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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Enhanced-Resolution Single-Shot 2DFT Spectroscopy by Spatial Spectral Interferometry.

Austin P Spencer1, Boris Spokoyny1, Elad Harel1

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.

The Journal of Physical Chemistry Letters
|August 12, 2015
PubMed
Summary
This summary is machine-generated.

We present spatial spectral interferometry (SSI) for full electric field reconstruction of 2D coherent spectroscopic signals. This method overcomes limitations of Fourier transform spectral interferometry (FTSI), enhancing sensitivity and resolution in four-wave mixing (4WM) measurements.

Keywords:
Fourier transform spectral interferometrySEA TADPOLEfour-wave mixinglight-harvesting proteinrubidium vaportwo-dimensional Fourier transform spectroscopy

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Area of Science:

  • Spectroscopy
  • Quantum Optics
  • Chemical Physics

Background:

  • Four-wave mixing (4WM) generates coherent spectroscopic signals.
  • Fourier transform spectral interferometry (FTSI) is the conventional method for 4WM signal characterization.
  • FTSI has limitations in sensitivity and resolution for amplitude and phase reconstruction.

Purpose of the Study:

  • To demonstrate spatial interference for complete electric field reconstruction of 2D coherent spectroscopic signals.
  • To introduce spatial spectral interferometry (SSI) as a generalized and improved method for 4WM signal detection.
  • To overcome the inherent limitations of FTSI without adding experimental complexity.

Main Methods:

  • Utilizing spatial interference for electric field reconstruction in a single laser shot.
  • Implementing spatial spectral interferometry (SSI) for 4WM signal detection.
  • Measuring 2D photon echo spectra of rubidium vapor and light-harvesting protein LH2.

Main Results:

  • Complete electric field reconstruction of 2D coherent spectroscopic signals was achieved.
  • Spatial spectral interferometry (SSI) demonstrated superior performance over FTSI.
  • SSI successfully measured 2D photon echo spectra for systems with varying line widths.

Conclusions:

  • Spatial spectral interferometry (SSI) is a powerful and generalized technique for 4WM signal analysis.
  • SSI eliminates the sensitivity and resolution limitations associated with FTSI.
  • The technique is applicable to diverse systems, including atomic vapors and biomolecules.