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Title: Broadband surface-enhanced coherent anti-Stokes Raman spectroscopy with high spectral resolution

Journal Article · · Journal of Raman Spectroscopy
DOI:https://doi.org/10.1002/jrs.5165· OSTI ID:1483528
ORCiD logo [1];  [2]; ORCiD logo [2];  [3];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Both the surface-enhanced Raman spectroscopy (SERS) and coherent anti-Stokes Raman spectroscopy (CARS) are widely used methods in the bio-sensing field for improving the intensity of Raman scattering process. By combining the mechanisms of CARS (coherence and nonlinear process) and SERS (plasmon resonance), a multiplicative enhancement can be achieved through surface-enhanced CARS (SECARS). Besides sensitivity, high specificity with wide spectral bandwidth is also preferred for bio-sensing techniques but not well developed in SECARS setups reported in the literature. A broadband SECARS setup with high sensitivity and high spectral resolution is presented. Rhodamine 6G dye molecules and several biomolecules are used as the model system to benchmark the functionality of the SECARS system in terms of its sensitivity, the lowest detectable concentration, and the spectral resolution. Our setup rendered single-molecule sensitivity with spectral resolution of <35 cm-1. More than 102 times stronger signal-to-noise ratio compared with that of SERS is observed with the detection limit being 10-9 m. Different from the SECARS systems in the literature, our setup employs a unique graphene-Au pyramids hybrid platform. The graphene in this structure provides additional SERS enhancement and a bio-compatible surface. Finally, this powerful technique could be instrumental in furthering the understanding of various chemical and biological processes.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1483528
Report Number(s):
LA-UR-18-23396
Journal Information:
Journal of Raman Spectroscopy, Vol. 48, Issue 7; ISSN 0377-0486
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (5)

Laser intensity limits in surface‐enhanced linear and nonlinear Raman micro‐spectroscopy of organic molecule/Au‐nanoparticle conjugates journal October 2018
Selective excitation of one among the three peaks of tip‐enhanced Raman spectroscopy by a shaped ultrafast laser pulse journal November 2019
A Review on Applications of Two-Dimensional Materials in Surface-Enhanced Raman Spectroscopy journal January 2018
Coherent Raman scattering with plasmonic antennas journal May 2019
2D Materials-Coated Plasmonic Structures for SERS Applications journal April 2018