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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 15 — Jul. 28, 2014
  • pp: 18612–18624

Efficient phase-matched third harmonic generation in an asymmetric plasmonic slot waveguide

Tingting Wu, Yunxu Sun, Xuguang Shao, Perry Ping Shum, and Tianye Huang  »View Author Affiliations

Optics Express, Vol. 22, Issue 15, pp. 18612-18624 (2014)

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An asymmetric plasmonic slot waveguide (APSW) for efficient phase-matched third harmonic generation (THG) is proposed and demonstrated theoretically. Nonlinear organic material DDMEBT polymer is integrated into the bottom of the metallic slot, while silicon is used to fill the top of the slot. We introduce the rigorous coupled-mode equations of THG in the lossy APSW and apply them to optimize the waveguide geometry. Taking advantage of the surface plasmon polaritons (SPPs), the electric fields can be tightly confined in the metallic slot region and the nonlinear effect is greatly enhanced accordingly. Then, we investigate the relationships between THG efficiency and parameters such as slot width and height, phase matching condition (PMC), modal overlap related nonlinear parameter, figure-of-merit, pump power and detuning. With the proposed asymmetric waveguide, we demonstrate a high THG conversion efficiency of 4.88 × 10−6 with a pump power of 1 W and a detuning constant of −36 m−1 at a waveguide length of 10.65 𝜇m.

© 2014 Optical Society of America

OCIS Codes
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(190.2620) Nonlinear optics : Harmonic generation and mixing
(250.5403) Optoelectronics : Plasmonics
(250.4390) Optoelectronics : Nonlinear optics, integrated optics

ToC Category:
Nonlinear Optics

Original Manuscript: May 20, 2014
Revised Manuscript: July 5, 2014
Manuscript Accepted: July 6, 2014
Published: July 24, 2014

Tingting Wu, Yunxu Sun, Xuguang Shao, Perry Ping Shum, and Tianye Huang, "Efficient phase-matched third harmonic generation in an asymmetric plasmonic slot waveguide," Opt. Express 22, 18612-18624 (2014)

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