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Updated: May 14, 2026

Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

Note: Focus error detection device for thermal expansion-recovery microscopy (ThERM).

E A Domené¹, O E Martínez

¹Laboratorio de Electrónica Cuántica, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.

The Review of Scientific Instruments

|February 8, 2013

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This study introduces a novel focus error detection method for accurately measuring thermal diffusivity. The technique achieves high resolution by isolating surface curvature effects, enabling precise material property analysis.

Area of Science:

Materials Science
Optical Metrology
Thermal Analysis

Background:

Surface curvature variations can interfere with optical measurements.
Existing methods may be affected by thermoreflectance and photodefelection.
Accurate measurement of thermal diffusivity is crucial for material characterization.

Purpose of the Study:

To develop a focus error detection method insensitive to thermoreflectance and photodefelection.
To enable precise measurement of thermal diffusivity with high spatial resolution.
To utilize an astigmatic probe laser and four-quadrant detector for surface analysis.

Main Methods:

Implementing an astigmatic probe laser and a four-quadrant detector for focus error detection.
Applying nonlinear curve fitting to the defocusing signal to determine a cutoff frequency.

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Last Updated: May 14, 2026

Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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Isolating surface curvature variations to cancel interfering optical effects.

Main Results:

The developed method is solely sensitive to surface curvature variations.
A cutoff frequency dependent only on thermal diffusivity and pump beam size is retrieved.
Microscopic lateral resolution and high axial resolution (~100 pm) are achieved.

Conclusions:

A straightforward method for retrieving thermal diffusivity with high resolution is presented.
The technique effectively cancels confounding thermoreflectance and photodefelection effects.
This innovation offers precise material property analysis capabilities.