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Journal of Nanophotonics

Investigation of propagation properties of plasmonic nanostructures with nonparaxial Gaussian beam illumination
Author(s): Yongqi Fu; Wei Zhou; Lennie Enk Ng Lim; Chunlei Du; Xiangang Luo
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Paper Abstract

An optical probe with a single aperture flanked by depth-tuned grooves is presented. It is employed as an example to investigate propagation properties of the plasmonic nanostructures with a nonparaxial Gaussian beam illumination. The propagation through the subwavelength aperture is the process that a near-field diffraction of the Gaussian beam interferes with the surface plasmon polaritons (SPP) wave induced wavelets on surface of the grooves. An enhanced optical transmission at the exit side of a subwavelength aperture and a degraded reflection at top side of the compound dielectric/metal nanostructure (air/glass/C/Ag/air) of the probe can be generated with this illumination. Characteristics of the Gaussian beam illumination have been studied numerically via analysis of the transmission and reflection issues. In contrast, the results for plane wave illumination were given as well. Two-dimensional (2D) finite-difference time-domain (FDTD) algorithm is employed for the 2D simulation.

Paper Details

Date Published: 1 May 2007
PDF: 13 pages
J. Nanophoton. 1(1) 013511 doi: 10.1117/1.2748428
Published in: Journal of Nanophotonics Volume 1, Issue 1
Show Author Affiliations
Yongqi Fu, Nanyang Technological Univ. (Singapore)
Wei Zhou, Nanyang Technological Univ. (Singapore)
Lennie Enk Ng Lim, Nanyang Technological Univ. (Singapore)
Chunlei Du, Institute of Optics and Electronics (China)
Xiangang Luo, Institute of Optics and Electronics (China)

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