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Electromagnetic field confined and tailored with a few air holes in a photonic-crystal fiber |
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| Authors: | A M Apetrei J M Moison J A Levenson M Foroni F Poli A Cucinotta S Selleri M Legré M Wegmüller N Gisin K V Dukel’skii A V Khokhlov V S Shevandin Yu N Kondrat’ev C Sibilia E E Serebryannikov A M Zheltikov |
| Institution: | (1) Laboratory of Photonics and Nanostructures, LPN/CNRS, route de Nozay, 91460 Marcoussis, France;(2) Information Engineering Department, University of Parma, Parco Area delle Scienze 181/A, 43100 Parma, Italy;(3) Section de Physique – GAP Optique, University of Geneva, 20, rue de l’Ecole-de-Médecine, 1211 Genève, Switzerland;(4) S.I. Vavilov State Optical Institute, St. Petersburg, 199034, Russia;(5) Dipartimento di Energetica, ‘La Sapienza’ University of Rome, Via A. Scarpa 14, 00161 Rome, Italy;(6) Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Vorob’evy gory, 119992 Moscow, Russia |
| Abstract: | Conventional and scanning near-field optical microscopy techniques are cross referenced to femtosecond nonlinear-optical measurements and finite-element numerical simulations to visualize and analyze a strong confinement of electromagnetic radiation in guided modes of a photonic-crystal fiber with only a few air holes surrounding the fiber core. A nonlinear coefficient of about 120 W−1 km−1 is achieved at the wavelength of 670 nm for a fused-silica fiber with a full hexagonal cycle of closely packed air holes around the fiber core. The removal of a single element from this array of air holes is shown to frustrate field confinement in guided modes, leading to mode leakage. |
| Keywords: | 42 65 Wi 42 81 Qb |
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