Refractive index sensitivity of optical fiber lossy-mode resonance sensors based on atomic layer deposited TiOxthin overlay

2016 ◽  
Author(s):  
Dariusz Burnat ◽  
Marcin Koba ◽  
Łukasz Wachnicki ◽  
Sylwia Gierałtowska ◽  
Marek Godlewski ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Atomic Layer ◽  
Refractive Index Sensitivity ◽  
Index Sensitivity

High Performance Molecular Detection Biosensor Using Plasmonic Spiral Nanoantenna Based on Optical Fiber

2020 ◽  
Vol 16 (5) ◽  
pp. 715-720
Author(s):  
Ali Elrashidi
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Cholesterol Oxidase ◽  
Surrounding Medium ◽  
Optical Power ◽  
Optical Signal ◽  
Peak Wavelength ◽  
Refractive Index Sensitivity ◽  
Reflected Signal ◽  
Index Sensitivity

Biomedical sensor that sense different molecules with a high refractive index sensitivity is proposed in this work. Plasmonic nanospiral antenna is mounted on a top surface of an optical fiber to reflect the incident optical signal back to the fiber. The reflected signal depends on the nanospiral antenna material, dimensions and the surrounding medium. Using streptavidin molecule, the nanospiral antenna have been simulated based on finite difference time domain method to optimize its dimensions. The optimum dimensions are 10 nm, 55 nm and 40 nm for inner-outer thicknesses and height respectively. The introduced biosensor can detect different molecules based on surface plasmonic resonance, which depends on the shifting of the peak wavelength according to the molecules type. The detected molecules are Streptavidin, Urease, Uricase molecules and Glucose oxidase and Cholesterol oxidase enzymes with a high sensitivity. The maximum refractive index sensitivity is obtained when sensing cholesterol oxidase molecules with 3028 nm/RIU at 3.58 μm peak wavelength. Figure of merit and quality factor are also calculated for all detected molecules. Finally, electric field and optical power, before and after binding, of the reflected signal are illustrated and discussed.

scholarly journals Refractive index sensitivity enhancement of optical fiber cladding mode by depositing nanofilm via ALD technology

2013 ◽  
Vol 21 (22) ◽  
pp. 26136 ◽  
Author(s):  
Ying Zhao ◽  
Fufei Pang ◽  
Yanhua Dong ◽  
Jianxiang Wen ◽  
Zhenyi Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Sensitivity Enhancement ◽  
Refractive Index Sensitivity ◽  
Cladding Mode ◽  
Index Sensitivity ◽  
Optical Fiber Cladding

scholarly journals Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3285 ◽  
Author(s):  
Rex Tan ◽  
Daryl Ho ◽  
Chun Tse ◽  
Yung Tan ◽  
Seong Yoo ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Ambient Temperature ◽  
Fiber Bragg Gratings ◽  
Temperature Fluctuations ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Refractive Index Sensitivity ◽  
Index Sensitivity ◽  
Index Unit

We demonstrate a simple-to-fabricate refractometer based on the inscription of fiber Bragg gratings in a special C-shaped optical fiber. The C-shaped fiber was drawn into shape using a quarter cladding removed preform of a commercial standard single-mode fiber by simple machining. The sensor did not suffer from cross-sensitivity of the refractive index with ambient temperature fluctuations, commonly occurring with many optical fiber refractometers. A refractive index sensitivity of 1300 pm per refractive index unit (RIU) was achieved without employing any additional sensitization techniques such as tapering or etching.

The effect of ALD-grown Al2O3on the refractive index sensitivity of CVD gold-coated optical fiber sensors

2015 ◽  
Vol 26 (43) ◽  
pp. 434002 ◽  
Author(s):  
David J Mandia ◽  
Wenjun Zhou ◽  
Matthew J Ward ◽  
Howie Joress ◽  
Jeffrey J Sims ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fiber Sensors ◽  
Refractive Index Sensitivity ◽  
Fiber Sensors ◽  
Index Sensitivity

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.

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