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Journal of Nanophotonics

Modified field confinement and enhanced optical forces in hybrid dielectric wedge tip-loaded plasmonic waveguide
Author(s): Xiaogang Chen; Qijing Lu; Hongqin Yang; Xiang Wu; Shusen Xie
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Paper Abstract

We proposed and theoretically investigated a hybrid plasmonics waveguide consisting of a tiptilted quadrate nanowire, which was embedded in a low-permittivity dielectric and placed on a metal substrate with a small gap distance. Due to the corner effect, the hybrid mode with extremely local field enhancement has the long propagation length and strong coupling strength between the dielectric nanowire and metal. By employing the simulations with different geometric parameters, the proposed waveguide can obtain better performances than the previous hybrid plasmonics waveguide, particularly in the subwavelength confinement (as small as λ 2 / 1600 ), long-range propagation (millimeter range), and optical trapping forces ( 2.12    pN / W ). The use of a naturally dielectric wedge tip of quadrate nanowire that can be chemically synthesized provides an efficient approach to circumvent the fabrication difficulty of shape wedge tips. The present structure provides an excellent platform for nanophotonic waveguides, nanolasers, nanoscale optical tweezers, and biosensing.

Paper Details

Date Published: 1 December 2017
PDF: 10 pages
J. Nanophoton. 11(4) 046015 doi: 10.1117/1.JNP.11.046015
Published in: Journal of Nanophotonics Volume 11, Issue 4
Show Author Affiliations
Xiaogang Chen, Key Lab. of Optoelectronic Science and Technology for Medicine, Fujian Normal Univ. (China)
Qijing Lu, Key Lab. of Optoelectronic Science and Technology for Medicine, Fujian Normal Univ. (China)
Hongqin Yang, Key Lab. of Optoelectronic Science and Technology for Medicine, Fujian Normal Univ. (China)
Xiang Wu, Key Lab. for Micro and Nano Photonic Structures, Fudan Univ. (China)
Shusen Xie, Key Lab. of Optoelectronic Science and Technology for Medicine, Fujian Normal Univ. (China)


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