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Pump-probe microscopy in a Sagnac interferometer.

Jonah M Theisen, Erik M Grumstrup

|December 1, 2025

Summary

This summary is machine-generated.

A novel interferometric pump-probe microscope uses counterpropagating beams to detect subtle film morphology variations. This advanced technique enhances signal measurement of transient optical constant changes in materials.

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Area of Science:

Optical microscopy
Materials science
Spectroscopy

Background:

Pump-probe microscopy is a standard technique for studying ultrafast dynamics.
Conventional methods can struggle to detect subtle changes in material properties.
Understanding transient optical properties is crucial for materials characterization.

Purpose of the Study:

To develop and characterize a new interferometric pump-probe microscope.
To enhance sensitivity to local film morphology variations.
To improve the measurement of transient changes in optical constants.

Main Methods:

Development of an interferometric pump-probe microscope utilizing two counterpropagating probe beams.
Characterization of the microscope's performance.
Application to a porphyrin derivative thin film.

Main Results:

The technique demonstrated sensitivity to local film morphology undetectable by conventional methods.
Enhanced signal levels were achieved for measuring transient changes in optical constants.
The method successfully distinguished contributions from real and imaginary components of optical constants.

Conclusions:

The developed interferometric pump-probe technique offers superior sensitivity for materials analysis.
It provides deeper insights into transient optical properties and film morphology.
This advancement has potential applications in advanced materials characterization.