Design of near-field radiative heat transfer measurement system for superconducting films in cryogenic temperature

Abstract With the miniaturization and increased efficiency of electronic devices, near-field radiative heat transfer (NFRHT) has become a crucial factor in thermal management studies. In recent studies, the strong suppression of NFRHT through superconducting transition offers a novel approach to thermal management technology, which the comprehensive understanding of the NFRHT behaviour between the superconductors is needed. Therefore, it is necessary to develop a reliable NFRHT measurement system for superconducting films in cryogenic temperature. In this work, a cryogenic NFRHT measurement system based on LN 2 was been introduced. We present a theoretical investigation of a pre-designed device, including its measurement principles, system design and temperature simulations. The accuracy verification experiment of gap measurement has been carried. Combined with the theoretical simulation and the experimental result, the combined unaccuracy of the home-built device is 1.166%, with the maximum error in the measured gap size was 1.156% and the temperature measurement error was 0.039%.