Optimal design of broadband photonic crystal fibre long-period gratings for evanescent absorption sensing

0350216 - ÚFE 2011 RIV US eng C - Conference Paper (international conference)
Kaňka, Jiří
Optimal design of broadband photonic crystal fibre long-period gratings for evanescent absorption sensing.
Photonic Crystal Fibers IV. Bellingham: SPIE, 2010 - (Kalli, K.; Urbanczyk, W.), 77140N-1-77140N-8. ISBN 978-0-8194-8187-0. ISSN 0277-786X.
[SPIE Photonics Europe. Brussels (BE), 12.04.2010-16.04.2010]
R&D Projects: GA ČR GA102/08/1719
Institutional research plan: CEZ:AV0Z20670512
Keywords : Photonic crystal fiber * Long-period grating * Refractive index sensors
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

A photonic crystal fibre (PCF) is numerically optimized to achieve through an inscribed long period grating (LPG) broadband coupling between the fundamental mode (LP01) and the first-order symmetric cladding (LP02-like) mode. The vectorial finite element method and the Nelder-Mead simplex method are used for the optimization of the PCF to get for LP01-LP02 mode coupling the phase matching curve with the dispersion turning point located in the center of a selected range of resonant wavelengths. The bandwidth of a LPG close to the dispersion turning point is large.
Permanent Link: http://hdl.handle.net/11104/0190274