1 December 2017 Modified field confinement and enhanced optical forces in hybrid dielectric wedge tip-loaded plasmonic waveguide
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xiaogang Chen, Xiaogang Chen, Qijing Lu, Qijing Lu, Hongqin Yang, Hongqin Yang, Xiang Wu, Xiang Wu, Shusen Xie, 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 . Submission: Received: 3 August 2017; Accepted: 6 November 2017
Received: 3 August 2017; Accepted: 6 November 2017; Published: 1 December 2017
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