Abstract

Magneto-optical (MO) materials exhibit substantial potential in the active control of near-field radiative heat transfer (NFRHT) under different magnetic field intensities up to several tesla. However, it is difficult to realize such high intensities in applications. In view of this, we theoretically investigate the NFRHT between the dual MO graphene/InSb core-shell (GICS) nanoparticles-based metamaterials under weak magnetic fields smaller than 0.5 T. We find that the maximum relative thermal magnetoresistance ratio can be 64% at H = 0.1 T, which is attributed to the split polarizabilities into different directions and the weakened dipole resonances. Meanwhile, the magnetoplasmon polaritons and the magnetization-induced hyperbolic modes play a dominate role in the control of NFRHT. For comparison, the spectral heat transfer coefficients of InSb and graphene shell nanoparticles-based metamaterials are shown. This study helps the understanding of the physical mechanisms behind the NFRHT of dual MO materials and facilitates the application of magnetic field-controlled devices.

© 2022 Optica Publishing Group

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