The effect of substrate on electric field enhancement of Tip-enhanced Raman spectroscopy (TERS)

2018 ◽  
Author(s):  
Maryam Bahreini
Keyword(s):  
Raman Spectroscopy ◽  
Electric Field ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Tip Enhanced Raman Spectroscopy

scholarly journals Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bao-xin Yan ◽  
Yan-ying Zhu ◽  
Yong Wei ◽  
Huan Pei
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Raman Scattering ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

AbstractIn this paper, the surface enhanced Raman scattering (SERS) characteristics of Au and Au@Al2O3 nanoparticle dimers were calculated and analyzed by using finite element method (3D-FEM). Firstly, the electric field enhancement factors of Au nanoparticles at the dimer gap were optimized from three aspects: the incident angle of the incident light, the radius of nanoparticle and the distance of the dimer. Then, aluminum oxide is wrapped on the Au dimer. What is different from the previous simulation is that Al2O3 shell and Au core are regarded as a whole and the total radius of Au@Al2O3 dimer is controlled to remain unchanged. By comparing the distance of Au nucleus between Au and Au@Al2O3 dimer, it is found that the electric field enhancement factor of Au@Al2O3 dimer is much greater than that of Au dimer with the increase of Al2O3 thickness. The peak of electric field of Au@Al2O3 dimer moves towards the middle of the resonance peak of the two materials, and it is more concentrated than that of the Au dimer. The maximum electric field enhancement factor 583 is reached at the shell thickness of 1 nm. Our results provide a theoretical reference for the design of SERS substrate and the extension of the research scope.

scholarly journals Broad range electric field enhancement of a plasmonic nanosphere heterodimer

2020 ◽  
Vol 10 (7) ◽  
pp. 1704
Author(s):  
Desalegn T. Debu ◽  
Qigeng Yan ◽  
Ahmad Aziz Darweesh ◽  
Mourad Benamara ◽  
Gregory Salamo
Keyword(s):  
Electric Field ◽  
Field Enhancement ◽  
Electric Field Enhancement

scholarly journals Spatial distribution of electric-field enhancement across the gap of terahertz bow-tie antennas

2020 ◽  
Vol 28 (17) ◽  
pp. 24389 ◽  
Author(s):  
Matthias Runge ◽  
Dieter Engel ◽  
Michael Schneider ◽  
Klaus Reimann ◽  
Michael Woerner ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Electric Field ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Bow Tie ◽  
Distribution Of Electric Field

scholarly journals Distribution of earth atmospheric electric field in the vicinity of the vehicles for transport petroleum derivates

2006 ◽  
Vol 19 (2) ◽  
pp. 189-196 ◽  
Author(s):  
Alenka Milovanovic
Keyword(s):  
Electric Field ◽  
Human Body ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Field Enhancement Factor ◽  
Atmospheric Electric Field ◽  
Electric Field Enhancement ◽  
Petrol Station ◽  
Electrode Method ◽  
Petrol Pump

In this paper using Equivalent Electrode Method (EEM) Atmospheric Electric Field (AEF) distribution in the vicinity of the cargo vehicle is approximately numerically determined, when the vehicles are situated on petrol station near by petrol pump and people. The petrol pump is always grounded, but human body and vehicle are treated as grounded or 'floating' electrodes. Several results of electric field enhancement factor for the vehicle including maps of equienergetic curves are presented.

scholarly journals Extreme terahertz electric-field enhancement in high-Q photonic crystal slab cavity with nanoholes

2018 ◽  
Vol 26 (23) ◽  
pp. 30851 ◽  
Author(s):  
Qijing Lu ◽  
Xiaogang Chen ◽  
Chang-Ling Zou ◽  
Shusen Xie
Keyword(s):  
Photonic Crystal ◽  
Electric Field ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
High Q ◽  
Photonic Crystal Slab

Study on non-local effects in dimers of circular and elliptical cross-sections

2021 ◽  
Author(s):  
Xi Zhang ◽  
Wenyuan Wu ◽  
Yanchun Gong ◽  
Suhong He ◽  
Fangping Wu ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Electric Field ◽  
Cross Section ◽  
Cross Sections ◽  
Field Enhancement ◽  
Radius Of Curvature ◽  
Electric Field Enhancement ◽  
Nonlocal Effects ◽  
Elliptical Cross ◽  
Non Local

Abstract The nonlocal effects of dimers consisted of two cylinders are studied, whose cross section is elliptical. Importantly, the results with dimers whose cross section is circular are compared. For comparison, the curvature of the ellipse is set the same with the circle, and four different geometries are considered. The electric field enhancement at the gap center and the absorption spectrum of the dimers are calculated. For the second geometry, either the electric field enhancement at the gap center or the absorption spectrum is approximately calculated using the first geometry, the frequencies corresponding to the peaks are totally different. Similarly, for the fourth geometry, either the electric field enhancement at the gap center or the absorption spectrum is approximately calculated using the third geometry, the disciplines of the peak values change as radius of curvature increases are totally different.

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