电场
旋转对称性
等离子体子
领域(数学)
光学
材料科学
物理
机械
数学
量子力学
纯数学
作者
Fatemeh Salmeh,Masoud Mohebbi
标识
DOI:10.1016/j.photonics.2024.101240
摘要
This study investigates the enhancement and nanofocusing of a radially polarized electric field by a conical plasmonic structure (CPS). The CPS is a dielectric cone with nanometer metal cladding on a dielectric substrate. Concentric circular slanted grooves are etched on the surface of the dielectric substrate. These grooves converge the incident field on the structure. Angled periodic gratings are engraved on the CPS metal surface near the tip, creating a plasmonic momentum and contributing to the field enhancement above the apex. The symmetry of the incident radially polarized light and the structure significantly boosts nanofocusing and field enhancement. The optimal width of the nanofocusing and the electric field enhancement factor obtained are approximately 9 nm and of order of magnitude 5, respectively. Because of its impressive effects, this scheme is a valuable tool for plasmonic, optics, and laser applications.
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