Adiabatic focusing of surface plasmon polaritons for label free detection of few molecules by means of Raman scattering

2009 ◽  
Author(s):  
F. De Angelis ◽  
G. Das ◽  
C. Liberale ◽  
P. Candeloro ◽  
F. Mecarini ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Label Free ◽  
Label Free Detection ◽  
Plasmon Polaritons

Adiabatic compression of surface plasmon polaritons for label-free few molecules detection by means of Raman scattering

2010 ◽  
Vol 87 (5-8) ◽  
pp. 1312-1314 ◽  
Author(s):  
F. De Angelis ◽  
G. Das ◽  
P. Candeloro ◽  
C. Liberale ◽  
F. Mecarini ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Adiabatic Compression ◽  
Label Free ◽  
Plasmon Polaritons

scholarly journals Label-free detection of single nanoparticles with disordered nanoisland surface plasmon sensor

2021 ◽  
Author(s):  
Hongki Lee ◽  
Joel Berk ◽  
Aaron Webster ◽  
Donghyun Kim ◽  
Matthew R Foreman
Keyword(s):  
Surface Plasmon ◽  
Experimental Measurements ◽  
Label Free ◽  
Sensor Surface ◽  
Supporting Surface ◽  
Bright Field ◽  
Label Free Detection ◽  
Speckle Patterns ◽  
Leakage Radiation ◽  
Plasmon Polaritons

Abstract We report sensing of single nanoparticles using disordered metallic nanoisland substrates supporting surface plasmon polaritons (SPPs). Speckle patterns arising from leakage radiation of elastically scattered SPPs provides a unique fingerprint of the scattering microstructure at the sensor surface. Experimental measurements of the speckle decorrelation are presented and shown to enable detection of sorption of individual gold nanoparticles and polystyrene beads. Our approach is verified through bright-field and fluorescence imaging of particles adhering to the nanoisland substrate.

scholarly journals Surface Enhanced Raman Scattering on Silver sinusoidal nano-grating: Impact of Interactions of grating-coupled Surface Plasmon polaritons

2021 ◽  
Author(s):  
Zhaoyi Chen ◽  
Ke Feng ◽  
Zhibin Chen ◽  
Jinxing Shen ◽  
Huanliang Li
Keyword(s):  
Refractive Index ◽  
Raman Scattering ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
The Impact ◽  
Plasmon Polaritons

Abstract In this study, we reported a silver sinusoidal nanograting used in microchannels, forming H2O/Ag/NOA heterostructure, and studied the impact of interactions of grating-coupled surface Plasmon polaritons (SPPs) on Surface-enhanced Raman Scattering (SERS). FDTD simulations showed that when the refractive index of NOA is close to that of H2O, there were two modes of odd coupling and even coupling between SPPs. Additionally, the thinner the Ag grating, the stronger the coupling, accompanied by the frequency shift of the two coupling modes. We also estimated the influence of refractive index of the surrounding medium on SPPs coupling by varying the dielectric of the upper and lower layer of Ag grating. Our experimental results were supported by FDTD calculations, which confirmed the importance of the interactions of grating-coupled SPPs in the design of SERS substrate.

Identification of Fluids by the Color of Surface Plasmon Polaritons

2014 ◽  
Vol 625 ◽  
pp. 316-321
Author(s):  
Miyu Ozaki ◽  
Tomohisa Sakai ◽  
Hiromichi Murata ◽  
Ryoshu Furutani
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
White Light ◽  
Low Cost ◽  
High Sensitivity ◽  
Light Illumination ◽  
Label Free ◽  
Free Electrons ◽  
Plasmon Polaritons

When optical waves make the free electrons on a metal surface resonate, optical energy propagates along the surface as density waves of the free electrons. The longitudinal waves and electrical fields of the electrons are called surface plasmon polaritons (SPPs), which are widely applied in high sensitivity sensors because the excitation of SPPs sensitively depends on the refractive index of the surrounding dielectric sample. Here, we report the identification of fluids by using the color dispersion of SPPs. Silver film on a prism surface is illuminated with white light to excite SPPs. A color component in the white light is thereby selectively coupled with SPPs due to the color dispersion that depends on the refractive index of the fluid on the film. Thus, theoretically, when the refractive index is changed, the color of SPPs changes as well. Our application uses a medium consisting of fluid samples to be identified. The proposed identification method can be applied to fluid analysis for label-free visualization of or as a simple analysis method, since the refractive indices or concentrations of the sample fluids directly affect the color of the SPPs, and this color can be visually identified. We theoretically confirmed that the color of SPPs excited with white light illumination can help to differentiate between water and ethanol. Experimentally, SPPs belonging to the frequency region of the color green were detected when the sample was water, and the color changed to red when ethanol was used instead. In the future, we plan to develop simple, small, sensitive, and low-cost sensors that can determine the concentration and refractive index of fluids on the basis of the color of the SPPs.

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