Thermal Homeostasis Device Using Phase-Change Materials

Wu, Shao-Hua; Chen, Ming-Kun; Barako, Michael T.; Janković, Vladan; Hon, Philip W. C.; Sweatlock, Luke A.; Povinelli, Michelle L.

doi:10.1364/cleo_si.2017.sm3n.7

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2018

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“…For example, thin-films of VO 2 on sapphire experimentally show a strong modulation of emissivity upon phase transition [20]. Related concepts to thermal runaway such as bi-stability [21], thermal rectification [22]- [31], and thermal regulation or homeostasis [32] have been investigated in a variety of radiative systems. However, our work is the first experimental demonstration of thermal runaway in a radiative system.…”

Section: Introductionmentioning

confidence: 99%

Radiative Thermal Runaway Due to Negative-Differential Thermal Emission Across a Solid-Solid Phase Transition

et al. 2018

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Thermal runaway occurs when a rise in system temperature results in heat generation rates exceeding dissipation rates. Here we demonstrate that thermal runaway occurs in thermal radiative systems, given a sufficient level of negative differential thermal emission. By exploiting the insulator-to-metal phase transition of vanadium dioxide, we show that a small increase in heat generation (e.g., 10 nW/mm 2 ) can result in a large change in surface temperature (e.g., ~35 K), as the thermal emitter switches from high emissivity to low emissivity. While thermal runaway is typically associated with catastrophic failure mechanisms, detailed understanding and control of this phenomenon may give rise to new opportunities in infrared sensing, camouflage, and rectification.

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