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Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
Published on: April 28, 2022
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Coherent anti-Stokes Raman spectroscopy of single and multi-layer graphene
A Virga1,2, C Ferrante3,4, G Batignani1
1Dipartimento di Fisica, Universitá di Roma, "La Sapienza", I-00185, Roma, Italy.
Nature Communications
|August 16, 2019
Summary
We developed a new method for stimulated Raman spectroscopy in graphene, overcoming challenges in coherent nonlinear optical measurements. This technique enables sensitive imaging of graphene
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Spontaneous Raman spectroscopy is crucial for graphene characterization.
- Extending Raman spectroscopy to the coherent regime in graphene is challenging due to its complex optical response.
- Interfering electronic and phononic transitions obscure spectral profiles in graphene's nonlinear optical response.
Purpose of the Study:
- To report stimulated Raman spectroscopy of the G-phonon in single and multi-layer graphene.
- To overcome challenges in coherent nonlinear optical measurements of graphene.
- To demonstrate graphene imaging with vibrational sensitivity using coherent anti-Stokes Raman Scattering.
Main Methods:
- Utilized coherent anti-Stokes Raman Scattering (CARS) for stimulated Raman spectroscopy.
- Investigated single and multi-layer graphene samples.
- Reduced temporal overlap of laser excitation pulses to suppress non-resonant background.
Main Results:
- Successfully measured the vibrationally resonant CARS peak of the G-phonon in graphene.
- Demonstrated suppression of the vibrationally non-resonant background by controlling laser pulse overlap.
- Developed a model accounting for the electronically resonant nature of graphene's optical response.
Conclusions:
- Coherent anti-Stokes Raman Scattering can be effectively used for graphene characterization.
- The developed method allows for sensitive imaging of graphene with vibrational sensitivity.
- This advancement opens new avenues for probing graphene's properties using nonlinear spectroscopy.
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