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Carrier lifetime of GeSn measured by spectrally resolved picosecond photoluminescence spectroscopy

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Photonics Research 2020年第6期8卷 788-798页

作者： BRIAN JULSGAARD NILS VON DEN DRIESCH PETER TIDEMAND-LICHTENBERG CHRISTIAN PEDERSEN ZORAN IKONIC DAN BUCA Department of Physics and Astronomy Aarhus UniversityNy Munkegade 120DK-8000 Aarhus CDenmark Peter Grinberg Institute 9(PGI 9) Forschungszentrum Jilich52425 JilichGermany JARA-Institut Green IT RWTH AachenGermany dtu fotonik Technical University of DenmarkFrederiksborgvej 399DK-4000 RoskildeDenmark Pollard Institute School of Electronic and Electrical EngineeringUniversity of LeedsLeedsUK

We present an experimental setup capable of time resolved photoluminescence spectroscopy for photon energies in the range of0.51 to 0.56 eV with an instrument time response of75 *** detection system is based on optical parametric three wave mixing,operates at room temperature,has spectral resolving power,and is shown to be well suited for investigating dynamical processes in germanium-tin *** particular,the carrier lifetime ofa direct-bandgap Ge1-xSnx film with concentration x=12.5%and biaxial strain-0.55%is determined to be 217±15 ps at a temperature of 20 K.A room-temperature investigation indicates that the variation in this life-time with temperature is very *** characteristics of the photoluminescence as a function of pump fuence are discussed.

关键词： lifetime resolved spectral

Dual-polarization wavelength conversion of 16-QAM signals in a single silicon waveguide with a lateral p-i-n diode[Invited]

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Photonics Research 2018年第5期6卷 I0048-I0054页

作者： FRANCESCO DA Ros ANDRZEJ GAJDA ERIK LIEBIG EDSON P.DA SILVA ANNA PECZEK PETER D.GIROUARD ANDREAS MAI KLAUS PETERMANN LARS ZIMMERMANN MICHAEL GALILI LEIF K.OXENLOWE dtu fotonik Technical University of DenmarkDK-2800 Kongens LyngbyDenmark IHP Im Technologiepark 2515236 Frankfurt(Oder)Germany IHP Solutions GmbH Im Technologiepark 2515236 Frankfurt(Oder)Germany Institut for Hochfrequenz-und Halbleiter-Systemtechnologien TU BerlinEinsteinufer 2510587 BerlinGermany AMETEK CTS Europe GmbH L unener StraBe 211-21259174 KamenGermany

A polarization-diversity loop with a silicon waveguide with a lateral p-i-n diode as a nonlinear medium is used to realize polarization insensitive four-wave mixing. Wavelength conversion of seven dual-polarization 16-quadrature amplitude modulation(QAM) signals at 16 GBd is demonstrated with an optical signal-to-noise ratio penalty below 0.7 dB. High-quality converted signals are generated thanks to the low polarization dependence(≤0.5 dB) and the high conversion efficiency(CE) achievable. The strong Kerr nonlinearity in silicon and the decrease of detrimental free-carrier absorption due to the reverse-biased p-i-n diode are key in ensuring high CE levels.

关键词： Invited Dual-polarization wavelength conversion of 16-QAM signals in a single silicon waveguide with a lateral p-i-n diode QAM

Characterization and stability measurement of deployed multicore fibers for quantum applications

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Photonics Research 2021年第10期9卷 1992-1997页

作者： DAVIDE BACCO NICOLA BIAGI ILARIA VAGNILUCA TETSUYA HAYASHI ANTONIO MECOZZI CRISTIAN ANTONELLI LEIF KOXENLØWE ALESSANDRO ZAVATTA CoE SPOC DTU FotonikTechnical University of Denmark2800 Kgs.LyngbyDenmark Istituto Nazionale di Ottica(CNR-INO) Largo E.Fermi 650125 FlorenceItaly LENS and Department of Physics and Astronomy University of Florence50019 Sesto FiorentinoItaly Department of Physics“Ettore Pancini” University of Naples“Federico II”Via Cinthia 2180126 NaplesItaly Optical Communications Laboratory Sumitomo Electric IndustriesLtd.244-8588 YokohamaJapan Department of Physical and Chemical Sciences University of L’Aquila67100 L’AquilaItaly National Laboratory of Advanced Optical Fibers for Photonics(FIBERS) CNIT67100 L’AquilaItaly

Multicore fibers are expected to be a game-changer in the coming decades thanks to their intrinsic properties,allowing a larger transmission bandwidth and a lower footprint in optical *** addition,multicore fibers have recently been explored for quantum communication,attesting to their uniqueness in transporting high-dimensional quantum ***,investigations and experiments reported in literature have been carried out in research laboratories,typically making use of short fiber links in controlled ***,the possibility of using long-distance multicore fibers for quantum applications is still to be *** characterize here for the first time,to the best of our knowledge,in terms of phase stability,multiple strands of a four-core multicore fiber installed underground in the city of L’Aquila,with an overall fiber length up to about 25 *** this preliminary study,we investigate the possibility of using such an infrastructure to implement quantumenhanced schemes,such as high-dimensional quantum key distribution,quantum-based environmental sensors,and more,in general,quantum communication protocols.

关键词： quantum fibers stability

Photoswitchable molecular dipole antennas with tailored coherent coupling in glassy composite

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Light(Science & Applications) 2015年第1期4卷 259-266页

作者： Mady Elbahri Ahnaf Usman Zillohu Bastian Gothe Mehdi Keshavarz Hedayati Ramzy Abdelaziz Hala Jarallah El-Khozondar Muhammad Bawa’aneh Moheb Abdelaziz Andrei Lavrinenko Sergei Zhukovsky Shahin Homaeigohar Nanochemistry and Nanoengineering Faculty of EngineeringInstitute for Materials ScienceUniversity of KielKaiserstrasse 224143 KielGermany Nanochemistry and Nanoengineering Institute of Polymer ResearchHelmholtz-Zentrum GeesthachtMax-Planck-Strasse 121502 GeesthachtGermany Refractories Ceramics and Building Materials DepartmentNational Research CentreDokkiCairoEgypt Electrical Engineering Department Islamic University of GazaGazaPO Box 108Palestine The Hashemite University Department of PhysicsZarqaJordan&Khalifa University of ScienceTechnology&Research(KUSTAR)PO Box 573SharjahUAE dtu fotonik Technical University of DenmarkOersteds pl.343Kongens LyngbyDK-2800Denmark

Here,we introduce the first experimental proof of coherent oscillation and coupling of photoswitchable molecules embedded randomly in a polymeric matrix and acting cooperatively upon illumination with UV *** particular,we demonstrate the specular reflection and Brewster phenomenon alteration of photochromic molecular dipole *** successfully demonstrate the concept of Brewster wavelength,which is based on the dipolar interaction between radiating dipoles and the surrounding matrix possessing a net dipole moment,as a key tool for highly localized sensing of matrix *** also introduce the concept of‘tailored molecular photonic coupling’while highlighting the role of interferences for the design of optically active media by adjusting the photonic response of the medium with the real and imaginary refractive index of photoswitchable molecules in the‘ON’*** results enhance our fundamental understanding of coherent dipole radiation and open a new vein of research based on glassy disordered dipolar composites that act as macroscopic antenna with cooperative action;furthermore,these results have important implications for new design rules of tailored photonics.

关键词： Brewster angle coherent coupling collective oscillation photoswitchable molecular photonics specular reflection

Real-time high-resolution mid-infrared optical coherence tomography

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Light(Science & Applications) 2019年第1期8卷 1076-1088页

作者： Niels M.Israelsen Christian R.Petersen Ajanta Barh Deepak Jain Mikkel Jensen Gunther Hannesschlager Peter Tidemand-Lichtenberg Christian Pedersen Adrian Podoleanu Ole Bang dtu fotonik Technical University of Denmark2800 KgsLyngbyDenmark NORBLIS IVS Virumgade 35 DVirum 2830Denmark Research Center for Non-Destructive Testing(RECENDT) Altenberger Straße 694040 LinzAustria NLIR ApS Hirsemarken 1Farum 3520Denmark Applied Optics Group School of Physical SciencesUniversity of KentCanterbury CT27NHUK

The potential for improving the penetration depth of optical coherence tomography systems by using light sources with longer wavelengths has been known since the inception of the technique in the early ***,the development of mid-infrared optical coherence tomography has long been challenged by the maturity and fidelity of optical components in this spectral region,resulting in slow acquisition,low sensitivity,and poor axial *** this work,a mid-infrared spectral-domain optical coherence tomography system operating at a central wavelength of 4μm and an axial resolution of 8.6μm is *** system produces two-dimensional cross-sectional images in real time enabled by a high-brightness 0.9-to 4.7-μm mid-infrared supercontinuum source with a pulse repetition rate of 1 MHz for illumination and broadband upconversion of more than 1-μm bandwidth from 3.58–4.63μm to 820–865 nm,where a standard 800-nm spectrometer can be used for fast *** images produced by the mid-infrared system are compared with those delivered by a state-of-the-art ultra-high-resolution near-infrared optical coherence tomography system operating at 1.3μm,and the potential applications and samples suited for this technology are *** doing so,the first practical mid-infrared optical coherence tomography system is demonstrated,with immediate applications in real-time non-destructive testing for the inspection of defects and thickness measurements in samples that exhibit strong scattering at shorter wavelengths.

关键词： resolution repetition illumination

Shot-noise limited, supercontinuum-based optical coherence tomography

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Light(Science & Applications) 2021年第7期10卷 1372-1384页

作者： Shreesha Rao D.S. Mikkel Jensen Lars Grüner-Nielsen Jesper Toft Olsen Peter Heiduschka Björn Kemper Jürgen Schnekenburger Martin Glud Mette Mogensen Niels Møller Israelsen Ole Bang dtu fotonik Dept.of Photonics EngineeringTechnical University of DenmarkØrsteds Plads2800 Kongens LyngbyDenmark NKT Photonics A/S Blokken 843460 BirkerødDenmark Department of Ophthalmology University of Münster Medical CentreDomagkstr.15D-48149 MünsterGermany Biomedical Technology Center of the Medical Faculty University of MünsterMendelstr.17D-48149 MünsterGermany Department of Dermatology Bisbebjerg HospitalUniversity of CopenhagenBispebjerg Bakke 232400 Copenhagen NVDenmark

We present the first demonstration of shot-noise limited supercontinuum-based spectral domain optical coherence tomography(SD-OCT)with an axial resolution of 5.9μm at a center wavelength of 1370 *** supercontinuumbased SD-OCT systems cannot be operated in the shot-noise limited detection regime because of severe pulse-topulse relative intensity noise of the supercontinuum *** overcome this disadvantage,we have developed a low-noise supercontinuum source based on an all-normal dispersion(ANDi)fiber,pumped by a femtosecond *** noise performance of our 90 MHz ANDi fiber-based supercontinuum source is compared to that of two commercial sources operating at 80 and 320 MHz repetition *** show that the low-noise of the ANDi fiber-based supercontinuum source improves the OCT images significantly in terms of both higher contrast,better sensitivity,and improved *** SD-OCT imaging of skin,retina,and multilayer stacks we conclude that supercontinuumbased SD-OCT can enter the domain of shot-noise limited detection.

关键词： fiber optical pumped