2012/11/01 by Alexander E. Krasnok, Krasnok, Alexander E., Dmitry S. Filonov +12
Engineering · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #Classical Physics (physics.class-ph) #FOS: Physical sciences #Near-Field Optical Microscopy #Optics (physics.optics) #Plasmonic and Surface Plasmon Research #physics.class-ph #physics.optics
paper · pdf · doi:10.48550/arxiv.1211.0230
arxiv created 2012/11/01 · openalex publication_date 2012/11/01 · arxiv updated 2012/11/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We demonstrate a simple way to achieve superdirectivity of electrically small antennas based on a spherical dielectric particle with a notch. We predict this effect theoretically for nanoantennas excited by a point-like emitter located in the notch, and then confirm it experimentally at microwaves for a ceramic sphere excited by a small wire dipole. We explain the effect of superdirectivity by the resonant excitation of high-order multipole modes of electric and magnetic fields which are usually negligible for small perfect spherical particles.