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Related Experiment Video

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Phase-Sensitive Sum-Frequency Generation Measurements Using a Femtosecond Nonlinear Interferometer.

Shumei Sun1,2, Patrick J Bisson3, Mischa Bonn1

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|April 6, 2019
PubMed
Summary

This study introduces a femtosecond laser-based nonlinear interferometer for phase-sensitive sum-frequency spectroscopy. The method accurately determines interfacial vibrational structure, matching traditional techniques while offering potential improvements.

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Area of Science:

  • Surface science
  • Nonlinear optics
  • Spectroscopy

Background:

  • Phase-sensitive sum-frequency spectroscopy (SFG) is crucial for understanding interfacial vibrational structure.
  • Accurate determination of the nonlinear susceptibility (χ(2)) phase is essential for precise interfacial analysis.
  • Previous methods utilized picosecond lasers and nonlinear interferometry.

Purpose of the Study:

  • To implement and evaluate nonlinear interferometry using a femtosecond laser system for broadband SFG.
  • To determine the phase of the vibrational response from a self-assembled monolayer (SAM) of octadecanethiol on gold.
  • To compare the femtosecond nonlinear interferometer results with traditional heterodyne-detected phase measurements.

Main Methods:

  • Utilized a femtosecond laser system for broadband sum-frequency generation.
  • Employed a nonlinear interferometer to measure the phase of the interfacial vibrational response.
  • Performed comparative analysis with heterodyne-detected phase measurements.

Main Results:

  • Successfully determined the phase spectrum of the octadecanethiol SAM on gold using the femtosecond nonlinear interferometer.
  • Obtained phase spectra and phase uncertainties comparable to traditional heterodyne methods.
  • Identified the origins of phase uncertainties in the measurements.

Conclusions:

  • Femtosecond nonlinear interferometry is a viable and effective technique for phase-sensitive SFG.
  • The developed method provides results consistent with established techniques.
  • Understanding phase uncertainties can guide future advancements in interfacial spectroscopy.