scholarly journals Optimization of parameters of binary phase axicons for the generation of terahertz vortex surface plasmon polaritons on cylindrical conductors

2020 ◽  
Vol 44 (5) ◽  
pp. 852-856
Author(s):  
B.A. Knyazev ◽  
V.S. Pavelyev
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Twist Angle ◽  
Front Face ◽  
Long Wavelength ◽  
The Relationship ◽  
Plasmon Polaritons ◽  
Cylindrical Conductors ◽  
Illuminating Beam ◽  
Spiral Phase

The feasibility of generating surface plasmon polaritons carrying orbital angular momentum ("vortex plasmons") on cylindrical conductors by an end-fire coupling technique in the spectral range from 8.5 to 141 μm (~ 2-40 THz) is considered. The front face of the cylinder is illuminated by Bessel beams formed using binary spiral phase axicons, or annual vortex beams formed in the focal plane of an additional lens. Graphs are constructed that reveal the relationship between the waveguide parameters (conductor diameter, which is equal to the diameter of the illuminating beam, and the “twist” angle of the plasmon) and the axicon parameters (the ratio of the axicon period to the radiation wavelength) for the above wavelengths and topological charges of the beams ranging from 1 to 9. The results obtained indicate the possibility of conducting experiments in the long-wavelength range for modeling a plasmon multiplex communication channel.

scholarly journals Enhancement of the Surface Plasmon Polaritons Excitation Efficiency

2019 ◽  
Vol 54 (5) ◽  
Author(s):  
Riyadh D. Mansoor ◽  
Alistair Duffy
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Incident Angle ◽  
Thin Metal Film ◽  
Excitation Efficiency ◽  
Sensing Applications ◽  
Metal Thickness ◽  
Collective Oscillations ◽  
The Relationship ◽  
Plasmon Polaritons

Surface Plasmon Polaritons (SPPs) are propagating excitations that arise from the coupling of light with collective oscillations of electrons on the metal surface. This paper describes a new approach for increasing the SPP excitation efficiency. Using a computational electromagnetics approach, potential techniques for reducing incident power reflectivity were investigated using the Kretschmann configuration. The effects of different parameters such as incident angle, metal thickness, and dielectric permittivity were tested and optimized to improve the efficiency of SPPs by minimizing reflectivity. An 30% increase in efficiency was obtained. In addition, the optical response of a thin metal film on a glass substrate was numerically examined in terms of SPP excitation. The dependency of the response on the incident angle, materials, and dimensions were demonstrated. This paper describes how an improvement in efficiency can improve the effectiveness of bio-sensing applications through the proper choice of layer dimensions and material permittivity of different layers. The relationship between incident angle and reflectivity for different permittivities can be used for bio-sensing applications such as blood glucose biosensors, etc.

scholarly journals Terahertz Sensor Study Based on Spoof Surface Plasmon Polaritons

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Ruiqi Zhao ◽  
Guizhen Lu ◽  
Hongcheng Yin ◽  
Jingjing Liang ◽  
Dongdong Zeng ◽  
...  
Keyword(s):  
Refractive Index ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Matching Condition ◽  
Gap Size ◽  
Resonance Position ◽  
Reflection Amplitude ◽  
The Relationship ◽  
Plasmon Polaritons ◽  
Spoof Surface Plasmon Polaritons

The spoof surface plasmon polaritons (SSPPs) structure can be used as a sensor in THz region for the biosensing. The accuracy of resonance and amplitude for sensor is very important for biosensing. The momentum matching of SSPPs determines the resonance position and the gap distance determines the amplitude. For the biomolecular sensing, the sample is positioned between the prism base and the SSPPs structure. The momentum matching condition at the current study does not consider the effect of sample refractive index and the resonance position has a significant error. Here the correction is made to the momentum matching condition which considers the effect of the sample refractive index. A comparative study of surface plasmon resonance (SPR) sensing performance based on frequency and angle variations shows that the sensing sensitivity for frequency region is superior to that of angle region; in the meanwhile, as an application of biosensors, we have detected different types of brain lesions in the frequency range. Furthermore, the reflection amplitude is related to gap size between the prism and SSPPs. The relationship of gap size and reflection amplitude is studied. By using the relationship between gap size and reflection amplitude, the amplitudes at different frequencies or incident angles for different refractivities have the same reflection dips compared to the other published results. The simulation is performed and the results proved the theory.

Conversion of surface plasmon polaritons into photons: visual observation

2011 ◽  
Vol 181 (3) ◽  
pp. 305 ◽  
Author(s):  
V.B. Zon ◽  
B.A. Zon ◽  
V.G. Klyuev ◽  
A.N. Latyshev ◽  
D.A. Minakov ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Visual Observation ◽  
Plasmon Polaritons

A compact design for narrowband optical absorber based on surface plasmon polaritons

2020 ◽  
Vol 14 (1) ◽  
pp. 015002
Author(s):  
Xinguang Hu ◽  
Cheng Zeng ◽  
Jinsong Xia ◽  
Yunji Meng
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Compact Design ◽  
Plasmon Polaritons
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