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The thermoreflectance thermometry, the temperature measurement through the light reflectance change, is one of the essential methods for measuring temperature changes on the nano- and micro-scales. The small relative change of the reflected light intensity per unit temperature change in thin metal films, used as typical transducers, limits the measurement sensitivity in the thermoreflectance method. We have confirmed that a thermochromic liquid crystal has higher transducer performance than conventional metal films. The lock-in thermoreflectance method with thermochromic liquid crystal enables to detect temperature changes on the order of 10 μK.
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This page is a summary of: Highly sensitive lock-in thermoreflectance temperature measurement using thermochromic liquid crystal, Applied Physics Letters, April 2023, American Institute of Physics,
DOI: 10.1063/5.0142754.
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