2020/05/20 by Bruno Miranda, Vincenzo D’Ambrosio, Miranda, Bruno +8
Engineering · Physics and Astronomy · #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Microwave and Dielectric Measurement Techniques #Optics (physics.optics) #Plasma Diagnostics and Applications #physics.optics
paper · pdf · doi:10.48550/arxiv.2005.10358
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openalex publication_date 2020/05/20 · arxiv created 2020/05/26 · arxiv updated 2020/05/27 · openalex created_date 2020/05/29 · openalex updated_date 2026/07/28
Concentrating light within subwavelength spatial regions is a central topic in nanophotonics. In this letter, we introduce a general principle for the subwavelength localization and enhancement of electric fields in high-index resonators, based on the flux conservation of the displacement current density. We apply this design rule to a ring resonator by locally squeezing its section: since the flux is conserved, the electric field is necessarily enhanced to compensate the reduction of the section area. The introduced principle may constitute an important step toward the control of the displacement current density at the nanoscale, guiding the design of the topology and the geometry of complex dielectric structures.