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Appl. Phys. Lett. 92, 253306 (2008); http://dx.doi.org/10.1063/1.2949076 (3 pages)

All-optical switching and multistability in photonic structures with liquid crystal defects

Andrey E. Miroshnichenko1, Etienne Brasselet2, and Yuri S. Kivshar1

1Nonlinear Physics Center and Center for Ultra-high bandwidth Devices for Optical Systems (CUDOS), Research School of Physical Sciences and Engineering, Australian National University, Canberra Australian Capital Territory 0200, Australia
2Centre de Physique Optique Moléculaire et Hertzienne, Université Bordeaux 1, CNRS, 351 Cours de la Libération, 33405 Talence Cedex, France

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(Received 30 April 2008; accepted 1 June 2008; published online 26 June 2008)

We demonstrate that one-dimensional photonic crystals with pure nematic liquid-crystal defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fréedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasistatics electric field analog, and it results from nonlinear coupling between light and a defect mode.

© 2008 American Institute of Physics

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

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Figures (click on thumbnails to view enlargements)

FIG.1
(a) Sketch of the multilayers periodic structure with an embedded NLC defect. (b) Transmission spectra of the unperturbed system (red) and normalized OFT threshold (blue).

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(a) Reorientation diagram for positive (blue) and negative (black) detuning δ = ±0.25 nm around λd = 532.75 nm. Solid (dashed) lines refers to stable (unstable) states. Corresponding dynamics for (b) δ>0 and (c) δ<0 of the phase delay Δ and pump light transmission for square-shaped temporal excitation with ρ = 1.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(a) Multistable reorientation diagram for positive detuning at λp = 537 nm. Solid (dashed) lines refers to stable (unstable) states. (b) Corresponding dynamics of pump light transmission for triangle-shaped temporal excitation.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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