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Title: Raman signal enhancement by multiple beam excitation and its application for the detection of chemicals

Abstract

In a typical Raman based sensor, a single laser beam is used for exciting the sample and the backscattered or forward scattered light is collected using collection optics and is analyzed by a spectrometer. We have investigated that by means of exciting the sample with multiple beams, i.e., by dividing the same input power of the single beam into two or three or more beams and exciting the sample from different angles, the Raman signal enhances significantly. Due to the presence of multiple beams passing through the same volume of the sample, an interference pattern is formed and the volume of interaction of excitation beams with the sample increases. By means of this geometry, the enhancement in the Raman signal is observed and it was found that the signal strength increases linearly with the increase in number of excitation beams. Experimental results of this scheme for excitation of the samples are reported for explosive detection at a standoff distance.

Authors:
 [1]; ; ;  [1]
  1. Laser Science and Technology Centre, Metcalfe House, Delhi 110054 (India)
Publication Date:
OSTI Identifier:
22489190
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAMS; DETECTION; DISTANCE; EXCITATION; EXPLOSIVES; GEOMETRY; SENSORS; SIGNALS; SPECTROMETERS; VISIBLE RADIATION

Citation Formats

Gupta, Sakshi, Instrument Design and Development Centre, Indian Institute of Technology, Hauz Khas, New Delhi 110016, Ahmad, Azeem, Mehta, Dalip S., E-mail: mehtads@physics.iitd.ac.in, Gambhir, Vijayeta, and Reddy, Martha N. Raman signal enhancement by multiple beam excitation and its application for the detection of chemicals. United States: N. p., 2015. Web. doi:10.1063/1.4929951.
Gupta, Sakshi, Instrument Design and Development Centre, Indian Institute of Technology, Hauz Khas, New Delhi 110016, Ahmad, Azeem, Mehta, Dalip S., E-mail: mehtads@physics.iitd.ac.in, Gambhir, Vijayeta, & Reddy, Martha N. Raman signal enhancement by multiple beam excitation and its application for the detection of chemicals. United States. https://doi.org/10.1063/1.4929951
Gupta, Sakshi, Instrument Design and Development Centre, Indian Institute of Technology, Hauz Khas, New Delhi 110016, Ahmad, Azeem, Mehta, Dalip S., E-mail: mehtads@physics.iitd.ac.in, Gambhir, Vijayeta, and Reddy, Martha N. 2015. "Raman signal enhancement by multiple beam excitation and its application for the detection of chemicals". United States. https://doi.org/10.1063/1.4929951.
@article{osti_22489190,
title = {Raman signal enhancement by multiple beam excitation and its application for the detection of chemicals},
author = {Gupta, Sakshi and Instrument Design and Development Centre, Indian Institute of Technology, Hauz Khas, New Delhi 110016 and Ahmad, Azeem and Mehta, Dalip S., E-mail: mehtads@physics.iitd.ac.in and Gambhir, Vijayeta and Reddy, Martha N.},
abstractNote = {In a typical Raman based sensor, a single laser beam is used for exciting the sample and the backscattered or forward scattered light is collected using collection optics and is analyzed by a spectrometer. We have investigated that by means of exciting the sample with multiple beams, i.e., by dividing the same input power of the single beam into two or three or more beams and exciting the sample from different angles, the Raman signal enhances significantly. Due to the presence of multiple beams passing through the same volume of the sample, an interference pattern is formed and the volume of interaction of excitation beams with the sample increases. By means of this geometry, the enhancement in the Raman signal is observed and it was found that the signal strength increases linearly with the increase in number of excitation beams. Experimental results of this scheme for excitation of the samples are reported for explosive detection at a standoff distance.},
doi = {10.1063/1.4929951},
url = {https://www.osti.gov/biblio/22489190}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 9,
volume = 107,
place = {United States},
year = {Mon Aug 31 00:00:00 EDT 2015},
month = {Mon Aug 31 00:00:00 EDT 2015}
}