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Title: Asymmetry of Raman scattering by structure variation in space

In this, we report on the discovery of asymmetries of Raman scattering along one scanning direction, between two scanning directions, and by structure variation of the sample in space. Asymmetry of Raman shift along the x direction, and the asymmetry of Raman shift and linewidth between the two scanning directions (x and y) are found for a 1210 nm diameter silica particle. The observed asymmetries are confirmed by further 2D Raman scanning of the same particle. To further explore the asymmetry of Raman scattering, glass fibers of three diameters (0.53, 1.00, and 3.20 μm) are scanned along two directions. The asymmetry of Raman shift along each direction, the asymmetry of linewidth along the y direction, and the asymmetry of Raman shift and linewidth between the two scanning directions are discovered. Additionally, 11 nm-thick MoSe 2 nanosheets on silicon are used to discover whether an asymmetry of Raman scattering exists at the edge of the nanosheets. One edge of the nanosheet is scanned in four directions and the asymmetry of Raman scattering caused by the step variation is also detected. All the observed Raman scattering asymmetries are explained soundly by the Raman signal diffraction and image shift on the CCD detectormore » arrays of the Raman spectrometer. In practice, to use scanning Raman for surface structure study, great measure has to be taken to consider the structure-induced asymmetries to uncover the real Raman wave number variation by intrinsic material structure. We propose a signal processing method by averaging the scanning points along four directions to eliminate the interference of the edge. This method works well to significantly suppress the asymmetries of Raman properties and uncover the real Raman signal change by structure variation.« less
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Iowa State Univ., Ames, IA (United States). Dept. of Mechanical Engineering
Publication Date:
Grant/Contract Number:
EE0007686; NE0000671; CBET1235852; CMMI1264399; MG-16-025; OG-17-005
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 25; Journal Issue: 15; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Iowa State Univ., Ames, IA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF); Iowa Energy Center, Ames, IA (United States)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 42 ENGINEERING
OSTI Identifier:
1467022

Wang, Ridong, Yuan, Pengyu, Han, Meng, Xu, Shen, Wang, Tianyu, and Wang, Xinwei. Asymmetry of Raman scattering by structure variation in space. United States: N. p., Web. doi:10.1364/OE.25.018378.
Wang, Ridong, Yuan, Pengyu, Han, Meng, Xu, Shen, Wang, Tianyu, & Wang, Xinwei. Asymmetry of Raman scattering by structure variation in space. United States. doi:10.1364/OE.25.018378.
Wang, Ridong, Yuan, Pengyu, Han, Meng, Xu, Shen, Wang, Tianyu, and Wang, Xinwei. 2017. "Asymmetry of Raman scattering by structure variation in space". United States. doi:10.1364/OE.25.018378. https://www.osti.gov/servlets/purl/1467022.
@article{osti_1467022,
title = {Asymmetry of Raman scattering by structure variation in space},
author = {Wang, Ridong and Yuan, Pengyu and Han, Meng and Xu, Shen and Wang, Tianyu and Wang, Xinwei},
abstractNote = {In this, we report on the discovery of asymmetries of Raman scattering along one scanning direction, between two scanning directions, and by structure variation of the sample in space. Asymmetry of Raman shift along the x direction, and the asymmetry of Raman shift and linewidth between the two scanning directions (x and y) are found for a 1210 nm diameter silica particle. The observed asymmetries are confirmed by further 2D Raman scanning of the same particle. To further explore the asymmetry of Raman scattering, glass fibers of three diameters (0.53, 1.00, and 3.20 μm) are scanned along two directions. The asymmetry of Raman shift along each direction, the asymmetry of linewidth along the y direction, and the asymmetry of Raman shift and linewidth between the two scanning directions are discovered. Additionally, 11 nm-thick MoSe2 nanosheets on silicon are used to discover whether an asymmetry of Raman scattering exists at the edge of the nanosheets. One edge of the nanosheet is scanned in four directions and the asymmetry of Raman scattering caused by the step variation is also detected. All the observed Raman scattering asymmetries are explained soundly by the Raman signal diffraction and image shift on the CCD detector arrays of the Raman spectrometer. In practice, to use scanning Raman for surface structure study, great measure has to be taken to consider the structure-induced asymmetries to uncover the real Raman wave number variation by intrinsic material structure. We propose a signal processing method by averaging the scanning points along four directions to eliminate the interference of the edge. This method works well to significantly suppress the asymmetries of Raman properties and uncover the real Raman signal change by structure variation.},
doi = {10.1364/OE.25.018378},
journal = {Optics Express},
number = 15,
volume = 25,
place = {United States},
year = {2017},
month = {7}
}