Numerical and experimental investigation of wedge tip radius effect on wedge plasmons

Fukui, M., Gramotnev, D., Haraguchi, M., Ogawa, T., Okamoto, T., & Pile, D. (2008) Numerical and experimental investigation of wedge tip radius effect on wedge plasmons. Journal of Applied Physics, 104, 033102-1.

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We report numerical analysis and experimental observation of strongly localized plasmons guided by triangular metal wedges and pay special attention to the effect of smooth (nonzero radius) tips. Dispersion, dissipation, and field structure of such wedge plasmons are analyzed using the compact two-dimensional finite-difference time-domain algorithm. Experimental observation is conducted by the end-fire excitation and near-field scanning optical microscope detection of the predicted plasmons on 40°silver nanowedges with the wedge tip radii of 20, 85, and 125 nm that were fabricated by the focused-ion beam method. The effect of smoothing wedge tips is shown to be similar to that of increasing wedge angle. Increasing wedge angle or wedge tip radius results in increasing propagation distance at the same time as decreasing field localization (decreasing wave number). Quantitative differences between the theoretical and experimental propagation distances are suggested to be due to a contribution of scattered bulk and surface waves near the excitation region as well as the addition of losses due to surface roughness. The theoretical and measured propagation distances are several plasmon wavelengths and are useful for a range of nano-optical applications

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18 citations in Web of Science®

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ID Code: 30737
Item Type: Journal Article
Refereed: Yes
Keywords: Plasmons, Plasmonic Waveguides
DOI: 10.1063/1.2960543
ISSN: 0021-8979
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Photonics Optoelectronics and Optical Communications (020504)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700) > Nanophotonics (100711)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2008 American Institute of Physics
Deposited On: 12 Feb 2010 12:46
Last Modified: 27 Mar 2014 04:39

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