Nanofocusing of Surface Plasmon Polaritons on Metal-Coated Fiber Tip Under Internal Excitation of Radial Vector Beam
Plasmonics, ISSN: 1557-1963, Vol: 14, Issue: 6, Page: 1593-1599
2019
- 11Citations
- 10Captures
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Article Description
We theoretically present the nanofocusing of the metal-coated fiber tip under internal excitation of the radial vector beam within visible band based on the finite difference time domain (FDTD) analysis. The electric field intensity enhancement factor of the localized surface plasmons (LSP) mode at the tip apex is quantitatively shown in relation with incident wavelength, coating material, conical angle of tip, and coating film thickness/length. Specially, the evolution of fiber radial vector mode to surface mode with respect to the radius of metal-coated fiber tip is calculated under typical excitation wavelengths of 633 nm and 785 nm. Furthermore, the reason of the tip eliminating far-field background signal is explained, and the transverse electric field distributions of LSP mode and the tip-substrate coupling are also given at the optimal excitation wavelength. These calculation results will be a good reference for the fabrication of metal-coated fiber tips and for the experimental design of the tip-enhanced spectroscopy (TES) system.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85065713292&origin=inward; http://dx.doi.org/10.1007/s11468-019-00951-8; http://link.springer.com/10.1007/s11468-019-00951-8; http://link.springer.com/content/pdf/10.1007/s11468-019-00951-8.pdf; http://link.springer.com/article/10.1007/s11468-019-00951-8/fulltext.html; https://dx.doi.org/10.1007/s11468-019-00951-8; https://link.springer.com/article/10.1007/s11468-019-00951-8
Springer Science and Business Media LLC
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