Adiabatic Nanofocusing of Plasmons by Sharp Metallic Grooves: Geometrical Optics Approach
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In this paper, we demonstrate the possibility of efficient adiabatic nano-focusing of gap plasmons by sharp metallic V-grooves or dielectric wedges covered with metal. Geomet-rical optics approach and the approximation of continuous electrodynamics are used for the analysis. In particular, it is demonstrated that both the phase and group velocities of an inci-dent symmetric (with respect to the magnetic field) plasmon tend to zero at the tip of the groove, and the plasmon adiabatically slows down, eventually dissipating in the metal. The amplitude of the plasmon strongly increases near the tip of the groove. However, unlike nano-focusing by a sharp metal conical tip, even in the absence of dissipation, the amplitude of the plasmon near the tip of a V-groove remains finite. The dependence of the maximal local field enhancement on structural parameters, dissipation in the metal, angle of incidence, etc. is ana-lyzed. It is also shown that a symmetric gap plasmon can effectively be guided by the groove, forming a channel plasmon-polariton – a special plasmon mode propagating along the tip of a metallic V-groove. A new existence condition for these strongly localized plasmon-polaritons is derived and discussed.
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ID Code: | 4076 |
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Item Type: | Contribution to Journal (Journal Article) |
Refereed: | Yes |
Measurements or Duration: | 11 pages |
Keywords: | Nano-optics, Near-Field Microscopy, Subwavelength Waveguides, Surface Plasmons |
DOI: | 10.1063/1.2130520 |
ISSN: | 0021-8979 |
Pure ID: | 34301041 |
Divisions: | Past > QUT Faculties & Divisions > Faculty of Health Past > QUT Faculties & Divisions > Faculty of Science and Technology |
Copyright Owner: | Consult author(s) regarding copyright matters |
Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
Deposited On: | 19 Mar 2007 00:00 |
Last Modified: | 03 Mar 2024 06:45 |
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