Theoretical analysis of cladding-mode waveguide dispersion and its effects on the spectra of long-period fiber grating

2003 ◽  
Vol 21 (8) ◽  
pp. 1838-1845 ◽  
Author(s):  
H. Jeong ◽  
K. Oh
Keyword(s):  
Theoretical Analysis ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Waveguide Dispersion ◽  
Cladding Mode ◽  
Period Fiber Grating

CO2 laser-written long-period fiber grating with a high diffractive order cladding mode near the turning point

2018 ◽  
Vol 57 (17) ◽  
pp. 4756 ◽  
Author(s):  
Zuyao Liu ◽  
Yunqi Liu ◽  
Chengbo Mou ◽  
Fang Zou ◽  
Tingyun Wang
Keyword(s):  
Co2 Laser ◽  
Turning Point ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Cladding Mode ◽  
Period Fiber Grating

scholarly journals Realization of Enhanced Evanescent Field Long Period Fiber Grating near Turn around Point for Label-Free Immunosensing

Proceedings ◽  
2020 ◽  
Vol 60 (1) ◽  
pp. 9
Author(s):  
Tanoy Kumar Dey ◽  
Sara Tombelli ◽  
Palas Biswas ◽  
Ambra Giannetti ◽  
Nandini Basumallick ◽  
...  
Keyword(s):  
Immunoglobulin G ◽  
Flow Cell ◽  
Evanescent Field ◽  
Fiber Grating ◽  
Label Free ◽  
Maximum Enhancement ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Cladding Mode ◽  
Period Fiber Grating

A long-period fiber grating (LPFG) with maximum enhancement of evanescent field has been designed and fabricated, along with theoretical modeling, by working near the turn-around point (TAP) of the lowest order symmetric cladding mode (LP0.2 cladding mode). The LPFG was fabricated using a point-by-point inscription technique and it was characterized in terms of surrounding refractive index (SRI) within the range of 1.333 to 1.3335 using a thermostated flow-cell. This closed cell, made of poly(methyl methacrylate) (PMMA), was designed for better handling of the sensor, because during the fabrication process, the diameter of the LPFG was reduced up to ~20 µm by chemical etching, for the maximum enhancement of the evanescent field. The sensitivity of dual peak resonance of the LP0.2 cladding mode near TAP was measured and resulted to be ~8751 nm/SRIU with a resolution of the order of 10−5 RIU. The sensor was further used for the label-free immunosensing application by the implementation of Immunoglobulin G (IgG)/anti-Immunoglobulin G (anti-IgG) bioassay in human serum on the grating region inside the thermostated closed flow cell.

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