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Highly sensitive lock-in thermoreflectance temperature measurement using thermochromic liquid crystal
- Source :
- Applied Physics Letters. 122
- Publication Year :
- 2023
- Publisher :
- AIP Publishing, 2023.
-
Abstract
- We show that the temperature measurement sensitivity in the lock-in thermoreflectance (LITR) can be improved by incorporating a thermochromic liquid crystal (TLC) into a transducer. The quantitatively estimated thermoreflectance coefficient of a TLC/Pt hybrid film depends on the excitation frequency and reaches >2 × 10−2 K−1 at low excitation frequencies, which is two orders of magnitude greater than typical values of 10−4 for metallic films. Using the TLC/Pt film, we detected the temperature changes due to Joule heating and the spin Peltier effect with the temperature resolution of ∼10 μK by the LITR method. We also performed the same measurements for an Au film and found that the temperature resolution for the TLC/Pt film is increased by a factor of >10 compared with that for the Au film despite the low reflected light intensity of the TLC/Pt film.
- Subjects :
- Physics and Astronomy (miscellaneous)
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........764614327f737ccf8d00b7bccbebc410
- Full Text :
- https://doi.org/10.1063/5.0142754