TY - GEN
T1 - Numerical analysis and experimental investigation of highly sensitive photonic crystal fiber long-period grating refractive index sensor
AU - He, Zonghu
AU - Zhu, Yinian
AU - Kaňka, Jiří
AU - Du, Henry
PY - 2007
Y1 - 2007
N2 - In this paper, we present the numerical analyses of modal coupling properties and resonance spectral response of longperiod gratings (LPGs) in solid-core photonic crystal fibers (PCFs) with respect to their sensitivity to refractive indices of measurands in the air channels using a full-vectoral mode solver combined with frequency-domain method. The calculated results show that the wavelength resonance of a PCF-LPG can be extremely sensitive to the refractive index change. The PCF-LPG refractive index sensors, inscribed by residual stress relaxation using a scanning CO2 laser, are also experimentally investigated in terms of resonance shift with the PCF-LPG structure filled with sodium chloride (NaCl) solutions at concentrations ranging from 0-26% (w/w). The spectral features were greatly improved by inscribing the LPG structure in PCF prefilled with water. The PCF-LPG sensors are shown to be able to detect the change of ∼10-7 refractive index unit (RIU) in the index range of 1.33 to 1.35, in a good agreement with the numerical simulation.
AB - In this paper, we present the numerical analyses of modal coupling properties and resonance spectral response of longperiod gratings (LPGs) in solid-core photonic crystal fibers (PCFs) with respect to their sensitivity to refractive indices of measurands in the air channels using a full-vectoral mode solver combined with frequency-domain method. The calculated results show that the wavelength resonance of a PCF-LPG can be extremely sensitive to the refractive index change. The PCF-LPG refractive index sensors, inscribed by residual stress relaxation using a scanning CO2 laser, are also experimentally investigated in terms of resonance shift with the PCF-LPG structure filled with sodium chloride (NaCl) solutions at concentrations ranging from 0-26% (w/w). The spectral features were greatly improved by inscribing the LPG structure in PCF prefilled with water. The PCF-LPG sensors are shown to be able to detect the change of ∼10-7 refractive index unit (RIU) in the index range of 1.33 to 1.35, in a good agreement with the numerical simulation.
KW - Fiber Bragg gratings
KW - Holey fibers
KW - Long-period gratings
KW - Microstructured optical fibers
KW - Photonic crystal fibers
KW - Refractive index sensors
KW - Refractometers
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U2 - 10.1117/12.734568
DO - 10.1117/12.734568
M3 - Conference contribution
AN - SCOPUS:42449104031
SN - 9780819469274
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III
T2 - Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III
Y2 - 9 September 2007 through 11 September 2007
ER -