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Appl. Phys. Lett. 91, 173119 (2007); http://dx.doi.org/10.1063/1.2800795 (3 pages)

Optical fuse effect in a tunable liquid crystal waveguide with a Cr grating coupler

C. Kamaga1, Y. Segawa1, S. Tikhodeev2, and T. Ishihara3

1Frontier Research System, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2Frontier Research System, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and General Physics Institute, RAS, Vavilova 38, Moscow 119991 Russia
3Frontier Research System, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan and Department of Physics, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aoba, Sendai 980-8578, Japan

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(Received 6 June 2007; accepted 29 September 2007; published online 25 October 2007)

In this letter, we report on a spontaneous optical switch in a liquid crystal (LC) waveguide with a Cr grating coupler. We propose that this mechanism can be applied as a reusable optical fuse device. The dynamical response of the waveguide mode in the nematic liquid crystal was investigated in the near infrared. An incident continuous wave (cw) laser was used. When the incident intensity is below the threshold, the waveguide mode output intensity is proportional to the input. Above the threshold, the output quenches quickly. The sensitivity and the response speed can be controlled by adjusting the temperature with respect to the phase transition of LC.

© 2007 American Institute of Physics

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KEYWORDS and PACS

PACS

  • 42.65.Pc

    Optical bistability, multistability, and switching, including local field effects

  • 42.79.Gn

    Optical waveguides and couplers

  • 42.70.Df

    Liquid crystals

  • 42.55.Tv

    Photonic crystal lasers and coherent effects

ARTICLE DATA

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

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