Using lossy mode resonance for in-situ measuring the refractive index of a layer deposited on the optical fiber lateral surface

2021 ◽  
Author(s):  
Evgeny Savelyev ◽  
Dmitrij Sudas ◽  
Peter Kuznetsov
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Lateral Surface

scholarly journals Fabrication of a Bare Optical Fiber-Based Biosensor

Micromachines ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 522
Author(s):  
Yu-Jun Zhang ◽  
Jin-Cherng Hsu ◽  
Jia-Huey Tsao ◽  
Yung-Shin Sun
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Gold Film ◽  
Optical Fiber Sensor ◽  
Binding Kinetics ◽  
Fiber Sensor ◽  
Sensor Surface ◽  
Material Interface ◽  
Kinetics Of

A bare optical fiber-based biosensor is proposed for measuring the refractive index of different liquids and the binding kinetics of biomolecules to the sensor surface. This optical fiber sensor is based on the Kretschmann’s configuration to attain total internal reflection (TIR) for surface plasmon resonance (SPR) excitation. One end of the bare optical fiber is coated with a gold film. By guiding the light source from the other end into the optical fiber, the light is reflected from the gold-deposited end and the surface evanescent wave is excited in the gold film-transparent material interface. Methanol and ethanol solutions with different refractive indices are used for measuring the corresponding changes in the peak values of the spectra and calculating the corresponding sensitivities. These values are experimentally determined to be in the order of 10−4~10−5 refractive index unit (RIU). Binding of proteins onto the sensor surface is also monitored in real time to obtain the binding kinetics. We believe that, in the future, this optical fiber sensor can serve as a useful biosensor for in situ measurement of allergens, antibody–antigen interactions, and even circulating tumor cells in the blood.

In situ Near-IR Cure Monitoring of a Model Epoxy Matrix Composite

1996 ◽  
Vol 50 (7) ◽  
pp. 900-905 ◽  
Author(s):  
Sheryl Cossins ◽  
Mike Connell ◽  
Bill Cross ◽  
Robb Winter ◽  
Jon Kellar
Keyword(s):  
Refractive Index ◽  
Infrared Spectrum ◽  
Optical Fiber ◽  
Evanescent Wave ◽  
Near Infrared ◽  
Internal Reflection ◽  
Silica Optical Fiber ◽  
Lower Refractive Index ◽  
Near Infrared Spectrum

To improve the performance of composites it is imperative that the interphase region between the inorganic reinforcement and the polymer matrix be more completely understood. It is in this region that the stress transfer between the matrix and the reinforcement occurs. To this end, the curing of epoxy adjacent to an embedded silica optical fiber has been monitored in situ by evanescent wave spectroscopy. The epoxy studied is partially fluorinated and has a lower refractive index than the silica optical fiber. This combination of epoxy/silica served as a model composite system. The lower refractive index of the partially fluorinated epoxy allowed the silica optical fiber to be used as a waveguide for the internal reflection of near-infrared light. The epoxy curing was determined as a function of time and temperature by analysis of the near-infrared spectrum from the epoxy adjacent to the fiber obtained by the interaction of the evanescent wave that occurs at each internal reflection with the low-refractive-index epoxy. The results obtained from the examination of the near-infrared spectrum, particularly the disappearance of the NH2 stretching/bending combination band at ∼4925 cm−1 and the concomitant increase of the C–N overtone band at ∼4725 cm−1, showed that epoxy ring-opening and cross-linking reactions could be followed in real time. Finally, treatment of the fiber with a silane coupling agent had no observable effect on the curing reaction of the epoxy.

scholarly journals Refractive Index Sensor for Salty and Sugary Solution Based on Optical Fiber Technical

2021 ◽  
Vol 1879 (3) ◽  
pp. 032077
Author(s):  
Maher Khaleel Ibrahim ◽  
Shehab A Kadhim ◽  
Nabeil Ibrahim Fawaz
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Refractive Index Sensor

In-situ photoconductivity measurement of imidazole in optical fiber break-junctions

2021 ◽  
Author(s):  
Zhikai Zhao ◽  
Chenyang Guo ◽  
Lifa Ni ◽  
Xueyan Zhao ◽  
Surong Zhang ◽  
...  
Keyword(s):  
Electron Transport ◽  
Optical Fiber ◽  
Transport Properties ◽  
Molecular Junctions ◽  
Break Junction ◽  
Break Junctions ◽  
Fiber Break ◽  
Electron Transport Properties ◽  
Photoconductivity Measurement

We develop a method based on the mechanically controllable break junction technique to investigate the electron transport properties of single molecular junctions upon fiber waveguided light. In our strategy, a...

scholarly journals Development of a Temperature-Controlled Optical Planar Waveguide Sensor with Lossy Mode Resonance for Refractive Index Measurement

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 199
Author(s):  
Yu-Cheng Lin ◽  
Liang-Yü Chen
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Temperature Control ◽  
Planar Waveguide ◽  
Metallic Oxide ◽  
Refractive Index Measurement ◽  
Index Measurement ◽  
Temperature Controlled ◽  
Optical Planar Waveguide ◽  
Active Temperature

The generation of lossy mode resonances (LMR) with a metallic oxide film deposited on an optical fiber has attracted the attention of many applications. However, an LMR-based optical fiber sensor is frangible, and therefore it does not allow control of the temperature and is not suited to mass production. This paper aims to develop a temperature-controlled lossy mode resonance (TC-LMR) sensor on an optical planar waveguide with an active temperature control function in which an ITO film is not only used as the LMR resonance but also to provide the heating function to achieve the benefits of compact size and active temperature control. A simple flat model about the heat transfer mechanism is proposed to determine the heating time constant for the applied voltages. The TC-LMR sensor is evaluated experimentally for refractive index measurement using a glycerol solution. The heating temperature functions relative to the controlled voltages for water and glycerol are obtained to verify the performance of the TC-LMR sensor. The TC-LMR sensor is a valuable sensing device that can be used in clinical testing and point of care for programming heating with precise temperature control.

An optical fiber-based LSPR aptasensor for simple and rapid in-situ detection of ochratoxin A

2018 ◽  
Vol 102 ◽  
pp. 504-509 ◽  
Author(s):  
Bobin Lee ◽  
Jin-Ho Park ◽  
Ju-Young Byun ◽  
Joon Heon Kim ◽  
Min-Gon Kim
Keyword(s):  
Optical Fiber ◽  
Ochratoxin A ◽  
In Situ Detection
Sign in / Sign up

Export Citation Format

Share Document