scholarly journals Electric-Field Enhancement in Mid-Infrared Range by Metal Nanostructures

2015 ◽  
Vol 43 (5) ◽  
pp. 309
Author(s):  
Satoshi ASHIHARA ◽  
Fumiya KUSA
Keyword(s):  
Electric Field ◽  
Field Enhancement ◽  
Metal Nanostructures ◽  
Infrared Range ◽  
Electric Field Enhancement ◽  
Mid Infrared

An aligned octahedral core in a nanocage: synthesis, plasmonic, and catalytic properties

Nanoscale ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 3138-3144 ◽  
Author(s):  
Evgeniia Khairullina ◽  
Kseniia Mosina ◽  
Rachelle M. Choueiri ◽  
Andre Philippe Paradis ◽  
Ariel Alcides Petruk ◽  
...  
Keyword(s):  
Electric Field ◽  
Catalytic Properties ◽  
Field Enhancement ◽  
Local Electric Field ◽  
Metal Nanostructures ◽  
Electric Field Enhancement ◽  
Optical Responses ◽  
Local Electric Field Enhancement

Plasmonic metal nanostructures with complex morphologies provide an important route to tunable optical responses and local electric field enhancement at the nanoscale for a variety of applications including sensing, imaging, and catalysis.

Gold nanonails for surface-enhanced infrared absorption

2020 ◽  
Vol 5 (8) ◽  
pp. 1200-1212
Author(s):  
Hang Yin ◽  
Nannan Li ◽  
Yubing Si ◽  
Han Zhang ◽  
Baocheng Yang ◽  
...  
Keyword(s):  
Electric Field ◽  
Infrared Absorption ◽  
Colloidal Gold ◽  
Field Enhancement ◽  
Infrared Region ◽  
Electric Field Enhancement ◽  
Mid Infrared ◽  
Large Electric Field ◽  
Surface Enhanced

Colloidal gold nanonails, exhibiting large electric field enhancement in the mid-infrared region, are synthesized for surface-enhanced infrared absorption (SEIRA).

Realistic FDTD Simulations of Plasmonic Properties on Ag Columnar Thin Films as SERS Biosensor

NANO ◽  
2016 ◽  
Vol 11 (10) ◽  
pp. 1650113
Author(s):  
Yan-Juan Liao ◽  
Jing-Nan Huang ◽  
Jia-Yang Guo ◽  
Shao-Ji Jiang
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Hot Spots ◽  
Near Infrared ◽  
Structural Characteristics ◽  
Field Enhancement ◽  
Infrared Range ◽  
Electric Field Enhancement ◽  
Sem Images ◽  
Sculptured Thin Films

Noble metal sculptured thin films are of great interest during last decade as excellent surface-enhanced Raman scattering (SERS) substrates due to remarkable plasmonic properties in the visible and near-infrared range. In this work, Ag columnar thin films (Ag-CTFs) have been prepared by the glancing angle deposition technique. Finite-difference time-domain simulations has been utilized to study plasmonic properties of Ag-CTFs with a more accurate model based on binary scanning electron microscope (SEM) images by taking account of the shape irregularities, size distributions and random arrangement. The calculated absorption spectra based on the model of binarized SEM images show the best agreement with the measured spectra compared with models of periodic array with a regular shape. The near-field plasmonic properties are simulated based on the verified model. The distributions of electric field enhancement and hot spots are confirmed to be spectral and polarization dependent. There are multiple resonance peaks from visible to near-infrared and multiple eigenmodes coexist at the same wavelength and electric field enhancement are mainly excited by the polarized light vertical to the gap orientation. The electric field enhancement is found to distribute unevenly in the films with surface-localized feature. The equations to calculate the simulation SERS enhancement factor (EF) and total number of hot spots (tHN) are modified according to the above discussions. The experimental SERS EFs are on the order of 107–108, which indicates the high sensitivity of the films and the simulation SERS EFs and tHNs show good agreement with the experimental EFs. It is found that the SERS performance of Ag-CTFs is decided by both the cross-section structural characteristics and film thickness, which affect the electric filed enhancement and number of adsorbed molecules, respectively. Our work could be helpful in understanding the SERS mechanism and useful to the optimization of metal sculptured thin films for designing SERS biosensor.

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
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