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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 19 — Sep. 15, 2008
  • pp: 14979–14986

Significant enhancement of broadband optical limiting behavior using off-resonant sub-wavelength coupled plasmonic waves

Chao-Yi Tai, Sheng Hsiung Chang, and TsenChieh Chiu  »View Author Affiliations

Optics Express, Vol. 16, Issue 19, pp. 14979-14986 (2008)

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We present the numerical investigation of the optical limiting behavior based on coupled nonlinear plasmonic waveguides. Exploiting the strong localization of the electromagnetic fields at metal-dielectric interfaces, significant enhancement of the nonlinear absorption was achieved. Two types of optical limiters (OLs), one based on the enhanced optical Kerr (OK) effect and the other based on the enhanced two-photon absorption (TPA), are proposed. Their transmission characteristics at off-resonant band of Au are investigated. The simulation results reveal that the linear transmittances in both cases are higher than 85%, and the limiting thresholds are 250 GW/cm2 and 42.69 GW/cm2 for the OK and TPA based OLs, respectively. As compared with the non-structured slab waveguides, the optical limiting thresholds are greatly reduced. Wideband operation over 200 nm was confirmed and TPA induced free carrier absorption (FCA) discussed.

© 2008 Optical Society of America

OCIS Codes
(130.4310) Integrated optics : Nonlinear
(190.0190) Nonlinear optics : Nonlinear optics
(230.4320) Optical devices : Nonlinear optical devices
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: May 23, 2008
Revised Manuscript: August 7, 2008
Manuscript Accepted: September 3, 2008
Published: September 9, 2008

Chao-Yi Tai, Sheng Hsiung Chang, and TsenChieh Chiu, "Significant enhancement of broadband optical limiting behavior using off-resonant sub-wavelength coupled plasmonic waves," Opt. Express 16, 14979-14986 (2008)

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