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.

Refractive index and temperature sensing characteristics of an optical fiber sensor based on a tapered single mode fiber/polarization maintaining fiber

2016 ◽  
Vol 14 (5) ◽  
pp. 050604-50608
Author(s):  
Zaihang Yang Zaihang Yang ◽  
Hao Sun Hao Sun ◽  
Tingting Gang Tingting Gang ◽  
Nan Liu Nan Liu ◽  
Jiacheng Li Jiacheng Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Temperature Sensing ◽  
Fiber Sensor ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Sensing Characteristics

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 A High-Birefringence Microfiber Sagnac-Interferometer Biosensor Based on the Vernier Effect

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4114 ◽  
Author(s):  
Xue-Zhou Wang ◽  
Qi Wang
Keyword(s):  
Refractive Index ◽  
Sagnac Interferometer ◽  
Refractive Index Sensitivity ◽  
Electrostatic Adsorption ◽  
High Birefringence ◽  
Polarization Maintaining Fiber ◽  
Good Biocompatibility ◽  
Polarization Maintaining ◽  
Index Sensitivity ◽  
Index Unit

We propose a high-sensitive Sagnac-interferometer biosensor based on theVernier effect (VE) with a high-birefringence microfiber. The sensitivity enhancement is achieved by utilizing two cascaded Sagnac interferometers. One of the two interference loops consists of a panda polarization-maintaining fiber as a filter, whilst the other is comprised of high-birefringent microfiber coated Graphene oxide (GO) as a sensing channel. We theoretically analyzed the sensitivity of the sensor and verified it with experiments. The results of the simulation show that the refractive index sensitivity is more than five times that of the fiber sensor based on a single Sagnac loop. The sensitivity of the refractive index in the experiments can reach 2429 nm/refractive index unit (RIU), which is basically in accordance with the simulation. We also use electrostatic adsorption to coat GO on the surface of the sensing channel. GO is employed to adsorb bovine serum albumin (BSA) molecules to achieve the desired detection results, which has good biocompatibility and large specific surface area. The sensitivity to detect BSA can reach 9.097 nm/(mg×mL−1).

scholarly journals Tunable Fano Resonances in an Ultra-Small Gap

2020 ◽  
Vol 10 (7) ◽  
pp. 2603
Author(s):  
Fuqiang Yao ◽  
Fang Li ◽  
Zhicong He ◽  
Yahui Liu ◽  
Litu Xu ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Performance ◽  
Figure Of Merit ◽  
Silver Film ◽  
Destructive Interference ◽  
Refractive Index Sensitivity ◽  
Thin Aluminum ◽  
Index Sensitivity ◽  
Index Unit ◽  
Dielectric Environment

A Fano resonance is experimentally observed in a single silver nanocube separated from a supporting silver film by a thin aluminum oxide film. The resonance spectrum is modulated by changing the size of the silver nanocube and its distance from the silver film. The system is fabricated by a bottom-up process with an accurately controlled nanogap at the sub-6-nm scale. The simulation result shows that the destructive interference between the dipole mode and the quadrupole mode in this “nanocube on mirror” (NCoM) structure is responsible for the resonance. The spectra red-shifted as the size of the silver nanocube increased and its distance from the silver film decreased. In addition, a refractive index sensitivity of the spectrum of 140 meV/RIU (refractive index unit), with a 2.4 figure of merit, is obtained by changing the dielectric environment around the silver nanocube. This work will enable the development of high-performance tunable optical nanodevices based on NCoM structures.

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

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
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