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In the present study, we demonstrate a vacuum thermal switch based onnear-field thermal radiation between phase transition materials, i.e., vanadiumdioxide (VO2), whose phase changes from insulator to metal at 341 K. Similarmodulation effect has already been demonstrated and it will be extended tothin-film structure with substrate in this paper. Strong coupling of surfacephonon polaritons between two insulating VO2 plates significantly enhances thenear-field heat flux, which on the other hand is greatly reduced when the VO2emitter becomes metallic, resulting strong thermal switching effect.Fluctuational electrodynamics predicts more than 80% heat transfer reduction atsub-30-nm vacuum gaps and 50% at vacuum gap of 1 micron. By replacing the bulkVO2 receiver with a thin film of several tens of nanometers, the switchingeffect can be further improved over a broad range of vacuum gaps from 10 nm to1 um. In addition, for the purpose of more practical setup in experiments andapplications, the SiO2 substrate effect is also considered for the structurewith thin-film emitter or receiver.

Vacuum Thermal Switch Made of Phase Transition Materials Considering Thin Film and Substrate Effects