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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

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Accurate THz ellipsometry using calibration in time domain.

Zahra Mazaheri¹, Can Koral^1,2, Antonello Andreone^3,4

¹Department of Physics "E. Pancini", University of Naples "Federico II", 80126, Naples, Italy.

Scientific Reports

|May 5, 2022

Summary

This summary is machine-generated.

We developed a new terahertz time-domain spectroscopic ellipsometer (THz-TDSE) with an advanced calibration method for precise material characterization. This technique accurately analyzes materials, even those with high absorption rates, using THz-TDSE.

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Area of Science:

Terahertz (THz) spectroscopy
Ellipsometry
Materials science

Background:

Terahertz time-domain spectroscopic ellipsometry (THz-TDSE) is a powerful technique for material characterization.
Accurate calibration is crucial for reliable THz-TDSE measurements, but existing methods have limitations.

Purpose of the Study:

To develop and validate a customized THz-TDSE system with a novel, fast, and effective algorithm-assisted calibration method.
To enable accurate material parameter extraction across a wide range of incident angles and material types.

Main Methods:

A fiber-coupled photoconductive antenna-based THz-TDSE was customized for flexible operation (ellipsometry and transmission).
A new time-domain calibration algorithm was developed to compensate for system non-idealities and minimize errors.
The calibration procedure was validated by comparing THz-TDSE measurements with conventional THz spectroscopy on various solid and liquid samples.

Main Results:

The developed THz-TDSE system operates effectively across a wide range of incident angles.
The algorithm-assisted calibration method significantly improves accuracy by compensating for system imperfections.
Validated measurements demonstrate the technique's effectiveness for characterizing materials, particularly those with high absorption rates.

Conclusions:

The customized THz-TDSE with the novel calibration procedure offers a precise and versatile tool for material characterization.
This technique overcomes limitations of conventional transmission spectroscopy for highly absorbing materials.
The validated method enhances the reliability and applicability of THz-TDSE in scientific research.