Localized Surface Plasmon Resonance of Single Silver Nano-Hemisphere

2013 ◽  
Vol 818 ◽  
pp. 137-140
Author(s):  
Rui Li ◽  
Kun Liu ◽  
Shi Pan ◽  
Jian Hua Ding

In this work, we use 3D finite difference time domain (3D-FDTD) to calculate the plasmon resonance effect for a single silver hemisphere in which the palsmon line shape have distinct peaks when the particles are located on a glass substrate. The dependence of the resonance on hemisphere size and the ratio of height over radius are characterized, and it is found that the surface interface effect played an important role on the plasman resonace effect for a single silver hemisphere.

2019 ◽  
Vol 41 (1) ◽  
pp. 45-50
Author(s):  
Ranjit Singh ◽  
Sanjeev Dewra

Abstract The performance of localized surface plasmon resonance-based sensor with and without Bragg grating by using finite difference time domain method is evaluated with nanoparticles used at the tip of optical fiber. The proposed sensor has been analyzed in terms of refractive index (RI) sensitivity and signal-to-noise ratio (SNR). It is observed that the RI sensitivity of surface plasmon resonance sensor is 240 nm/RIU with and without grating as RI of surrounding varies from 1.4 to 1.5. It is found that the value of SNR is 0.875 RIU→1 without grating and 2.75 RIU→1 with grating. So there is an improvement in the SNR when the Bragg grating is inscribed within the core of the fiber.


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