Temperature and surrounding refractive index insensitive cascaded long period grating chemical sensor

2014 ◽  
Author(s):  
S. Korposh ◽  
S. W. James ◽  
Seung-Woo Lee ◽  
R. P. Tatam
Keyword(s):  
Refractive Index ◽  
Chemical Sensor ◽  
Long Period Grating ◽  
Long Period ◽  
Surrounding Refractive Index

scholarly journals Sensing Characteristics of Side-Hole Fiber-Based Long-Period Grating

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yi Xin ◽  
Xinyong Dong ◽  
Junwei Yuan ◽  
Yi Li ◽  
Shangzhong Jin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Blue Shift ◽  
Effective Index ◽  
Long Period Grating ◽  
Side Hole ◽  
Long Period ◽  
Long Period Gratings ◽  
Laser Sensing ◽  
Surrounding Refractive Index ◽  
Sensing Characteristics

Long-period gratings (LPGs) have been fabricated in a side-hole fiber (SHF) by using a pulsed CO2laser. Sensing characteristics of this SHF-LPG to temperature surrounding refractive index and bend have been investigated. Experimental results show that resonant wavelength of the SHF-LPG has a blue shift with temperature with sensitivity of −0.11 nm/°C, a blue shift with increasing sensitivity with surrounding refractive index ranging from 1.335 to 1.44 (the maximum sensitivity is achieved when the surrounding refractive index reaches the effective index of the fiber cladding), and a red shift with bend-direction-dependent sensitivity up to 9.36 nm/m−1.

Sensing Characteristics of Long-Period Grating Inscribed in Grapefruit Photonic Crystal Fiber by Femtosecond Laser

2014 ◽  
Vol 513-517 ◽  
pp. 4231-4234
Author(s):  
Yuan Wei ◽  
Yu Jie Du
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Photonic Crystal Fiber ◽  
Resonant Wavelength ◽  
Long Period Grating ◽  
Crystal Fiber ◽  
Long Period ◽  
Surrounding Refractive Index ◽  
Novel Method

A novel method for fabricating long period grating in grapefruit photonic crystal fiber (GPCF) is proposed and demonstrated. An 800nm femtosecond laser is adopted to scan a section of GPCF periodically point-by-point, resulting in effective refractive index periodic demodulation. High resonance of ~17dB is obtained with a grating length of 30 mm. The temperature sensitivity of resonant wavelength 0.03 nm/°C is obtained from 20°C to 120 °C. In addition, the relationship between resonant wavelength and surrounding refractive index (SRI), when LPFG immersed in refractive index of solution of different index, is also researched.

Matching long-period grating modes and localized plasmon resonances: effect on the sensitivity of the grating to the surrounding refractive index

2016 ◽  
Vol 55 (32) ◽  
pp. 8979 ◽  
Author(s):  
Bárbara Rutyna Heidemann ◽  
Júlia De Carvalho Pereira ◽  
Ismael Chiamenti ◽  
Marcela Mohallem Oliveira ◽  
Marcia Muller ◽  
...  
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Long Period ◽  
Plasmon Resonances ◽  
Surrounding Refractive Index ◽  
Localized Plasmon ◽  
Localized Plasmon Resonances

Study and investigation of long period grating as refractive index sensor

Optik ◽  
2014 ◽  
Vol 125 (7) ◽  
pp. 1860-1863 ◽  
Author(s):  
Amit Singh ◽  
Shashi B. Rana ◽  
Maninder Singh ◽  
Anish Sharma
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Long Period Grating ◽  
Long Period

Measurements of refractive index sensitivity using long-period grating refractometer

2004 ◽  
Vol 229 (1-6) ◽  
pp. 65-69 ◽  
Author(s):  
Joo Hin Chong ◽  
Ping Shum ◽  
H Haryono ◽  
A Yohana ◽  
M.K Rao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Long Period Grating ◽  
Refractive Index Sensitivity ◽  
Long Period ◽  
Index Sensitivity
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