The Experts below are selected from a list of 184044 Experts worldwide ranked by ideXlab platform
Gunther Roelkens - One of the best experts on this subject based on the ideXlab platform.
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2 μm Wavelength Range inp based type ii quantum well photodiodes heterogeneously integrated on silicon photonic integrated circuits
Optics Express, 2015Co-Authors: Ruijun Wang, Muhammad Muneeb, Stephan Sprengel, Gerhard Boehm, Markuschristian Amann, Roel Baets, Gunther RoelkensAbstract:The heterogeneous integration of InP-based type-II quantum well photodiodes on silicon photonic integrated circuits for the 2 µm Wavelength Range is presented. A responsivity of 1.2 A/W at a Wavelength of 2.32 µm and 0.6 A/W at 2.4 µm Wavelength is demonstrated. The photodiodes have a dark current of 12 nA at -0.5 V at room temperature. The absorbing active region of the integrated photodiodes consists of six periods of a "W"-shaped quantum well, also allowing for laser integration on the same platform.
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coherent supercontinuum generation in a silicon photonic wire in the telecommunication Wavelength Range
arXiv: Optics, 2014Co-Authors: Francois Leo, Bart Kuyken, Simonpierre Gorza, Stephane Coen, Gunther RoelkensAbstract:We demonstrate a fully coherent supercontinuum spectrum spanning 500 nm from a silicon-on-insulator photonic wire waveguide pumped at 1575 nm Wavelength. An excellent agreement with numerical simulations is reported. The simulations also show that a high level of two-photon absorption can essentially enforce the coherence of the spectral broadening process irrespective of the pump pulse duration.
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silicon based photonic integration beyond the telecommunication Wavelength Range
IEEE Journal of Selected Topics in Quantum Electronics, 2014Co-Authors: Gunther Roelkens, Utsav D Dave, Alban Gassenq, Nannicha Hattasan, Bart Kuyken, Francois Leo, Aditya Malik, Muhammad Muneeb, Eva Ryckeboer, Dorian SanchezAbstract:In this paper we discuss silicon-based photonic integrated circuit technology for applications beyond the telecommunication Wavelength Range. Silicon-on-insulator and germanium-on-silicon passive waveguide circuits are described, as well as the integration of III-V semiconductors, IV-VI colloidal nanoparticles and GeSn alloys on these circuits for increasing the functionality. The strong nonlinearity of silicon combined with the low nonlinear absorption in the mid-infrared is exploited to generate picosecond pulse based supercontinuum sources, optical parametric oscillators and Wavelength translators connecting the telecommunication Wavelength Range and the mid-infrared.
Yongkeun Park - One of the best experts on this subject based on the ideXlab platform.
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measurements of complex refractive index change of photoactive yellow protein over a wide Wavelength Range using hyperspectral quantitative phase imaging
Scientific Reports, 2018Co-Authors: Kyeoreh Lee, Youngmin Kim, Jaehwang Jung, Hyotcherl Ihee, Yongkeun ParkAbstract:A novel optical holographic technique is presented to simultaneously measure both the real and imaginary components of the complex refractive index (CRI) of a protein solution over a wide visible Wavelength Range. Quantitative phase imaging was employed to precisely measure the optical field transmitted from a protein solution, from which the CRIs of the protein solution were retrieved using the Fourier light scattering technique. Using this method, we characterized the CRIs of the two dominant structural states of a photoactive yellow protein solution over a broad Wavelength Range (461–582 nm). The significant CRI deviation between the two structural states was quantified and analysed. The results of both states show the similar overall shape of the expected rRI obtained from the Kramers–Kronig relations.
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Measurements of complex refractive index change of photoactive yellow protein over a wide Wavelength Range using hyperspectral quantitative phase imaging
NATURE PUBLISHING GROUP, 2018Co-Authors: Kyereh Lee, Youngmin Kim, Jaehwang Jung, Hyotcherl Ihee, Yongkeun ParkAbstract:A novel optical holographic technique is presented to simultaneously measure both the real and imaginary components of the complex refractive index (CRI) of a protein solution over a wide visible Wavelength Range. Quantitative phase imaging was employed to precisely measure the optical field transmitted from a protein solution, from which the CRIs of the protein solution were retrieved using the Fourier light scattering technique. Using this method, we characterized the CRIs of the two dominant structural states of a photoactive yellow protein solution over a broad Wavelength Range (461-582 nm). The significant CRI deviation between the two structural states was quantified and analysed. The results of both states show the similar overall shape of the expected rRI obtained from the Kramers-Kronig relations. © 2018 The Author(s
John A Lehman - One of the best experts on this subject based on the ideXlab platform.
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200 spl deg c 96 nm Wavelength Range continuous wave lasing from unbonded gaas movpe grown vertical cavity surface emitting lasers
IEEE Photonics Technology Letters, 1995Co-Authors: Robert A Morgan, Mary K Hibbsbrenner, Terry Marta, R A Walterson, Sommy Bounnak, Edith Kalweit, John A LehmanAbstract:We report record temperature and Wavelength Range attained using MOVPE-grown AlGaAs vertical cavity surface-emitting lasers (VCSEL's). Unbonded continuous-wave lasing is achieved at temperatures up to 200/spl deg/C from these top-emitting VCSEL's and operation over a 96-nm Wavelength regime near 850 nm is also achieved from the same nominal design. Temperature and Wavelength insensitive operation is also demonstrated; threshold current is controlled to within a factor of 2 (2.5-5 mA) for a Wavelength Range exceeding 50 nm and to within /spl plusmn/30% (5-10 mA) for a temperature Range of 190/spl deg/C at 870 nm. >
Seongran Jeon - One of the best experts on this subject based on the ideXlab platform.
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ultraviolet light emitting diodes operating in the 340nm Wavelength Range and application to time resolved fluorescence spectroscopy
Applied Physics Letters, 2004Co-Authors: Hongbo Peng, E Makarona, Y He, Yoonkyu Song, A V Nurmikko, J Su, M Gherasimova, Seongran JeonAbstract:We report on the development of UV light-emitting diodes in the 340nm Wavelength Range, based on quaternary AlGaInN quantum-well active media. Output powers up to 1mW from small area devices (<100μm diameter) directly off a planar chip have been achieved. The devices have been operated as subnanosecond pulsed sources to demonstrate their applicability to compact time-resolved fluorescence spectroscopy.
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ultraviolet light emitting diodes operating in the 340 nm Wavelength Range and application to time resolved fluorescence spectroscopy
Applied Physics Letters, 2004Co-Authors: Hongbo Peng, E Makarona, Yoonkyu Song, A V Nurmikko, M Gherasimova, Seongran Jeon, Z Ren, G Cui, J HanAbstract:We report on the development of UV light-emitting diodes in the 340nm Wavelength Range, based on quaternary AlGaInN quantum-well active media. Output powers up to 1mW from small area devices (<100μm diameter) directly off a planar chip have been achieved. The devices have been operated as subnanosecond pulsed sources to demonstrate their applicability to compact time-resolved fluorescence spectroscopy.
Muhammad Muneeb - One of the best experts on this subject based on the ideXlab platform.
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iii v on silicon photonic integrated circuits for spectroscopic sensing in the 2 4 μm Wavelength Range
Sensors, 2017Co-Authors: Ruijun Wang, Aditya Malik, Muhammad Muneeb, Anton Vasiliev, Stephan Sprengel, Gerhard Boehm, Markuschristian Amann, Ieva Simonytė, Augustinas Vizbaras, Kristijonas VizbarasAbstract:The availability of silicon photonic integrated circuits (ICs) in the 2–4 μm Wavelength Range enables miniature optical sensors for trace gas and bio-molecule detection. In this paper, we review our recent work on III–V-on-silicon waveguide circuits for spectroscopic sensing in this Wavelength Range. We first present results on the heterogeneous integration of 2.3 μm Wavelength III–V laser sources and photodetectors on silicon photonic ICs for fully integrated optical sensors. Then a compact 2 μm Wavelength widely tunable external cavity laser using a silicon photonic IC for the Wavelength selective feedback is shown. High-performance silicon arrayed waveguide grating spectrometers are also presented. Further we show an on-chip photothermal transducer using a suspended silicon-on-insulator microring resonator used for mid-infrared photothermal spectroscopy.
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2 μm Wavelength Range inp based type ii quantum well photodiodes heterogeneously integrated on silicon photonic integrated circuits
Optics Express, 2015Co-Authors: Ruijun Wang, Muhammad Muneeb, Stephan Sprengel, Gerhard Boehm, Markuschristian Amann, Roel Baets, Gunther RoelkensAbstract:The heterogeneous integration of InP-based type-II quantum well photodiodes on silicon photonic integrated circuits for the 2 µm Wavelength Range is presented. A responsivity of 1.2 A/W at a Wavelength of 2.32 µm and 0.6 A/W at 2.4 µm Wavelength is demonstrated. The photodiodes have a dark current of 12 nA at -0.5 V at room temperature. The absorbing active region of the integrated photodiodes consists of six periods of a "W"-shaped quantum well, also allowing for laser integration on the same platform.
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silicon based photonic integration beyond the telecommunication Wavelength Range
IEEE Journal of Selected Topics in Quantum Electronics, 2014Co-Authors: Gunther Roelkens, Utsav D Dave, Alban Gassenq, Nannicha Hattasan, Bart Kuyken, Francois Leo, Aditya Malik, Muhammad Muneeb, Eva Ryckeboer, Dorian SanchezAbstract:In this paper we discuss silicon-based photonic integrated circuit technology for applications beyond the telecommunication Wavelength Range. Silicon-on-insulator and germanium-on-silicon passive waveguide circuits are described, as well as the integration of III-V semiconductors, IV-VI colloidal nanoparticles and GeSn alloys on these circuits for increasing the functionality. The strong nonlinearity of silicon combined with the low nonlinear absorption in the mid-infrared is exploited to generate picosecond pulse based supercontinuum sources, optical parametric oscillators and Wavelength translators connecting the telecommunication Wavelength Range and the mid-infrared.
