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Plexciton for surface enhanced Raman scattering and emission
Author(s) -
Feng Yanting,
Gao Man,
Wang Yu,
Meng Lingyan,
Sun Mengtao
Publication year - 2020
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5806
Subject(s) - raman scattering , materials science , substrate (aquarium) , raman spectroscopy , plasmon , semiconductor , surface plasmon , scattering , excitation , optoelectronics , exciton , optics , condensed matter physics , physics , oceanography , quantum mechanics , geology
Plexcitons are polaritonic modes that result from coherently coupled plasmons and excitons. Far‐ and near‐field properties of Ag/semiconductor core–shell nanoparticles on silica‐coated silver substrate were theoretically studied, using finite‐difference time‐domain method. Our calculations suggested that titanium dioxide (TiO 2 ) would be a better coating material, useful for the design of high‐sensitive surface enhanced Raman scattering (SERS) substrate. The calculated Raman enhancement factor could be turned to as high as 4.0 × 10 10 under the 633‐nm laser excitation. Surface plasmon‐coupled emission of SERS reveals an optimal collection angle of 5°, which shows a huge back scattering of the studied system. Our theoretical results could be used as a reference for the experimental design of semiconductor‐based SERS substrate with high efficiency.