Thermo-optical measurements using quantitative phase microscopy

Quantitative phase microscopy (QPM) literally images the quantitative phase shift associated with image contrast, where the phase shift can be altered by laser heating. In this study, the thermal conductivity and thermo-optic coefficient (TOC) of a transparent substrate are simultaneously determined...

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Bibliographic Details
Published in:Optics letters 2023-06, Vol.48 (12), p.3311-3314
Main Authors: Tanjaya, Nicholaus Kevin, Toda, Keiichiro, Ideguchi, Takuro, Ishii, Satoshi
Format: Article
Language:English
Subjects:
Heat transfer
Image contrast
Laser beam heating
Microscopy
Optical measurement
Phase shift
Substrates
Thermal conductivity
Titanium nitride
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Summary:Quantitative phase microscopy (QPM) literally images the quantitative phase shift associated with image contrast, where the phase shift can be altered by laser heating. In this study, the thermal conductivity and thermo-optic coefficient (TOC) of a transparent substrate are simultaneously determined by measuring the phase difference induced by an external heating laser using a QPM setup. The substrates are coated with a 50-nm-thick titanium nitride film to photothermally generate heat. Then, the phase difference is semi-analytically modeled based on the heat transfer and thermo-optic effect to simultaneously extract the thermal conductivity and TOC. The measured thermal conductivity and TOC agree reasonably well, indicating the potential for measuring the thermal conductivities and TOCs of other transparent substrates. The concise setup and simple modeling differentiate the advantages of our method from other techniques.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.489182