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Sökning: swepub > Laurell Fredrik

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1.
  • Jalilian, Ehsan, et al. (författare)
  • Luminescence properties of the Cu4I62- cluster
  • 2011
  • Ingår i: CrystEngComm. - : Royal Society of Chemistry (RSC). - 1466-8033 .- 1466-8033. ; 13:14, s. 4729-4734
  • Tidskriftsartikel (refereegranskat)abstract
    • Two new solvates were prepared in the system Cu(I) I using a solvolysis reaction. The structures for both of them were solved by X-ray crystallography, showing that they constitute two modifications of the same compound with the net formula [Cu4I6](P(C6H5)(4))(2)center dot 2OC(CH3)(2). Both types of crystals show vivid fluorescence when exposed to UV light. The formation of the first modification (I) seems to be preferred by kinetics and on ageing in the mother liquor it converts to modification (II). The Cu positions in (I) are disordered while those in (II) are fully ordered. The luminescent properties of both crystals were characterized using a confocal microscope and an excitation wavelength of 405 nm, resulting in fluorescence spectra with the intensities of 1.22 and 0.52 relative to the reference (fluorescein 10 mu M). Density functional theory calculations on the ordered Cu4I62- core of modification (II) show that the de-excitation from LUMO to HOMO is responsible for the luminescence. The calculated emission spectrum has a maximum at 531 nm in good agreement with the results from confocal microscopy.
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2.
  • Tjörnhammar, Staffan, 1980-, et al. (författare)
  • Multiwavelength laser designed for single-frame digital holography
  • 2016
  • Ingår i: Applied Optics. - : Optical Society of America. - 1559-128X .- 2155-3165 .- 0003-6935 .- 1539-4522. ; 55:27, s. 7517-7521
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, we present a tailored multiwavelength Yb-fiber laser source in the 1.03 μm spectral region for spatially multiplexed digital holographic acquisitions. The wavelengths with bandwidths below 0.1 nm were spectrally separated by approximately 1 nm by employing fiber Bragg gratings for spectral control. As a proof of concept, the shape of a cylindrically shaped object with a diameter of 48 mm was measured. The holographic acquisition was performed in single-shot dual-wavelength mode with a synthetic wavelength of 1.1 mm, and the accuracy was estimated to be 3% of the synthetic wavelength.
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3.
  • Harish, Achar Vasant, et al. (författare)
  • Optofluidic Fiber Component to Separate Micron-Sized Particles using Elasto-Inertial Focusing
  • 2020
  • Ingår i: Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS. - : Institute of Electrical and Electronics Engineers Inc..
  • Konferensbidrag (refereegranskat)abstract
    • Using various fiber capillaries with different diameters and multiple holes we develop an optofluidic component capable of separating micron-sized beads emulating cells and bacteria, exploiting particle focusing in a viscoelastic fluid and analyzed optically. 
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4.
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5.
  • Pereira, Joao, et al. (författare)
  • Poling optical fibers with UV lamp
  • 2019
  • Ingår i: Conference on Lasers and Electro-Optics OSA Technical Digest (Optical Society of America, 2019), paper SM2L.5. - : OSA - The Optical Society. - 9781557528209
  • Konferensbidrag (refereegranskat)abstract
    • Silicate fibers with internal electrodes are optically poled without a laser by side-exposure to radiation from a UV tubular lamp. Electrooptic coefficients χ(2) ~ 0.04 pm/V and Vπ = 810 V are obtained.
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6.
  • Kumar, Tharagan, et al. (författare)
  • Lab-in-a-fiber-based integrated particle separation and counting
  • 2023
  • Ingår i: Lab on a Chip. - : Royal Society of Chemistry. - 1473-0197 .- 1473-0189. ; 23, s. 2286-
  • Tidskriftsartikel (refereegranskat)abstract
    • An all-fiber integrated device capable of separating and counting particles is presented. A sequence of silica fiber capillaries with various diameters and longitudinal cavities are used to fabricate the component for size-based elasto-inertial passive separation of particles followed by detection in an uninterrupted continuous flow. Experimentally, fluorescent particles of 1 μm and 10 μm sizes are mixed in a visco-elastic fluid and fed into the all-fiber separation component. The particles are sheathed by an elasticity enhancer (PEO - polyethylene oxide) to the side walls. Larger 10 μm particles migrate to the center of the silica capillary due to the combined inertial lift force and elastic force, while the smaller 1 μm particles are unaffected, and exit from a side capillary. A separation efficiency of 100% for the 10 μm and 97% for the 1 μm particles is achieved at a total flow rate of 50 μL min−1. To the best of our knowledge, this is the first time effective inertial-based separation has been demonstrated in circular cross-section microchannels. In the following step, the separated 10 μm particles are routed through another all-fiber component for counting and a counting throughput of ∼1400 particles per min is demonstrated. We anticipate the ability to combine high throughput separation and precise 3D control of particle position for ease of counting will aid in the development of advanced microflow cytometers capable of particle separation and quantification for various biomedical applications. 
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7.
  • Parker, Helen E., et al. (författare)
  • A Lab-in-a-Fiber optofluidic device using droplet microfluidics and laser-induced fluorescence for virus detection
  • 2022
  • Ingår i: Scientific Reports. - : Nature Research. - 2045-2322. ; 12:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Microfluidics has emerged rapidly over the past 20 years and has been investigated for a variety of applications from life sciences to environmental monitoring. Although continuous-flow microfluidics is ubiquitous, segmented-flow or droplet microfluidics offers several attractive features. Droplets can be independently manipulated and analyzed with very high throughput. Typically, microfluidics is carried out within planar networks of microchannels, namely, microfluidic chips. We propose that fibers offer an interesting alternative format with key advantages for enhanced optical coupling. Herein, we demonstrate the generation of monodisperse droplets within a uniaxial optofluidic Lab-in-a-Fiber scheme. We combine droplet microfluidics with laser-induced fluorescence (LIF) detection achieved through the development of an optical side-coupling fiber, which we term a periscope fiber. This arrangement provides stable and compact alignment. Laser-induced fluorescence offers high sensitivity and low detection limits with a rapid response time making it an attractive detection method for in situ real-time measurements. We use the well-established fluorophore, fluorescein, to characterize the Lab-in-a-Fiber device and determine the generation of ∼ 0.9 nL droplets. We present characterization data of a range of fluorescein concentrations, establishing a limit of detection (LOD) of 10 nM fluorescein. Finally, we show that the device operates within a realistic and relevant fluorescence regime by detecting reverse-transcription loop-mediated isothermal amplification (RT-LAMP) products in the context of COVID-19 diagnostics. The device represents a step towards the development of a point-of-care droplet digital RT-LAMP platform. © 2022, The Author(s).
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8.
  • Etcheverry, Sebastián, et al. (författare)
  • Optofludics in microstructured fibers combining particle elasto-inertial focusing and fluorescence
  • 2016
  • Ingår i: 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO). - Washington, D.C. : IEEE conference proceedings. - 9781943580118
  • Konferensbidrag (refereegranskat)abstract
    • Optofluidics is exploited in an all-fiber component to detect and identify through fluorescence particles flowing at high rate and inertially focused in a capillary. The system represents a first step towards an in-fiber flow cytometer.
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9.
  • Etcheverry, Sebastián, et al. (författare)
  • Trapping and optical identification of microparticles in a liquid with a functional optical fiber probe
  • 2018
  • Ingår i: Conference on Lasers and Electro-Optics OSA Technical Digest (online) (Optical Society of America, 2018), paper AM4P.6. - : Optical Society of America. - 9781557528209
  • Konferensbidrag (refereegranskat)abstract
    • A fiber probe traps single micrometer-particles by fluid suction into a hollow microstructure and enables optical identification by the fluorescence light collected in a fiber core. The probe finds applications in life-science and environmental monitoring.
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10.
  • Harish, Achar Vasant, et al. (författare)
  • Fiber Based Optofluidic Micro-Flow Cytometer Collecting Side-Scattered Light
  • 2020
  • Ingår i: Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS. - : Institute of Electrical and Electronics Engineers (IEEE).
  • Konferensbidrag (refereegranskat)abstract
    • A compact fiber capillary based microflow cytometer capable of detecting side-scattered-light is demonstrated by using a 45° angle-cleaved metal coated optical fiber tip.
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