Investigation of the Importance of the Electronic Enhancement Mechanism for Surface-Enhanced Raman Scattering (SERS)

2021 ◽  
Author(s):  
Faezeh Mohaghegh ◽  
Alireza Mazaheri Tehrani ◽  
Arnulf Materny
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Enhancement Mechanism ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering on organic–inorganic hybrid perovskites

2018 ◽  
Vol 54 (17) ◽  
pp. 2134-2137 ◽  
Author(s):  
Xiaoyue Su ◽  
Hao Ma ◽  
He Wang ◽  
Xueliang Li ◽  
Xiao Xia Han ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Inorganic Hybrid ◽  
Enhancement Mechanism ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
First Time

For the first time SERS on organic–inorganic hybrid perovskites is explored. The enhancement mechanism is discussed according to charge transfer.

scholarly journals Experimental Evidence of Two-fold Electromagnetic Enhancement Mechanism of Surface-Enhanced Raman Scattering

2020 ◽  
Author(s):  
Samir Kumar ◽  
Kouta Tokunaga ◽  
Kyoko Namura ◽  
Takao Fukuoka ◽  
Motofumi Suzuki
Keyword(s):  
Raman Scattering ◽  
Scattered Light ◽  
Surface Enhanced Raman Scattering ◽  
Nanorod Array ◽  
Enhancement Mechanism ◽  
Light Interference ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Local Plasmon

The surface-enhanced Raman scattering (SERS) electromagnetic (EM) enhancement mechanism is a two-fold enhancement process in which both the incident and scattered Raman fields are enhanced. In this letter, we present new direct evidence of the two-fold EM mechanism by using an Ag nanorod array/SiO<sub>2</sub> dielectric layer/Ag mirror multilayer thin film "local plasmon resonator". The two-fold EM enhancement mechanism of SERS was confirmed by analyzing the optical absorption and Raman scattering spectra of the local plasmon resonator for excitation and scattered light. The effect of light interference was altered by varying the film thickness of the SiO<sub>2</sub> phase control layer (PCL), and the absorbance in the Raman scattering wavelength range was reduced from 90% to 0%. We also demonstrated that the intensity of the background emission is closely related to the enhancement of the scattered field and provides substantial evidence for a two-fold SERS enhancement mechanism.

scholarly journals Surface-Enhanced Raman Scattering and Fluorescence on Gold Nanogratings

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 776 ◽  
Author(s):  
Yu-Chung Chang ◽  
Bo-Han Huang ◽  
Tsung-Hsien Lin
Keyword(s):  
Thin Film ◽  
Raman Scattering ◽  
Fluorescence Enhancement ◽  
Surface Enhanced Raman Scattering ◽  
Simple Method ◽  
Enhancement Mechanism ◽  
Gold Thin Film ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) spectroscopy is a sensitive sensing technique. It is desirable to have an easy method to produce SERS-active substrate with reproducible and robust signals. We propose a simple method to fabricate SERS-active substrates with high structural homogeneity and signal reproducibility using electron beam (E-beam) lithography without the problematic photoresist (PR) lift-off process. The substrate was fabricated by using E-beam to define nanograting patterns on the photoresist and subsequently coat a layer of gold thin film on top of it. Efficient and stable SERS signals were observed on the substrates. In order to investigate the enhancement mechanism, we compared the signals from this substrate with those with photoresist lifted-off, which are essentially discontinuous gold stripes. While both structures showed significant grating-period-dependent fluorescence enhancement, no SERS signal was observed on the photoresist lifted-off gratings. Only transverse magnetic (TM)-polarized excitation exhibited strong enhancement, which revealed its plasmonic attribution. The fluorescence enhancement showed distinct periodic dependence for the two structures, which is due to the different enhancement mechanism. We demonstrate using this substrate for specific protein binding detection. Similar periodicity dependence was observed. Detailed theoretical and experimental studies were performed to investigate the observed phenomena. We conclude that the excitation of surface plasmon polaritons on the continuous gold thin film is essential for the stable and efficient SERS effects.

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