Field-enhanced nanofocusing of radially polarized light by a tapered hybrid plasmonic waveguide with periodic grooves

This study reports the field-enhanced nanofocusing of radially polarized light by tapered hybrid plasmonic waveguide (THPW) with periodic grooves. The THPW consists of a conical high-index dielectric cone, a sandwiched low-index dielectric thin layer, and a metal cladding. The axially symmetric 3D f...

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Veröffentlicht in:Applied optics (2004) 2019-01, Vol.58 (3), p.588-592
Hauptverfasser: Xu, Ji, Li, Kang, Zhang, Sicheng, Lu, Xinyi, Shi, Nannan, Tan, Zhaohuan, Lu, Yunqing, Liu, Ning, Zhang, Baifu, Liang, Zhongcheng
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container_end_page 592
container_issue 3
container_start_page 588
container_title Applied optics (2004)
container_volume 58
creator Xu, Ji
Li, Kang
Zhang, Sicheng
Lu, Xinyi
Shi, Nannan
Tan, Zhaohuan
Lu, Yunqing
Liu, Ning
Zhang, Baifu
Liang, Zhongcheng
description This study reports the field-enhanced nanofocusing of radially polarized light by tapered hybrid plasmonic waveguide (THPW) with periodic grooves. The THPW consists of a conical high-index dielectric cone, a sandwiched low-index dielectric thin layer, and a metal cladding. The axially symmetric 3D finite element method is used to investigate the nanofocusing effect. Under radially polarized illumination at 632.8 nm, strongly enhanced nanofocusing occurs. The hybrid plasmonic structure effectively reduces the energy loss and improves the field enhancement nearly 554 times. Furthermore, periodic grooves are constructed on the metallic surface of the THPW, satisfying the phase-matching condition, and they couple the light energy from the inside to the outside. Finally, an optimized nanofocusing performance with field enhancement of approximately 1810 times is obtained. The results offer an important reference for designing related photonic devices, and the proposed scheme could be potentially exploited in the application of light-matter interactions.
doi_str_mv 10.1364/AO.58.000588
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source Alma/SFX Local Collection; Optica Publishing Group Journals
subjects Clad metals
Cladding
Energy dissipation
Finite element method
Grooves
Phase matching
Photonics
Polarized light
title Field-enhanced nanofocusing of radially polarized light by a tapered hybrid plasmonic waveguide with periodic grooves
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