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Three-Dimensional Finite-Difference Time-Domain Method Modeling of Nanowire Optical Probe

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Abstract:

In this paper, output near fields of nanowires with different optical and structure configurations are calculated by using the three-dimensional finite-difference time-domain (3D FDTD) method. Then a nanowire with suitable near field distribution is chosen as the probe for scanning dielectric and metal nanogratings. Scanning results show that the resolution in near-field imaging of dielectric nanogratings can be as low as 80nm, and the imaging results are greatly influenced by the polarization direction of the incident light. Compared with dielectric nanogratings, metal nanogratings have significantly enhanced resolutions when the arrangement of gratings is perpendicular to the polarization direction of the incident light due to the enhancement effect of the localized surface plasmons (SPs). Results presented here could offer valuable references for practical applications in near-field imaging with nanowires as optical probes.

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Periodical:

Applied Mechanics and Materials (Volumes 602-605)

Pages:

3359-3362

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.602-605.3359

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Online since:

August 2014

Authors:

Chun Li Zhu*, Jing Li

Keywords:

FDTD Method, Nanograting, Nanowire, Surface Plasmons

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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