A novel contactless technique for thermal field mapping and thermal conductivity determination: Two-Laser Raman Thermometry

J. S. Reparaz, E. Chavez-Angel, M. R. Wagner, B. Graczykowski, J. Gomis-Bresco, F. Alzina, C. M. Sotomayor Torres

    Research output: Contribution to journalArticleResearchpeer-review

    60 Citations (Scopus)

    Abstract

    We present a novel contactless technique for thermal conductivity determination and thermal field mapping based on creating a thermal distribution of phonons using a heating laser, while a second laser probes the local temperature through the spectral position of a Raman active mode. The spatial resolution can be as small as 300 nm, whereas its temperature accuracy is ±2 K. We validate this technique investigating the thermal properties of three free-standing single crystalline Si membranes with thickness of 250, 1000, and 2000 nm. We show that for two-dimensional materials such as free-standing membranes or thin films, and for small temperature gradients, the thermal field decays as T(r) â̂©2014 AIP Publishing LLC.
    Original languageEnglish
    Article number034901
    JournalReview of Scientific Instruments
    Volume85
    Issue number3
    DOIs
    Publication statusPublished - 1 Jan 2014

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