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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 750-754 |
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Noori A, Bahreini M, Aref S H. Localized enhancement of electric field in tip-enhanced-Raman spectroscopy using linearly polarized light. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :750-754
URL: http://opsi.ir/article-1-2471-en.html
URL: http://opsi.ir/article-1-2471-en.html
1- Qom University, Qom
2- Iran University of Science and Technology, Tehran
2- Iran University of Science and Technology, Tehran
Abstract: (819 Views)
Finite-Difference Time-Domain (FDTD) calculations are used estimate the electric field in the vicinity of a sharp silver cone with an apex diameter of 10 nm. The simulations are utilized to predict the intensity and the distribution of the locally enhanced electric field in Tip-Enhanced Raman Spectroscopy (TERS). A side-by-side comparison of the enhanced electric field induced by a linearly polarized light in both gap-mode and conventional TERS setup is performed. For this purpose, a linearly polarized source is introduced and integrated into the FDTD modelling. Additionally, the optical effect of a thin protective layer of alumina on the enhancement of the electric field is investigated. Results show that by utilizing a thin film of as a substrate for TERS measurements, a considerable increase in the sensitivity can be achieved. Additionally, results show that adding a thin protective layer to the TERS tip decreases the intensity of the electric field.
Keywords: Electric Field Enhancement, Tip-Enhanced Raman Spectroscopy, Finite-Difference Time-Domain
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