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  • 1.
    Etcheverry, Sebastian
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. Acreo Swedish ICT AB, Sweden.
    Sudirman, Aziza
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. Acreo Swedish ICT AB, Sweden.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. Acreo Swedish ICT AB, Sweden.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Identification and collection of particles with optical fibers2015Inngår i: NOVEL BIOPHOTONICS TECHNIQUES AND APPLICATIONS III, 2015, Vol. 9540, artikkel-id 95400NKonferansepaper (Fagfellevurdert)
    Abstract [en]

    A micro-structured fiber-based system for identification and collection of fluorescent particles is demonstrated. An optical fiber probe with longitudinal holes in the cladding is used to retrieve fluorescent particles by exerting microfluidics forces. Laser induced fluorescent (LIF) is carried out by the fiber probe and an optical setup. When a particle with a previously chosen fluorescence wavelength is identified, a vacuum pump is activated collecting the particle into a hole. Green and red fluorescent polystyrene particles were detected and selectively retrieved.

  • 2. Fanjoux, Gil
    et al.
    Sudirman, Aziza
    Beugnot, Jean-Charles
    Furfaro, Luca
    Margulis, Walter
    Sylvestre, Thibaut
    Stimulated Raman–Kerr scattering in an integrated nonlinear optofluidic fiber arrangement2014Inngår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 39, nr 18, s. 5407-5410Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We describe a novel optofluidic fiber arrangement that allows for nonlinear effects enhancement between fluids and laser light while suppressing the generation of cavitation bubbles. By filling this optofluidic system with toluene and pumping it with a nanosecond microchip laser, we demonstrate the efficient generation of a broadband Raman frequency comb spanning from 532 to more than 1000 nm. It is further shown that the Raman frequency comb dramatically broadens toward broadband continuum light due to the stimulated Raman–Kerr scattering.

  • 3. Gerosa, R. M.
    et al.
    Sudirman, Aziza
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Menezes, L. D. S.
    De Matos, C. J. S.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    All-fiber high-flow microfluidic dye laser2013Inngår i: Optics InfoBase Conference Papers, 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An all-fiber dye laser is demonstrated. The dye solution is kept under flow, allowing for high repetition rate pumping. Threshold average pump power of 2.15 mW and conversion slope efficiency of ~8.5% are achieved.

  • 4. Gerosa, Rodrigo M.
    et al.
    Sudirman, Aziza
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. Acreo Swedish ICT, Sweden.
    Menezes, Leonardo de S.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. Acreo Swedish ICT, Sweden.
    de Matos, Christiano J. S.
    All-fiber high repetition rate microfluidic dye laser2015Inngår i: Optica, ISSN 2334-2536, Vol. 2, nr 2, s. 186-193Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Optofluidic dye lasers may play a significant role in future laser applications in numerous areas, combining wavelength flexibility with integration and ease of operation. Nevertheless, no all-fiber integrated dye lasers have been demonstrated so far. In this paper, we report on a series of optofluidic all-fiber Rhodamine optical sources operating at a repetition rate as high as 1 kHz. Dye bleaching is avoided by circulating the Rhodamine dye during optical excitation. The laser radiation is extracted via conventional fibers that are spliced to the dye-filled capillary active medium. A tuneable amplified spontaneous emission source, a multimode laser, and a few transverse-mode laser are demonstrated by adjusting the setup. Threshold pump energies as low as similar to 1 mu J and slope efficiencies of up to mu 9% were obtained, indicating the potential for realworld applications in areas such as spectroscopy and biomedicine.

  • 5.
    Margulis, Walter
    et al.
    Acreo AB.
    Rugeland, Patrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Zetterlund, Erik
    Acreo AB.
    Antoine, Loirette
    Sudirman, Aziza
    Sterner, Carola
    Acreo AB.
    Eriksson, Mats
    Acreo AB.
    Eriksson-Quist, Helena
    Acreo AB.
    Gemini fibers for sensing2010Konferansepaper (Fagfellevurdert)
  • 6.
    Sudirman, Azizahalhakim
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvantelektronik och -optik, QEO.
    Increased Functionality of Optical Fibers for Life-Science Applications2014Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The objective of this thesis work is to increase the functionality of optical fibers for possible applications in life-sciences. Optical fibers are a promising technology for use in biology and medicine. They are low-costwaveguides, flexible and have a small cross-section. They can guide high-power light with low loss in a micrometer core-size. These features make fibers attractive for minimally-invasive,in-vivostudies. The backwards guidance of the optical signal allows for real-time monitoring of the distance to the scattering targets and to study the environment through Raman scattering and fluorescence excitation. The longitudinal holes introduced in the fibers can be used,for instance,for delivery of medicine to a specific regionof a body. They could even be used for the extractionof species considered interesting for further analysis, for example, studyingcells that may be cancer-related.

    This thesis deals with four main topics. First, a demonstration is presented of the combination of high-power light guidance for ablation, low-power light reflectometry for positioning, and for liquid retrieval in a single fiber. It was found that in order to exploit the microfluidic possibilities available in optical fibers with holes, one needs to be able to combine fluids and light in a fiber without hindering the low-loss light guidance and the fluid flow. Secondly, one should also be able to couple light into the liquids and backout again. This is the subject of another paper in the present thesis. It was also observed that laser excitation through a fiber for the collection of a low-intensity fluorescence signal was often affected by the luminescence noise createdby the primary-coating of the fiber. This problem makes it difficult to measure low light-levels, for example, from single-cells. Athirdpaper in this thesis then describes a novel approach to reduce the luminescence from the polymer coating of the fiber, with the use of a nanometer-thick carbon layer on the cladding surface. Finally, exploiting some of the results described earlier, an optical fiber with longitudinal holes is used for the excitation, identification and for the collection of particles considered being of interest. The excitation light is guided in the fiber, the identification is performed by choosing the fluorescent particles with the appropriate wavelength, and, when a particle of interest is sufficiently near the fiber-tip, the suction system is activated for collection of the particle with good specificity.

    It is believed that the work described in this thesis could open the doors for applications in life-sciences and the future use of optical fibers for in-vivo studies.

  • 7.
    Sudirman, Azizahalhakim
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Kvantelektronik och -optik, QEO.
    Björk, Gunnar
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Fotonik och optik, Kvantelektronik och -optik, QEO.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Reflectometry, ablation and fluid retrieval with an optical fiber2010Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, nr 1, s. 134-140Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A technique combining low-coherence reflectometry, laser ablation and microfluidics in a single microstructured fiber is developed. Experimental results demonstrate the possibility to ablate thin aluminum foil samples with fiber-guided Nd:YAG laser light, to collect liquid in the holes of the fiber and to simultaneously monitor the positioning of fiber for ablation and the fluid collection process with low-coherence reflectometry. Potential applications of the technique include minimally invasive retrieval of liquid samples with low contamination risk.

  • 8.
    Sudirman, Azizahalhakim
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvantelektronik och -optik, QEO. Acreo Swedish ICT AB, Dept Fiber Opt, Sweden.
    Etcheverry, Sebastian
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik. Acreo Swedish ICT AB, Dept Fiber Opt, Sweden.
    Stjernström, Mårten
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvantelektronik och -optik, QEO.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik. Acreo Swedish ICT AB, Dept Fiber Opt, Sweden.
    A fiber optic system for detection and collection of micrometer-size particles2014Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, nr 18, s. 21480-21487Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An optical fiber containing longitudinal holes adjacent to the core has been used to detect and collect fluorescent particles from a solution. Excitation light was launched through the fiber and fluorescence signal was guided back to a detector system. As a proof of principle, green and red fluorescent polystyrene beads were detected and selectively collected from a water solution containing a mixture of red and green fluorescent beads.

  • 9.
    Sudirman, Azizahalhakim
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvantelektronik och -optik, QEO.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvantelektronik och -optik, QEO.
    All-Fiber Optofluidic Component to Combine Light and Fluid2014Inngår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 26, nr 10, s. 1031-1033Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A component is presented that combines light and fluid in an optical fiber arrangement for optofluidics. The component couples light from a standard telecom fiber (STF) to the solid-core of a microstructured fiber, and delivers fluid from a capillary to the holes of the same microstructured fiber. The light is then made to interact longitudinally with the delivered fluid in a hollow-core fiber or capillary. The component is all-spliced, hermetic and allows for fluid flow without interrupting the optical beam. Light is brought from the STF to the solid-core/fluid interface with a loss <0.1 dB.

  • 10.
    Sudirman, Azizahalhakim
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Fully spliced optofluidic fiber arrangement2013Inngår i: Optics InfoBase Conference Papers, 2013Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An all-fiber optofluidic arrangement is presented allowing for low-loss (>1 dB) light coupling from telecom fiber to a liquid-core fiber waveguide, simultaneous hermetic fluid delivery from a capillary to the liquid core, and fluid flow.

  • 11.
    Sudirman, Azizahalhakim
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvantelektronik och -optik, QEO.
    Norin, L.
    Margulis, Walter
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Increased sensitivity in fiber-based spectroscopy using carbon-coated fiber2012Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, nr 27, s. 28049-28055Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Carbon-coated optical fibers are used here for reducing the luminescence background created by the primary-coating and thus increase the sensitivity of fiber-based spectroscopy systems. The 2-3 orders of magnitude signal-to-noise ratio improvement with standard telecom fibers is sufficient to allow for their use as Raman probes in the identification of organic solvents.

  • 12.
    Sudirman, Azizahalhakim
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Kvantelektronik och -optik, QEO.
    Stjernström, Mårten
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Margulis, Walter
    Acreo AB.
    Single-fiber for minimally-invasive identification and collection of biological species2012Inngår i: 2012 Conference on Lasers and Electro-Optics, CLEO 2012, 2012, s. 6326385-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A technology based on laser-induced fluorescence combined with microstructured fiber for micrometer-size sample detection and collection is presented. The fiber-based system introduces the possibility for real-time monitoring in in-vivo measurements.

1 - 12 of 12
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