Approaches to mitigate polymer-core loss in plastic optical fibers: a review

Ioannides, Nicholas; Chunga, E. B.; Bachmatiuk, Alicja; González-Martínez, Ignacio; Trzebicka, Barbara; Adebimpe, D. B.; Kalymnios, D.; Rümmeli, Mark H.

doi:10.1088/2053-1591/1/3/032002

Cited by 31 publications

(20 citation statements)

References 34 publications

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“…The absorption coefficients for both of them are much lower than normal soda lime glass, namely 0.07 and 0.03 cm −1 , for the low‐iron soda lime glass and the borosilicate glass, respectively. In addition, the measured absorption coefficient at 850 nm of our OSTE (≈0.04 cm −1 ) is comparable to the most used PMMA (0.03 cm −1 ), [ 19 ] which implies that OSTE could also be a suitable host polymer matrix for fluorophores in LSCs in the aspect of low matrix absorption. To further decrease the matrix absorption, N‐BK7 glass and fluorinated PMMA can be used (the absorption coefficient of them are reported to be below 0.001 cm −1 ); [16b] however, their high cost greatly limits their application for large areas.…”

Section: Resultsmentioning

confidence: 58%

Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

et al. 2020

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Luminescent solar concentrator (LSC) is a promising technology to integrate semitransparent photovoltaic (PV) systems into modern buildings and vehicles. Silicon quantum dots (QDs) are good candidates as fluorophores in LSCs, due to the absence of overlap between absorption and emission spectra, high photoluminescence quantum yield (PLQY), good stability, nontoxicity, and element abundance. Herein, LSCs based on Si QDs/polymer nanocomposites are fabricated in a triplex glass configuration. A special polymer matrix (off‐stoichiometric thiol‐ene, OSTE) is used, which improves Si nanocrystal quantum yield. Herein, a comprehensive investigation to improve the performance of LSCs by exploring different strategies under the guidance of a theoretical description is conducted. Among these strategies, the systematical enhancement of PLQY of the nanocomposite is achieved by tuning the thiol/allyl group ratio in the OSTE matrix. In addition, ligand selection and loading optimization for QDs reduce the total scattering loss in the device. Finally, an optical power efficiency of 7.9% is achieved for an optimized LSC prototype (9 × 9 × 0.6 cm3, transmittance ≈62% at 500 nm) based on Si QDs/OSTE nanocomposite, which shows good potential of this material system in LSC fabrication.

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Section: Resultsmentioning

confidence: 58%

Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

et al. 2020

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“… 1015 For instance, at 730 nm at least 50% of the light is expected to be lost passing through a 1 m fiber. Thus, in case of NIR indicators, only short (1–2 m) plastic fibers are useful unless deuterated or fluorinated modifications of the polymers (which show much lower attenuation in NIR but have limited commercial availability) 1016 are used. Concerning mechanical stability, glass fibers are flexible enough at the core diameters of 140 to 400 μm but thicker fibers (e.g., 1 mm in diameter) are inconvenient to use because of the high rigidity and poor stability to bending.…”

Section: Sensing Formatsmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

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“…An optical waveguide, especially one designed for peripheral nervous system, should be flexible in all directions so as to minimize tissue reactivity. Polymer fibers are typically made of polycarbonate, PMMA, polystyrene, and Cytop (fluorinated polymer) but only Cytop has good transmission between 400 and 550 nm . Regardless, termination to a hermetically packaged laser diode remains a major challenge.…”

Section: Materials Considerations For Engineeringmentioning

confidence: 99%

A Materials Roadmap to Functional Neural Interface Design

Wellman

Eles

Ludwig

et al. 2017

Adv Funct Materials

301

328

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Advancement in neurotechnologies for electrophysiology, neurochemical sensing, neuromodulation, and optogenetics are revolutionizing scientific understanding of the brain while enabling treatments, cures, and preventative measures for a variety of neurological disorders. The grand challenge in neural interface engineering is to seamlessly integrate the interface between neurobiology and engineered technology, to record from and modulate neurons over chronic timescales. However, the biological inflammatory response to implants, neural degeneration, and long-term material stability diminish the quality of interface overtime. Recent advances in functional materials have been aimed at engineering solutions for chronic neural interfaces. Yet, the development and deployment of neural interfaces designed from novel materials have introduced new challenges that have largely avoided being addressed. Many engineering efforts that solely focus on optimizing individual probe design parameters, such as softness or flexibility, downplay critical multi-dimensional interactions between different physical properties of the device that contribute to overall performance and biocompatibility. Moreover, the use of these new materials present substantial new difficulties that must be addressed before regulatory approval for use in human patients will be achievable. In this review, the interdependence of different electrode components are highlighted to demonstrate the current materials-based challenges facing the field of neural interface engineering.

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Approaches to mitigate polymer-core loss in plastic optical fibers: a review

Cited by 31 publications

References 34 publications

Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

A Materials Roadmap to Functional Neural Interface Design

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