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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 2 — Jan. 28, 2013
  • pp: 1430–1439

Nonlocal effects in a hybrid plasmonic waveguide for nanoscale confinement

Qiangsheng Huang, Fanglin Bao, and Sailing He  »View Author Affiliations

Optics Express, Vol. 21, Issue 2, pp. 1430-1439 (2013)

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The effect of nonlocal optical response is studied for a novel silicon hybrid plasmonic waveguide (HPW). Finite element method is used to implement the hydrodynamic model and the propagation mode is analyzed for a hybrid plasmonic waveguide of arbitrary cross section. The waveguide has an inverted metal nano-rib over a silicon-on-insulator (SOI) structure. An extremely small mode area of~10−6λ2 is achieved together with several microns long propagation distance at the telecom wavelength of 1.55μm. The figure of merit (FoM) is also improved in the same time, compared to the pervious hybrid plasmonic waveguide. We demonstrate the validity of our method by comparing our simulating results with some analytical results for a metal cylindrical waveguide and a metal slab waveguide in a wide wavelength range. For the HPW, we find that the nonlocal effects can give less loss and better confinement. In particular, we explore the influence of the radius of the rib’s tip on the loss and the confinement. We show that the nonlocal effects give some new fundamental limitation on the confinement, leaving the mode area finite even for geometries with infinitely sharp tips.

© 2013 OSA

OCIS Codes
(130.2790) Integrated optics : Guided waves
(240.6680) Optics at surfaces : Surface plasmons
(250.5300) Optoelectronics : Photonic integrated circuits
(260.3910) Physical optics : Metal optics
(160.4236) Materials : Nanomaterials

ToC Category:
Optics at Surfaces

Original Manuscript: November 1, 2012
Revised Manuscript: December 16, 2012
Manuscript Accepted: January 2, 2013
Published: January 14, 2013

Qiangsheng Huang, Fanglin Bao, and Sailing He, "Nonlocal effects in a hybrid plasmonic waveguide for nanoscale confinement," Opt. Express 21, 1430-1439 (2013)

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