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Tunable diffraction and self-defocusing in liquid-filled photonic crystal fibers

Christian R. Rosberg, Francis H. Bennet, Dragomir N. Neshev, Per D. Rasmussen, Ole Bang, Wieslaw Krolikowski, Anders Bjarklev, and Yuri S. Kivshar

Open Access Open Access

Abstract

We suggest and demonstrate a novel platform for the study of tunable nonlinear light propagation in two-dimensional discrete systems, based on photonic crystal fibers filled with high index nonlinear liquids. Using the infiltrated cladding region of a photonic crystal fiber as a nonlinear waveguide array, we experimentally demonstrate highly tunable beam diffraction and thermal self-defocusing, and realize a compact all-optical power limiter based on a tunable nonlinear response.

©2007 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Microscope images of (a) the photonic crystal fiber used in the experiment, and (b) section of fiber cladding after infiltration with a high index liquid. (c) Schematic of the experimental setup for coupling of light into the infiltrated PCF. PM — polarization maintaining fiber, xyz — 3D translation stage.

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Fig. 2.
Fig. 2. (a–d) Linear output intensity distribution at temperature 72, 73, 74, and 75 °C, respectively. (e) Output power at the central lattice site measured as a function of temperature.

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Fig. 3.
Fig. 3. (a-d) Output intensity distribution at 74 °C for increasing laser power; (a) corresponds to linear propagation. (e) Output power measured at the central lattice site versus input beam power for weakly absorbing sample.

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Fig. 4.
Fig. 4. (a) Output versus input power at the central lattice site measured at different temperatures for moderately absorbing sample. (b) Corresponding maximum output power as a function of temperature.

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