What question did this study set out to answer?

This research aims to measure the thickness of 2D superconducting flakes using optical contrast methods.

April 1, 2026Open Access

Optical determination of the thickness of 2D flakes of the superconductor

GMG. A. Mogensen DPD. J. Perez-Morelo GRG. Rozas

Key Points

This research aims to measure the thickness of 2D superconducting flakes using optical contrast methods.
Conducted optical contrast measurements under controlled atmospheric conditions.
Utilized optical interference models to analyze samples of FeSe ranging from 5 to 300 nm.
Calculated refractive index as a function of wavelength based on the optical contrast.
Developed optical contrast maps to assess sample thickness and degradation.
Demonstrated that calculated optical contrast maps are effective for detecting thinner flakes.
Highlighted sensitivity of optical contrast to small variations in complex refractive index.
Established a method to monitor sample degradation through optical contrast measurements.

Abstract

We present optical contrast measurements under a controlled atmosphere on samples of FeSe with thicknesses ranging from 5 to 300 nm. The results are described using optical interference models that allow to obtain the material's refractive index as a function of wavelength. The calculated optical contrast maps have shown to be sensitive for thinner flakes under small variations of the complex refractive index. Also from these kind of maps we show that it is possible to monitor sample degradation using optical contrast measurements.

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