News Letter on Optical Fiber Research: April -2019

Polymer optical fiber-based sensing element for synchronal measuring of breath and pulse rate underneath dynamic movements

In this paper, we have a tendency to gift the event of a chemical compound glass fiber (POF) device for synchronic activity of breath (BR) and heart rates (HR). The device is embedded as a wise textile resolution that may be used inside the user’s garments. additionally, a symbol process technique is planned for getting the time unit and BR while not the influence of body movements and in numerous positions of the user’s chest. device signal process and analysis are created within the frequency domain and totally different filters are applied. Results show errors below four beats per minute and a couple of breaths per minute for the time unit and BR, severally, even once the user is performing arts periodic body movements like those evoked by the gait. Thus, the planned POF-based sensible textile could be a cheap  resolution with smart accuracy that may be without delay applied within the remote observation of patients reception while not distressful their daily activities. [1]

Microstructured Optical Fiber-Based Plasmonic Sensors

Surface plasmon resonance (SPR) could be a significantly growing optical sensing approach that has been utilized in big selection of applications together with medical nosology, biological and chemical analyte detection, environmental watching, and food safety to security. SPR sensing technique shows high sensitive nature thanks to chickenfeed of sample index of refraction, compared to different optical sensing techniques. Recently, microstructured optical fiber-based plasmonic sensors have shown nice development thanks to its compact structure and lightweight dominant capabilities in unprecedented  ways that. The goal of this chapter is to (1) describe the principle operation of plasmonic sensors, (2) discuss the optical properties of plasmonic materials, (3) compare and distinction the various varieties of microstructured optical fiber-based plasmonic sensors, and (4) highlight the most challenges of microstructured plasmonic sensors and potential solutions. [2]

Highly Reproducible, Isotropic Optofluidic Laser Based on Hollow Optical Fiber

We report a duplicatable optofluidic optical maser (OFL) for multichannel organic chemistry sensing. A hollow fiber (HOF) is each microring resonator for lasing and microfluidic channel. The lasing mechanism is analyzed in spectral domain. due to the precise management of the fiber pure mathematics and also the motility symmetry, the HOF-OFL emission is uniformly distributed within the angular direction ( σ = zero.6%) and might use handily for disposable or clad use. associate array of 10 OFLs is incontestible with smart reliableness ( σ = 3.9%) in optical maser threshold. The clad sensing capability of the OFL is additionally investigated. The HOF-OFLs are extremely duplicatable, simple to integrate in chip-scale, and have nice potential for organic chemistry detection. [3]

Construction of implantable optical fibers for long-term optogenetic manipulation of neural circuits

In vivo optogenetic methods have redefined our ability to assay however neural circuits govern behavior. though acutely established  optical fibers have antecedently been employed in such studies, long management over somatic cell activity has been for the most part undoable. Here we have a tendency to describe a way to construct implantable optical fibers to pronto manipulate neural circuit parts with least tissue harm or modification in lightweight output over time (weeks to months). established  optical fibers pronto interface with in vivo electrophysiological arrays or chemical science detection electrodes. The procedure represented here, from implant construction to the beginning of behavioural experimentation, are often completed in close to 2–6 weeks. winning use of implantable optical fibers can provide long management of class neural circuits in vivo, that is integral to the study of the biological science of behavior. [4]

A Simple Relative Humidity Sensor Employing Optical Fiber Coated with Lithium Chloride

A simple fiber ratio detector was invented employing a metallic element chloride film coated on the distal finish of sensing fiber. The detector, metallic element chloride film whose index of refraction is sensitive to wet, thereby changes the mirrored strength of the sensing finish. By observance the amendment of mirrored strength beneath totally different RH levels, the data regarding RH of the atmosphere may be obtained. A distinction of up to zero.64uW of the mirrored optical power is discovered once RH changes from eleven to seventy five. The LiCl-based detector incorporates a sensitivity of regarding zero.01uW/%RH with a slope dimensionality of over ninety nine.8%. The experimental setup is straightforward and simple to handle. The results demonstrate that LiCl-based fiber detector is sensitive, economical, flexible, and quick response, has the potential of remote on-line observance wetness. [5]

 

Reference

[1] Leal-Junior, A.G., Díaz, C.R., Leitão, C., Pontes, M.J., Marques, C. and Frizera, A., 2019. Polymer optical fiber-based sensor for simultaneous measurement of breath and heart rate under dynamic movements. Optics & Laser Technology, 109, pp.429-436. (Web Link)

[2] Rifat, A.A., Hasan, M.R., Ahmed, R. and Miroshnichenko, A.E., 2019. Microstructured optical fiber-based plasmonic sensors. In Computational Photonic Sensors (pp. 203-232). Springer, Cham. (Web Link)

[3] Xu, Y., Gong, C., Chen, Q., Luo, Y., Wu, Y., Wang, Y., Peng, G.D., Rao, Y.J., Fan, X. and Gong, Y., 2019. Highly Reproducible, Isotropic Optofluidic Laser Based on Hollow Optical Fiber. IEEE Journal of Selected Topics in Quantum Electronics, 25(1), pp.1-6. (Web Link)

[4] Construction of implantable optical fibers for long-term optogenetic manipulation of neural circuits

Dennis R Sparta, Alice M Stamatakis, Jana L Phillips, Nanna Hovelsø, Ruud van Zessen & Garret D Stuber
Nature Protocols volume 7, pages 12–23 (2012) (Web Link)

[5] A Simple Relative Humidity Sensor Employing Optical Fiber Coated with Lithium Chloride

Bao- Kai Zhang
Laboratory of Nanophotonic Functional Materials and Devices, School for Information and Optoelectronic Science and Engineering, South China Normal University, 510006 Guangzhou, China

Chun- Hua Tan
Laboratory of Nanophotonic Functional Materials and Devices, School for Information and Optoelectronic Science and Engineering, South China Normal University, 510006 Guangzhou, China (Web Link)

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