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arXiv · 2607.13262

Transient Depth Thermography for Probing Heat Transport

Dmitrii Shymkiv·Chun Wang·Yan Jiang·Rajat Srivastava·Nandika D'Souza·Yuzhe Xiao
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Abstract

Directly probing heat propagation inside materials remains challenging because conventional measurements are predominantly sensitive to surface temperature. Depth thermography has enabled non-contact reconstruction of subsurface temperature profiles from spectrally resolved thermal radiation under steady-state conditions. Here, we extend this approach into the time domain, establishing transient depth thermography to resolve the evolution of internal temperature during heat transport. By exploiting wavelength-dependent optical penetration depth, time-resolved thermal-radiation spectra provide access to temperature as a function of both depth and time. Tracking this spatiotemporal temperature field enables direct probing of heat propagation and quantitative determination of out-of-plane thermal conductivity and interfacial thermal resistance. We demonstrate the approach in fused silica, obtaining thermal conductivity within 2% of established values, and measure the temperature-dependent thermal conductivity of MgF2 over a broad temperature range where existing data are sparse and inconsistent. Numerical simulations further demonstrate its extension to multilayer thin films for probing interfacial thermal resistance. By extending depth-resolved thermal spectroscopy from steady-state to transient heat transport, this work establishes a new optical route for non-contact characterization of thermal dynamics in bulk and layered materials.

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Dmitrii Shymkiv, Chun Wang, Yan Jiang, Rajat Srivastava, Nandika D'Souza, Yuzhe Xiao. 2026-07-14. Transient Depth Thermography for Probing Heat Transport. https://arxiv.org/abs/2607.13262

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