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Opt Express. 2013 Jan 28;21(2):2480-90. doi: 10.1364/OE.21.002480.

Photonic crystal formation on optical nanofibers using femtosecond laser ablation technique.

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Center for Photonic Innovations, University of Electro-Communications, Tokyo 182-8585, Japan.


We demonstrate that thousands of periodic nano-craters are fabricated on a subwavelength-diameter tapered optical fiber, an optical nanofiber, by irradiating with just a single femtosecond laser pulse. A key aspect of the fabrication is that the nanofiber itself acts as a cylindrical lens and focuses the femtosecond laser beam on its shadow surface. We also demonstrate that the periodic nano-crater array on the nanofiber shows polarization dependent fiber Bragg grating (FBG) characteristics. Such FBG structures on the nanofiber may act as a 1-D photonic crystal due to the strong transverse and longitudinal confinement of the field.

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