Modulating Near-Field Radiative Heat Transfer through Thin Dirac Semimetal Films. Issue 2 (3rd April 2021)

• Record Type: Journal Article
• Authors: Xu, Guoding; Sun, Jian; Mao, Hongmin; Cao, Zhaoliang; Ma, Xiying
• Is Part Of: Nanoscale and microscale thermophysical engineering. Volume 25:Issue 2(2021)
• Page Start: 101
• Page End: 115
• Publication Date: 2021-04-03
• Subjects: Heat transfer coefficient (HTC) -- modulation contrast -- dirac semimetal (DSM) film -- degenerate factor -- surface plasmon/phonon polaritons (SPPs/SPhPs); Heat -- Transmission -- Periodicals; Heat -- Transmission; Electronic journals; Periodicals; 621.402
• DOI: 10.1080/15567265.2021.1926607
• Languages: English
• ISSNs: 1556-7265

Abstract

ABSTRACT: We propose a thermal modulation structure made of two identical SiO2 slabs coated by Dirac semimetal (DSM) films and separated by a nanoscale vacuum gap. The energy transmission probability reveals that the coupled surface plasmon polaritons (SPPs) between the two DSM films, and the surface phonon polaritons (SPhPs) supported by the SiO2 substrate can vary sensitively with the Fermi level, the degenerate factor of 3D Dirac points and the thickness of the DSM film, thus providing the possibilities for modulating the radiative heat transfer by tuning these parameters. Based on Maxwell's equations incorporating fluctuational electrodynamics, the effects of these parameters on the heat transfer coefficient and the thermal modulation contrast are numerically analyzed. Under proper parameters, higher modulation contrasts are obtained by continuously tuning the Fermi level from 0.05 eV to 0.3 eV. The obtained results might be helpful in designing a DSM-based thermal modulator with higher modulation contrasts.