title: Photonic crystal formation on optical nanofibers using femtosecond laser ablation technique.
abstract: 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.
authors: Center for Photonic Innovations, University of Electro-Communications, Tokyo 182-8585, Japan. kali@cpi.uec.ac.jp
authors: K P
authors: KP
authors: Nayak
authors: K
authors: K
authors: Hakuta
mesh_terms: D003460:Crystallization / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D054802:Molecular Imprinting / Q000295:instrumentation*; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D017785:Photons