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Photon Energy Dependent Micro-Raman Spectroscopy with a Continuum Laser Source.

Stefan Krause1, Marc H Overgaard2, Tom Vosch2

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We developed a continuous, photon energy-dependent micro Raman spectroscopy method. This technique analyzes reduced graphene oxide (rGO) across the visible spectrum, revealing insights into material properties.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Micro Raman spectroscopy is crucial for material characterization.
  • Photon energy dependence provides deeper insights into material properties.
  • Previous methods lacked continuous spectral coverage.

Purpose of the Study:

  • To develop a method for continuous, photon energy-dependent micro Raman spectroscopy.
  • To demonstrate the method's applicability on reduced graphene oxide (rGO).
  • To analyze the photon energy dependence of Raman bands.

Main Methods:

  • Utilized a continuum laser with an acousto-optic tunable filter (AOTF) and monochromator (MC).
  • Automated laser, AOTF, MC, and tunable long-pass filters for wavelength scanning.
  • Acquired Raman spectra synchronously over a broad photon energy range (1.41–2.83 eV).

Main Results:

  • Successfully demonstrated continuous micro Raman spectroscopy across the visible spectrum.
  • Analyzed photon energy dependence of D, G, and GS bands in rGO.
  • Observed a minor deviation from linearity in the D band dispersion.

Conclusions:

  • The developed method enables comprehensive, continuous photon energy-dependent micro Raman spectroscopy.
  • The study validates the method using rGO, providing detailed band dispersion data.
  • Further analysis of band dispersion can reveal subtle material characteristics.