Magnetoplasmonic Metasurfaces as a Tunable Platform for Near-Field Radiative Heat Transfer

Magnetoplasmonic resonances combine the properties of magnetic and plasmonic materials, offering unique capabilities in manipulating electromagnetic waves at the nanoscale. These resonances arise from the interaction of plasmons—collective oscillations of free electrons in a material—with external magnetic fields, resulting in tunable optical properties. When applied to near-field heat transfer, magneto plasmonic resonances provide a versatile and adjustable platform that can significantly enhance and control the transfer of thermal energy at the nanoscale.<br/>In this work, we present a theoretical calculation of the near-field heat transfer (NFRHT) modulation by an array of magnetoplasmonic spheres made of InAs on a Si substrate. Spoof plasmons can be generated in an array of nanospheres, and the dispersion relation will depend on the separation of the spheres and their size. This is, the plasmon-polariton dispersion relation can be changed just by the geometry of the system (1). Furthermore, the application of an external magnetic field will excite magnetoplasmons (2) that can be tuned to hybridize with the spoof plasmons of the array of nanoparticles. This hybridization is then used to enhance or decrease the coherent near-field radiative heat transfer. (3). Finally, we will discuss how Near-field thermophotovoltaic devices can benefit from the enhanced and tunable heat transfer properties of magnetoplasmonic materials, improving their efficiency.<br/>In summary, magnetoplasmonic resonances offer a promising platform for tunable near-field heat transfer. They have significant potential for advancing thermal management and energy harvesting technologies at the nanoscale. By exploiting the interplay between magnetic fields and plasmons, researchers can develop highly efficient and controllable thermal systems.<br/>(1) S.G. Castillo-Lopez, R. Esquivel-Sirvent, C. Villarreal, G. Pirruccio, <i>Near-field radiative heat transfer management by subwavelength plasmonic crystals, </i>Appl. Phys. Lett. <b>121</b>, 210708 (2022).<br/>(2) S.G. Castillo-Lopez, A. Marquez, R. Esquivel-Sirvent, <i>Resonant enhancement of the near-field radiative heat transfer in nanoparticles, </i>Phys. Rev. B. <b>105</b>, 155404 (2022).<br/>(3)A. Marquez, R. Esquivel-Sirvent, <i>Terahertz response of plasmonic nanoparticles: Plasmonic Zeeman effect, </i><b>28</b>, 39005 (2020).