scholarly journals Highly sensitive optical response of optical fiber long period gratings to nanometer-thick ionic self-assembled multilayers

2005 ◽  
Vol 86 (22) ◽  
pp. 223104 ◽  
Author(s):  
Zhiyong Wang ◽  
J. R. Heflin ◽  
Rogers H. Stolen ◽  
Siddharth Ramachandran
Keyword(s):  
Optical Fiber ◽  
Optical Response ◽  
Long Period ◽  
Long Period Gratings ◽  
Highly Sensitive ◽  
Self Assembled

scholarly journals Long-Period Gratings and Microcavity In-Line Mach Zehnder Interferometers as Highly Sensitive Optical Fiber Platforms for Bacteria Sensing

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3772 ◽  
Author(s):  
Tinko Eftimov ◽  
Monika Janik ◽  
Marcin Koba ◽  
Mateusz Śmietana ◽  
Predrag Mikulic ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Outer Membrane Proteins ◽  
Label Free ◽  
Fiber Sensors ◽  
E Coli ◽  
Long Period ◽  
Long Period Gratings ◽  
Highly Sensitive ◽  
Micro Cavity ◽  
And Staphylococcus Aureus

Selected optical fiber sensors offer extraordinary sensitivity to changes in external refractive (RI), which make them promising for label-free biosensing. In this work the most sensitive ones, namely long-period gratings working at (DTP-LPG) and micro-cavity in-line Mach-Zehnder interferometers (µIMZI) are discussed for application in bacteria sensing. We describe their working principles and RI sensitivity when operating in water environments, which is as high as 20,000 nm/RIU (Refractive index unit) for DTP-LPGs and 27,000 nm/RIU for µIMZIs. Special attention is paid to the methods to enhance the sensitivity by etching and nano-coatings. While the DTP-LPGs offer a greater interaction length and sensitivity to changes taking place at their surface, the µIMZIs are best suited for investigations of sub-nanoliter and picoliter volumes. The capabilities of both the platforms for bacteria sensing are presented and compared for strains of Escherichia coli, lipopolysaccharide E. coli, outer membrane proteins of E. coli, and Staphylococcus aureus. While DTP-LPGs have been more explored for bacteria detection in 102–106 Colony Forming Unit (CFU)/mL for S. aureus and 103–109 CFU/mL for E. coli, the µIMZIs reached 102–108 CFU/mL for E. coli and have a potential for becoming picoliter bacteria sensors.

scholarly journals Improved Refractive Index Sensitivity Utilizing Long-Period Gratings with Periodic Corrugations on Cladding

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Anthony Lim ◽  
Wen Bin Ji ◽  
Swee Chuan Tjin
Keyword(s):  
Refractive Index ◽  
Cost Effective ◽  
Experimental Results ◽  
Refractive Index Sensitivity ◽  
Long Period ◽  
Specimen Collection ◽  
Long Period Gratings ◽  
Highly Sensitive ◽  
Index Sensitivity

A new structure of Long-Period Gratings (LPGs) sensor is introduced as a sensitive ambient RI sensor. This structure consists of creating periodic corrugations on the cladding of the LPG. The experimental results show that this LPG structure has good performances in terms of linearity and sensitivity and serves as a highly sensitive and cost-effective sensor. It also has the advantage of portability as the corrugation can also serve as the reservoir for the specimen collection to be tested.

scholarly journals Immunosensor Based on Long-Period Fiber Gratings for Detection of Viruses Causing Gastroenteritis

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 813 ◽  
Author(s):  
Marta Janczuk-Richter ◽  
Beata Gromadzka ◽  
Łukasz Richter ◽  
Mirosława Panasiuk ◽  
Karolina Zimmer ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Medical Diagnostics ◽  
Label Free ◽  
Fiber Gratings ◽  
Fast Detection ◽  
Long Period ◽  
Highly Sensitive ◽  
Protein Receptors ◽  
Long Period Fiber Gratings ◽  
Vaccine Testing

Since the norovirus is the main cause of acute gastroenteritis all over the world, its fast detection is crucial in medical diagnostics. In this work, a rapid, sensitive, and selective optical fiber biosensor for the detection of norovirus virus-like particles (VLPs) is reported. The sensor is based on highly sensitive long-period fiber gratings (LPFGs) coated with antibodies against the main coat protein of the norovirus. Several modification methods were verified to obtain reliable immobilization of protein receptors on the LPFG surface. We were able to detect 1 ng/mL norovirus VLPs in a 40-min assay in a label-free manner. Thanks to the application of an optical fiber as the sensor, there is a possibility to increase the user’s safety by separating the measurement point from the signal processing setup. Moreover, our sensor is small and light, and the proposed assay is straightforward. The designed LPFG-based biosensor could be applied in both fast norovirus detection and in vaccine testing.

Microtapered long period gratings: Non-destructive fabrication, highly sensitive torsion sensing, and tunable broadband filtering

2019 ◽  
Vol 102 ◽  
pp. 103000 ◽  
Author(s):  
Jihong Liu ◽  
Minhui Cheng ◽  
Xudong Kong ◽  
Dongdong Han ◽  
Jun Dong ◽  
...  
Keyword(s):  
Long Period ◽  
Long Period Gratings ◽  
Highly Sensitive ◽  
Non Destructive

scholarly journals Soil moisture content measurement using optical fiber long period gratings

2017 ◽  
Author(s):  
J. S. Hallett ◽  
M. Partridge ◽  
S. W. James ◽  
D. Tiwari ◽  
T. Farewell ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Optical Fiber ◽  
Soil Moisture Content ◽  
Long Period ◽  
Content Measurement ◽  
Long Period Gratings ◽  
Moisture Content Measurement
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