The Observation of Plasmonic Talbot Effect at Non-Illumination Side of Groove Arrays

The Observation of Plasmonic Talbot Effect at Non-Illumination Side of Groove Arrays Talbot effect in a metallic groove array is observed numerically based on finite element method (FEM) and verified theoretically based on non-paraxial approximation. Grooves in the metallic layer are separated from backside with a narrow gap that is smaller than surface plasmon (SP) penetration depth in metal. At certain circumstances, SPs tunnel through the gap and constructively interfere beneath the metallic layer. In propagation pattern, called Talbot carpet, self-images at certain distances in a periodic row parallel the metallic layer are formed. The distance, called Talbot distance, is coincident with non-paraxial approximation result. To evaluate the periodicity of revivals, new parameters such as R-square, contrast, and image size are introduced. Afterwards, influence of the structural parameters such as groove size, period, and gap thickness on the light intensity is analyzed and proper values for near-infrared wavelength range is determined. We anticipate that our finding reveals better understanding of SP tunneling and paves a way toward utilization of this effect in Talbot effect attributed applications, particularly image processing. . . Keywords Surface plasmons Talbot and self-imaging effects Groove array Introduction Because Talbot effect is a wave optics phenomenon, it is expected to be observed in all kinds of optical waves http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plasmonics Springer Journals

The Observation of Plasmonic Talbot Effect at Non-Illumination Side of Groove Arrays

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Chemistry; Biotechnology; Nanotechnology; Biological and Medical Physics, Biophysics; Biochemistry, general
ISSN
1557-1955
eISSN
1557-1963
D.O.I.
10.1007/s11468-018-0765-8
Publisher site
See Article on Publisher Site

Abstract

Talbot effect in a metallic groove array is observed numerically based on finite element method (FEM) and verified theoretically based on non-paraxial approximation. Grooves in the metallic layer are separated from backside with a narrow gap that is smaller than surface plasmon (SP) penetration depth in metal. At certain circumstances, SPs tunnel through the gap and constructively interfere beneath the metallic layer. In propagation pattern, called Talbot carpet, self-images at certain distances in a periodic row parallel the metallic layer are formed. The distance, called Talbot distance, is coincident with non-paraxial approximation result. To evaluate the periodicity of revivals, new parameters such as R-square, contrast, and image size are introduced. Afterwards, influence of the structural parameters such as groove size, period, and gap thickness on the light intensity is analyzed and proper values for near-infrared wavelength range is determined. We anticipate that our finding reveals better understanding of SP tunneling and paves a way toward utilization of this effect in Talbot effect attributed applications, particularly image processing. . . Keywords Surface plasmons Talbot and self-imaging effects Groove array Introduction Because Talbot effect is a wave optics phenomenon, it is expected to be observed in all kinds of optical waves

Journal

PlasmonicsSpringer Journals

Published: May 29, 2018

References

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