No abstract

In this Letter, we propose a symmetric metasurface composed of single-sized amorphous-silicon (a-Si) cuboids tetramer clusters that support two resonances with opposite symmetry, i.e., in-plane magnetic dipole (MD) resonance and in-plane toroidal dipole (TD) resonance governed by symmetry-protected bound states in the continuum (SP-BIC) in the near-infrared region. Since the cuboids tetramer of the metasurface retains C 4 v symmetry and mirror symmetry, both resonances are polarization independent. Multipolar decomposition of scattering power and electromagnetic distribution are performed to clarify the physical mechanism of dual quasi-BIC resonances. The effects of geometric parameters on both high-quality (Q) resonances are also studied. Additionally, the sensing performance of the designed metasurface is evaluated. The effects of the material’s loss on both resonances are also studied. Our work provides a new route to designing dual mode polarization- independent resonators without multi-sized complex structures that may facilitate designing high-performance sensing applications.

We investigate the near-field radiative heat transfer between two semi-infinite magneto-dielectric uniaxial anisotropic media (MDUAM). SiC nanowires embedded in metamaterials are used to implement electric and magnetic anisotropy, which leads to the hyperbolic dispersion relation for both TE and TM waves. The results show that the TM and TE waves can support both hyperbolic modes and surface modes and that there exist additional modes contributing to the heat transfer for TE waves. Moreover, the MDUAM exhibit super-Planckian thermal emission at ultra-broad bandwidths. This work paves the way for applying the near-field radiative heat transfer in the area of thermal management and energy harvesting.

No abstract

No abstract