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Passively Stabilized Phase-Resolved Collinear SFG Spectroscopy Using a Displaced Sagnac Interferometer.

Max Lukas¹, Ellen H G Backus^1,2, Mischa Bonn¹

¹Molecular Spectroscopy Department, Max Planck Institute for Polymer Research, 55128 Mainz, Germany.

The Journal of Physical Chemistry. A

|February 3, 2022

Summary

This summary is machine-generated.

Phase-resolved sum-frequency generation (PR-SFG) spectroscopy reveals molecular orientation at interfaces. A new collinear setup using a Sagnac interferometer simplifies this demanding technique, offering stable, accurate measurements.

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Area of Science:

Surface science
Spectroscopy
Physical chemistry

Background:

Sum-frequency generation (SFG) vibrational spectroscopy analyzes molecular interfaces.
Phase-resolved SFG (PR-SFG) provides molecular orientation data.
Existing PR-SFG methods have technical challenges, including sample height control or time delay tuning.

Purpose of the Study:

To develop a simplified collinear PR-SFG setup.
To overcome the limitations of existing noncollinear and collinear PR-SFG techniques.
To enable accurate and stable measurements of interfacial molecular orientation.

Main Methods:

Development of a collinear PR-SFG setup utilizing a displaced Sagnac interferometer.
Independent control of local oscillator time delay and intensity.
Achieving long-time phase stabilization of the detected signal.

Main Results:

The new setup allows full, independent control over the local oscillator.
Demonstrated long-time phase stabilization (better than 5° over 12 h).
Reduced experimental complexity compared to previous methods.

Conclusions:

The displaced Sagnac interferometer offers a robust solution for collinear PR-SFG.
This approach combines the benefits of both collinear and noncollinear PR-SFG techniques.
Simplifies interfacial molecular orientation studies using SFG spectroscopy.