Mode evolution and nanofocusing of grating-coupled surface plasmon polaritons on metallic tip
| Autor: | Feng Gao, Dong Mao, Fanfan Lu, Wending Zhang, Shuhai Liang, Jianlin Zhao, Ting Mei, Ligang Huang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Physics::Optics 02 engineering and technology Substrate (electronics) Grating 01 natural sciences 010309 optics plasmonic tip nanofocusing Electric field 0103 physical sciences Polariton Electrical and Electronic Engineering Plasmon business.industry surface plasmon polaritons Conical surface QC350-467 Optics. Light 021001 nanoscience & nanotechnology Surface plasmon polariton Atomic and Molecular Physics and Optics Surfaces Coatings and Films Electronic Optical and Magnetic Materials metal nanostructures electromagnetic field enhancement Optoelectronics 0210 nano-technology business Localized surface plasmon |
| Zdroj: | Opto-Electronic Advances, Vol 1, Iss 6, Pp 180010-1-180010-7 (2018) |
| ISSN: | 2096-4579 |
| DOI: | 10.29026/oea.2018.180010 |
| Popis: | We present a detailed analysis on mode evolution of grating-coupled surface plasmonic polaritons (SPPs) on a conical metal tip based on the guided-wave theory. The eigenvalue equations for SPPs modes are discussed, revealing that cylindrical metal waveguides only support TM01 and HEm1 surface modes. During propagation on the metal tip, the grating-coupled SPPs are converted to HE31, HE21, HE11 and TM01 successively, and these modes are sequentially cut off except TM01. The TM01 mode further propagates with drastically increasing effective mode index and is converted to localized surface plasmons (LSPs) at the tip apex, which is responsible for plasmonic nanofocusing. The gap-mode plasmons can be excited with the focusing TM01 mode by approaching a metal substrate to the tip apex, resulting in further enhanced electric field and reduced size of the plasmonic focus. |
| Databáze: | OpenAIRE |
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