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Now showing items 1 - 16 of 22


    A focusing arrangement (100) for focusing particles or cells in a flow. The arrangement comprising at least one channel (110) for guiding the flow, the channel comprising at least one particle confinement structure comprising particle flow boundaries (112) and at least one acoustic confinement structure (120) comprising acoustic field boundaries (122) adapted for confining acoustic fields, wherein the acoustic field boundaries (122) are different from the particle flow boundaries (112) and wherein the at least one acoustic confinement structure (120) is arranged with regard to the channel (110) to confine acoustic fields at least partially, in the channel (110).
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    A lens free imaging device (100) for imaging a sample. The device (100) comprises a radiation guiding structure (110) in a chip (100) and an imaging region (120). The radiation guiding structure (110) is adapted for receiving an incoming radiation wave (101) thus obtaining a confined radiation wave (112) in the radiation guiding structure and for generating therefrom a first radiation wave (114) and a second radiation wave (116). The first wave (114) is directed out of the chip (100) to a sample measurement region for allowing interaction with the sample (130) and the second wave (116) is directed towards the imaging region (120). A scattered first radiation wave (118), scattered by the sample (130), is at least partly captured in the imaging region (130) and can be combined with the second radiation wave (114) captured in the imaging region (120) for forming an image.
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    The invention relates to a multi-channel spectrometer device (10) for detecting/quantifying a predetermined analyte (5) in a medium (6). The device (10) comprises an input (11) for receiving radiation (7), a first plurality of optical modulators (12) adapted for transforming the radiation (7) in accordance with a first transfer function, and a second plurality of optical modulators (13) adapted for transforming the radiation (7) in accordance with a second transfer function. The spectrometer device also comprises a detector (15) for generating output signals (4) indicative for the intensity of each transformed radiation signal. The ratio of the number of optical modulators in the first plurality and the number of optical modulators in the second plurality is determined by the ratio of a reference spectrum of the predetermined analyte transformed by the first transfer function and the reference spectrum transformed by the second transfer function.
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    The present invention relates to a device (1) for measuring an optical absorption property of a fluid as function of wavelength. The device comprises a broadband light source (2) for emitting light, a plurality of integrated optical waveguides (3) for guiding this light, and a light coupler (10) for coupling the emitted light into the integrated optical waveguides (3) such that the light coupled into each integrated optical waveguide (3) has substantially the same spectral distribution. The device also comprises a microfluidic channel (5) for containing the fluid, arranged such as to allow an interaction of the light propagating through each waveguide (3) with the fluid in the microfluidic channel (5). Each integrated optical waveguide (3) comprises an optical resonator (15) for filtering the light guided by the waveguide (3) according to a predetermined spectral component. The spectral component corresponding to each waveguide (3) is substantially different from the spectral component corresponding to another of the waveguides (3).
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    A lens-free device (100) for imaging one or more objects (106), the lens-free device comprising: a light source (102) positioned for illuminating at least one object (106); a detector (103) positioned for recording interference patterns of the illuminated at least one object (106); wherein the light source (102) comprises a plurality of light emitters (104) that are positioned and configured to create a controlled light wavefront (105) for performing lens-free imaging.
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    The invention relates to an imaging device (1) comprising a photonic integrated circuit (2). This photonic integrated circuit comprises an integrated waveguide (4) for guiding a light signal (5), a light coupler (8) optically coupled to the integrated waveguide (4) and adapted for directing the light signal (5) out of the plane of the waveguide (4) as a light beam (9), and a microfluidic channel (98) for containing an object (12) immersed in a fluid medium. The microfluidic channel is configured to enable, in operation of the device, illumination of the object by the light beam. The integrated circuit further comprises at least one imaging detector (11) positioned for imaging the object (12) illuminated by the light beam (9). The invention also relates to a corresponding method for imaging.
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  • Grating Coupler Design for Reduced Back-Reflections

    Song, Jeong Hwan   Snyder, Bradley   Lodewijks, Kristof   Jansen, Roelof   Rottenberg, Xavier  

    A grating coupler having asymmetric grating trenches for low back reflections is experimentally demonstrated. Conventional and asymmetric-trench grating couplers have been fabricated on a silicon nitride waveguide platform. Both grating couplers have fully etched trenches, which normally result in higher back reflections than shallow-etched trenches. For evaluating the back reflection characteristics, test structures based on a 3-dB multimode interference power splitter have been measured and the backreflection has been extracted from each grating coupler using an equivalent optical circuit. The designed grating coupler has no critical penalty (<0.2 dB) in coupling efficiency and similar to 5 dB lower back reflections than a conventional grating coupler design. Using ray transfer matrix modeling, further improvements to the back reflection characteristics of the asymmetric grating coupler are expected.
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  • Low-Loss Waveguide Bends by Advanced Shape for Photonic Integrated Circuits

    Song, Jeong Hwan   Kongnyuy, Tangla David   De Heyn, Peter   Lardenois, Sebastien   Jansen, Roelof   Rottenberg, Xavier  

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  • Low-Back-Reflection Grating Couplers Using Asymmetric Grating Trenches

    Song, Jeong Hwan   Rottenberg, Xavier  

    We propose a design of grating couplers having low back-reflections on silicon-on-insulator (SOI). The grating trenches are etched asymmetrically on the grating coupler. The asymmetric grating trenches help change the angle of reflected light path. Consequently, back-reflections can be reduced. The design concept has been verified by three-n-dimensional finite-difference time-domain simulations. The average back-reflection of 1-dB bandwidth in the proposed grating coupler is -44 dB. Only less than 0.3-dB penalty in fiber coupling efficiency occurs comparing with a conventional SOI-grating coupler.
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  • Silicon photonics co-integrated with silicon nitride for optical phased arrays

    Marinins, Aleksandrs   Dwivedi, Sarvagya   Kjellman, Jon   Kerman, Sarp   David, Tangla   Figeys, Bruno   Jansen, Roelof   Sabuncuoglu Tezcan, Deniz   Rottenberg, Xavier   Soussan, Philippe  

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  • Integrated Nanophotonic Excitation and Detection of Fluorescent Microparticles

    Kerman, Sap   Vercruysse, Dries   Claes, Tom   Stassen, Andim   Hasan, Md. Mahmud ul   Neutens, Pieter   Mukund, Vignesh   Verellen, Niels   Rottenberg, Xavier   Lagae, Liesbet   Van Dorpe, Pol  

    Biological microentities, such as cells and bacteria, are often detected and identified by bulky optical setups such as fluorescent microscopes and flow cytometers. Integrated photonics provides the prospect of dramatically miniaturizing these setups, enabling highly parallelized on-chip detection. In this work we designed, fabricated, and characterized a SiN photonic circuit for fluorescence detection of microentities. A tailored diffraction grating excites fluorescent particles, whose emitted light is collected in a single-mode waveguide by a second neighboring diffraction grating. Both fluorescent polystyrene microparticles and labeled peripheral blood mononuclear cells were detected in a microfluidic channel integrated on top of the waveguide circuit. We quantified both numerically and experimentally the efficiency of this grating system and obtained a good agreement. The presented on-chip fluorescent detection structure and the obtained results will strongly contribute to the development of on-chip cytometry and spectroscopy applications.
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    A light coupler (8) for optically out-coupling a light signal (5) from an integrated waveguide (4) into free space comprises a plurality of microstructures (202). The plurality of microstructures (202) are adapted in shape and position to compensate decay of the light signal (5) when propagating in the light coupler (8), and to provide a power distribution (201) of the light signal (5) when propagating in free space such that this power distribution (201) corresponds to a predetermined target power distribution. Each of the microstructures forms an optical scattering center, and the microstructures are positioned on the light coupler in accordance with a non-uniform number density distribution.
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  • Optical power distributions through fractal routing

    Jansen, Roelof   Claes, Tom   Neutens, Pieter   Du Bois, Bert   Helin, Philippe   Severi, Simone   Van Dorpe, Pol   Deshpande, Paru   Rottenberg, Xavier  

    Several applications in integrated optics require an equal distribution of power from a single input port among many photonic components, whether they be projection components or sensors. One method of achieving such a system is through using progressively more tightly coupled evanescent couplers to route power from a single feeding line Pt While very compact, this approach requires careful design and characterization of evanescent couplers, and is vulnerable to process variations as the ratio of coupling has a non-linear relation to the couplers' gap size. Fractals, widely present in nature, are recursive objects where each section is geometrically similar to its parent. They find applications in various fields [2], including RF antenna design and feeding [3]. In this paper we propose to use the fractal approach for spreading power evenly over an area using micro-machined photonic waveguides. In the fractal routing demonstrated in this work, an 1x2 multimode interference (MMI) coupler splits the power at each fractal stage. This provides several advantages. First, only one power splitter design is needed. Second, MMI couplers are well known, and more robust to process tolerances than evanescent couplers [3]. Third, they are symmetrical, and therefore provide a theoretically perfect power distribution independent of the fractal depth. We therefore demonstrate that a fractal routing provides a way to evenly and efficiently distribute power over a large area.
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  • Characterization of polymer-based PMUT for short-range gesture recognition applications

    Gijsenbergh, Pieter   Halbach, Alexandre   Jeong, Yongbin   Brondani Torri, Guilherme   Billen, Margo   Demi, Libertario   Huang, Chih-Hsien   Cheyns, David   Rottenberg, Xavier   Rochus, Véronique  

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    Disclosed is an MEMS switch that, in order for the contact resistance of a point of contact that transmits signals to be maintained at a low level, in an ON mode maintains sufficient contact force for the point of contact to have low contact resistance, even after contact. Specifically disclosed is an MEMS switch (100) that is provided with a first electrode (101), a second electrode (104) that faces the electrode (101) and is formed separated therefrom, a third electrode (1021), and a fourth electrode (1022), and that forms an electric point of contact between the electrode (101) and the electrode (104) by means of an electrostatic force between the electrode (101), and the electrode (1021) and the electrode (1022); wherein a projection that forms a point of contact between the electrode (101) and the electrode (1021) and/or the electrode (1022) is disposed on the electrode (101), a gap is formed between the electrode (101) and the electrode (1021) and/or the electrode (1022) when the aforementioned electric point of contact has been formed, and the input of a control signal to the electrode (1021) and the input of a control signal to the electrode (1022) are performed mutually independent of one another.
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  • Expanding the Silicon Photonics Portfolio With Silicon Nitride Photonic Integrated Circuits

    Rahim, Abdul   Ryckeboer, Eva   Subramanian, Ananth Z.   Clemmen, Stephane   Kuyken, Bart   Dhakal, Ashim   Raza, Ali   Hermans, Artur   Muneeb, Muhammad   Dhoore, Soren   Li, Yanlu   Dave, Utsav   Bienstman, Peter   Le Thomas, Nicolas   Roelkens, Gunther   Van Thourhout, Dries   Helin, Philippe   Severi, Simone   Rottenberg, Xavier   Baets, Roel  

    The high index contrast silicon-on-insulator platform is the dominant CMOS compatible platform for photonic integration. The successful use of silicon photonic chips in optical communication applications has now paved the way for new areas where photonic chips can be applied. It is already emerging as a competing technology for sensing and spectroscopic applications. This increasing range of applications for silicon photonics instigates an interest in exploring new materials, as silicon-on-insulator has some drawbacks for these emerging applications, e.g.,silicon is not transparent in the visible wavelength range. Silicon nitride is an alternatematerial platform. It has moderately high index contrast, and like silicon-on-insulator, it uses CMOS processes to manufacture photonic integrated circuits. In this paper, the advantages and challenges associated with these two material platforms are discussed. The case of dispersive spectrometers, which are widely used in various silicon photonic applications, is presented for these two material platforms.
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