Enhanced dielectric waveguide mode from the coupling of surface plasmon polaritons excited by a parallel electron beam

2019 ◽  
Vol 433 ◽  
pp. 195-199 ◽  
Author(s):  
Lingxi Hu ◽  
Sen Gong ◽  
Min Hu ◽  
Renbin Zhong ◽  
Tao Zhao ◽  
...  
Keyword(s):  
Electron Beam ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Dielectric Waveguide ◽  
Waveguide Mode ◽  
Plasmon Polaritons

scholarly journals Coherent and tunable terahertz radiation from graphene surface plasmon polaritons excited by an electron beam

2014 ◽  
Vol 104 (20) ◽  
pp. 201104 ◽  
Author(s):  
Shenggang Liu ◽  
Chao Zhang ◽  
Min Hu ◽  
Xiaoxing Chen ◽  
Ping Zhang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Terahertz Radiation ◽  
Graphene Surface ◽  
Plasmon Polaritons

scholarly journals High Sensitive Biosensors Based on the Coupling Between Surface Plasmon Polaritons on Titanium Nitride and a Planar Waveguide Mode

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1784 ◽  
Author(s):  
Junior Asencios ◽  
Ramiro Moro ◽  
Clemente Luyo ◽  
Arturo Talledo
Keyword(s):  
Refractive Index ◽  
Absorption Band ◽  
Titanium Nitride ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Planar Waveguide ◽  
Waveguide Mode ◽  
Fano Resonances ◽  
Broad Absorption Band ◽  
Plasmon Polaritons

High sensitivity biosensors based on the coupling of surface plasmon polaritons on titanium nitride (TiN) and a planar waveguide mode were built; they were proved by sensing three different media: air, water and dried egg white; sensors described here could be useful for sensing materials with a refractive index between 1.0 and 1.6; in particular, materials of biological interest with a refractive index in the range 1.3–1.6, like those containing biotin and/or streptavidin. They were built by depositing Nb2O5/SiO2/TiN multilayer structures on the flat surface of D-shaped sapphire prisms by using the dc magnetron sputtering technique. Attenuated total reflection (ATR) experiments in the Kretschmann configuration were accomplished for the air/TiN/Prism and S/Nb2O5/SiO2/TiN/Prism structures, S being the sample or sensing medium. ATR spectra for plasmons at the TiN/air interface showed a broad absorption band for angles of incidence between 36 and 85°, with full width at half maximum (FWHM) of approximately 40°. For the S/Nb2O5/SiO2/TiN/Prism structures, ATR spectra showed a sharp reflectivity peak, within the broad plasmonic absorption band, which was associated with Fano resonances. The angular position and FWHM of the Fano resonances strongly depend on the refractive index of the sensing medium. ATR spectra were fitted by using the transfer-matrix method. Additionally, we found that angular sensitivity and figure of merit increase with increasing the refractive index of the sensing medium.

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