Surface-enhanced Raman scattering: effective optical constants for electric field modelling of nanostructured Ag films

2016 ◽  
Author(s):  
M. Nilusha M. N. Perera ◽  
Daniel Schmidt ◽  
W. E. Keith Gibbs ◽  
Saulius Juodkazis ◽  
Paul R. Stoddart
Keyword(s):  
Electric Field ◽  
Raman Scattering ◽  
Optical Constants ◽  
Surface Enhanced Raman Scattering ◽  
Field Modelling ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Local Electric Field Enhancement of Neighboring Ag Nanoparticles in Surface Enhanced Raman Scattering

2013 ◽  
Vol 760-762 ◽  
pp. 801-805 ◽  
Author(s):  
Chao Yue Deng ◽  
Gu Ling Zhang ◽  
Bin Zou ◽  
Hong Long Shi ◽  
Yu Jie Liang ◽  
...  
Keyword(s):  
Electric Field ◽  
Raman Scattering ◽  
Electric Fields ◽  
Ag Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Ag Nps ◽  
Sers Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We used a simple low-temperature hydrothermal approach to synthesize Ag nanoparticles (NPs) and demonstrated their efficiency as organic molecule detectors in surface enhanced Raman Scattering (SERS). Using finite difference time domain simulation, we described an investigation on the distribution of electric fields amplitude of the neighboring Ag NPs. The enhanced electric field is confined at the interparticle gaps and the enhancement factor can be further increased with reducing the spacing between the NPs. The theoretical simulation demonstrated good consistency with the experimental measurement results, which predicts an electric fields amplitude enhancement of 115 at the center of NPs gap and an electromagnetic SERS enhancement of 108. The evidence of clear correlations between SERS enhancement and morphology distribution offer a route to develop more effective SERS substrates.

Collapse-Induced Multimer Formation of Self-Assembled Nanoparticles for Surface Enhanced Raman Scattering

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 76
Author(s):  
Ju Young Kim ◽  
Young Taek Oh ◽  
Su Eon Lee ◽  
Jun Hyun Park ◽  
Shin Park ◽  
...  
Keyword(s):  
Electric Field ◽  
Raman Scattering ◽  
Field Intensity ◽  
Electric Field Intensity ◽  
Surface Enhanced Raman Scattering ◽  
Metallic Nanoparticle ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Self Assembled

Metallic nanoparticle ensemble, with narrow inter-particle distance, is a useful element for diverse optical devices due to highly enhanced electric field intensity at the gap. Self-assembly of block copolymer (BCP) can provide the versatile solution to fabricate precise nanostructures, but this methodology has the intrinsic limitation to realize optically coupled metallic multimer geometry with narrow inter-particle distance. This is because BCP-based nanotemplate possesses a minimum size limit for interparticle distance imposed by its thermodynamic restriction. Herein, we investigate the facile formation of metallic multimer with scalability and area-selectivity through the collapse of self-assembled BCP nanopattern. The capillary-force-induced collapse phenomenon enables a spatial transformation of lateral regular ordering in metallic nanoparticle array and enhances electric field intensity. The fabrication of this metallic nanoparticle ensemble from BCP lithography is successfully utilized for surface enhanced Raman scattering (SERS). The enhancement factor of metal nanoparticle multimer is calculated as ~6.74 × 105 at 1000 cm−1, 2.04 × 106 at 1022 cm−1, and 6.11 × 106 at 1580 cm−1, respectively.

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