Modified field confinement and enhanced optical forces in hybrid dielectric wedge tip-loaded plasmonic waveguide

Xiaogang Chen; Qijing Lu; Hongqin Yang; Xiang Wu; Shusen Xie

doi:10.1117/1.JNP.11.046015

1 December 2017 Modified field confinement and enhanced optical forces in hybrid dielectric wedge tip-loaded plasmonic waveguide

Xiaogang Chen, Qijing Lu, Hongqin Yang, Xiang Wu, Shusen Xie

Author Affiliations +

Journal of Nanophotonics, Vol. 11, Issue 4, 046015 (December 2017). https://doi.org/10.1117/1.JNP.11.046015

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 λ2/1600), 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.

Citation Download Citation

Xiaogang Chen, Qijing Lu, Hongqin Yang, Xiang Wu, and Shusen Xie "Modified field confinement and enhanced optical forces in hybrid dielectric wedge tip-loaded plasmonic waveguide," Journal of Nanophotonics 11(4), 046015 (1 December 2017). https://doi.org/10.1117/1.JNP.11.046015

Received: 3 August 2017; Accepted: 6 November 2017; Published: 1 December 2017

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