-hui, SUN Jing-wei, FAN Fei, CHANG Shengjiang. Investigation on refractive index sensing of single silver nanoparticle at tightly focused light illumination[J]. 光电子快报(英文版), 2017, 13(1): 5.