2017/06/22 by Viktoriia E. Babicheva, Babicheva, Viktoriia E.
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Metamaterials and Metasurfaces Applications #Optics (physics.optics) #Orbital Angular Momentum in Optics #Plasmonic and Surface Plasmon Research
paper · pdf · doi:10.48550/arxiv.1706.07259
openalex publication_date 2017/06/22 · openalex created_date 2022/09/02 · openalex updated_date 2026/07/28
We propose to use optical antennas made out of natural hyperbolic material\nhexagonal boron nitride (hBN), and we demonstrate that this medium is a\npromising alternative to plasmonic and all-dielectric materials for realizing\nefficient subwavelength scatterers and metasurfaces based on them. We\ntheoretically show that particles out of hyperbolic medium possess different\nresonances enabled by the support of high-k waves and their reflection from the\nparticle boundaries. Among those resonances, there are electric quadrupole\nexcitations, which cause magnetic resonance of the particle similar to what\noccurs in high-refractive-index particles. Excitations of the particle\nresonances are accompanied by the drop in the reflection from nanoparticle\narray to near-zero value, which can be ascribed to resonant Kerker effect. If\nparticles are arranged in the spacer array with period d, narrow lattice\nresonances are possible at wavelength d, d/2, d/3 etc. This provides an\nadditional degree of control and possibility to excite resonances at the\nwavelength defined by the array spacing. For the hBN particle with hyperbolic\ndispersion, we show that the full range of the resonances, including magnetic\nresonance and a decrease of reflection, is possible.\n