"Photonic crystal fiber long-period gratings (PCF-LPGs) operating near the phase-matching turning point to achieve high sensitivity to the refractive index of gas and liquid analytes infiltrated into cladding air holes are designed by numerical optimization. The vectorial finite element method is employed for the modal analysis of an index-guiding PCF and the calculation of the phase matching curves. The geometrical parameters of PCF (pitch and diameter of air holes arranged in a periodic triangular array) are optimized by using the down-hill simplex technique to engineer the dispersion of modes coupled by a LPG to obtain the turning point in the phase-matching curve at a desired wavelength for a given analyte refractive index. The resonant wavelength is subsequently extremely sensitive to the analyte refractive index, however, its large shifts can be detected with a substantially reduced resolution because the resonance dip in the LPG transmission spectrum is very broad" . "Praha" . . "Dispersion optimization of photonic crystal fiber long-period gratings for a high-sensitivity refractive index sensing" . . "1"^^ . "Photonic crystal fiber long-period gratings (PCF-LPGs) operating near the phase-matching turning point to achieve high sensitivity to the refractive index of gas and liquid analytes infiltrated into cladding air holes are designed by numerical optimization. The vectorial finite element method is employed for the modal analysis of an index-guiding PCF and the calculation of the phase matching curves. The geometrical parameters of PCF (pitch and diameter of air holes arranged in a periodic triangular array) are optimized by using the down-hill simplex technique to engineer the dispersion of modes coupled by a LPG to obtain the turning point in the phase-matching curve at a desired wavelength for a given analyte refractive index. The resonant wavelength is subsequently extremely sensitive to the analyte refractive index, however, its large shifts can be detected with a substantially reduced resolution because the resonance dip in the LPG transmission spectrum is very broad"@en . . "SPIE" . . "Z(AV0Z20670512)" . "Dispersion optimization of photonic crystal fiber long-period gratings for a high-sensitivity refractive index sensing"@en . . "1"^^ . . "Optical Sensors 2011 and Photonic Crystal Fibers V (Proceedings of SPIE Vol. 8073)" . "2011-04-18+02:00"^^ . . . . "10"^^ . . . . . . "RIV/67985882:_____/11:00374696" . . "Bellingham" . "000293740400067" . "194860" . "surface effects; optical fiber sensors; photonic crystal fibers"@en . "978-0-8194-8663-9" . "RIV/67985882:_____/11:00374696!RIV12-AV0-67985882" . "Dispersion optimization of photonic crystal fiber long-period gratings for a high-sensitivity refractive index sensing"@en . . "Dispersion optimization of photonic crystal fiber long-period gratings for a high-sensitivity refractive index sensing" . "[1FECA19FBD94]" . . "Ka\u0148ka, Ji\u0159\u00ED" .