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Compact low-birefringence polarization beam splitter using vertical-dual-slot waveguides in silicon carbide integrated platforms

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Photonics Research 2022年第1期10卷 I0008-I0013页

作者： XIAODONG SHI JINGJING ZHANG WEICHEN FAN YAOQIN LU NIANHUA PENG KARSTEN ROTTWITT AND HAIYAN OU dtu fotonik Technical University of DenmarkDK-2800 LyngbyDenmark Institute of Mirco/Nano Optoelectronic and Terahertz Technology Jiangsu UniversityZhenjiang 212013China Surrey Ion Beam Centre Surrey UniversityGuildfordGU27XHUK

The polarization beam splitter is a key component for polarization manipulation in photonic integrated circuits,but it is challenging to design for low-refractive-index optical materials,due to the low birefringence of the *** propose what we believe is a novel compact vertical-dual-slot waveguide-based coupling scheme for silicon carbide,enabling efficient low-birefringence polarization splitting by extensively modulating the transverse-magnetic mode *** numerically and experimentally demonstrate the device in the 4H-siliconcarbide-on-insulator integrated platform,with a small footprint of 2.2 μm × 15 μ*** device,easy to fabricate via a single lithography process as other components on the chip,exhibits low insertion loss of 13 dB,over 80 nm wavelength range.

关键词： polarization waveguides waveguide

Range Extension and Channel Capacity Increase in Impulse-Radio Ultra-Wideband Communications

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Tsinghua Science and Technology 2010年第2期15卷 169-173页

作者： Roberto Rodes Antonio Caballero Jesper Bevensee Jensen Timothy Braidwood Gibbon Neil Guerrero Gonzalez Idelfonso Tafur Monroy dtu fotonik Department of Photonics Engineering Technical University of Denmark

We theoretically analyze the channel capacity of a 5th-order Gaussian pulse-based ultra-wideband （UWB） system and experimentally demonstrate 2 Gbit/s UWB-over-fiber transmission systems incorporating wireless transmission. Both electrical and photonic UWB pulse generation methods are employed and its performance is compared. By utilizing optimum UWB pulse design and employing a digital signal processing （DSP） receiver, a bit-error-rate above the forward error correction （FEC） limit for 8 meters of wireless＇emis- sion is obtained in our photonic generation UWB system. A noticeable increase in the channel capacity is achieved compared to previously reported results.

关键词： impulse radio ultra-wideband UWB-over-fiber channel capacity personal area networks

Time-resolved terahertz spectroscopy of charge carrier dynamics in the chalcogenide glass As_(30)Se_(30)Te_(40)[Invited]

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Photonics Research 2016年第3期4卷 22-28页

作者： Tianwu Wang Elena A.Romanova Nabil Abdel-Moneim David Furniss Anna Loth Zhuoqi Tang Angela Seddon Trevor Benson Andrei Lavrinenko Peter Uhd Jepsen Department of Photonics Engineering (dtu fotonik) Technical University of Denmark Saratov State University Department of Physics Faculty of Engineering University of Nottingham

Broadband(1.6–18 THz) terahertz time-domain spectroscopy(THz-TDS) and time-resolved terahertz spectroscopy(TRTS) were performed on a 54 μm thick chalcogenide glass(As_(30)Se_(30)Te_(40)) sample with a two-color laser-induced air plasma THz system in transmission and reflection modes, respectively. Two absorption bands at 2–3 and 5–8 THz were observed. TRTS reveals an ultrafast relaxation process of the photoinduced carrier response, well described by a rate equation model with a finite concentration of mid-bandgap trap states for self-trapped *** photoinduced conductivity can be well described by the Drude–Smith conductivity model with a carrier scattering time of 12–17 fs, and we observe significant carrier localization effects. A fast refractive index change was observed 100 fs before the conductivity reached its maximum, with 2 orders of magnitude larger amplitude than expected for the optically induced THz Kerr effect, indicating that free carriers are responsible for the transient index change.

关键词： Te Invited Se Time-resolved terahertz spectroscopy of charge carrier dynamics in the chalcogenide glass As

Light-driven micro-tool equipped with a syringe function

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Light(Science & Applications) 2016年第1期5卷 499-505页

作者： Mark Jayson Villangca Darwin Palima Andrew Rafael Bañas Jesper Glückstad dtu fotonik Department of Photonics EngineeringTechnical University of DenmarkDK-2800Kgs.LyngbyDenmark OptoRobotix ApS Scion DTUDiplomvej 381DK-2800Kgs.LyngbyDenmark

Leveraging developments in microfabrication open new possibilities for optical *** the structural design freedom from three-dimensional printing capabilities of two-photon polymerization,we are starting to see the emergence of cleverly shaped‘light robots’or optically actuated micro-tools that closely resemble their macroscopic counterparts in function and sometimes even in *** this work,we have fabricated a new type of light robot that is capable of loading and unloading cargo using photothermally induced convection currents within the body of the *** have demonstrated this using silica and polystyrene beads as *** flow speeds of the cargo during loading and unloading are significantly larger than when using optical forces *** new type of light robot presents a mode of material transport that may have a significant impact on targeted drug delivery and nanofluidics injection.

关键词： material transport optical manipulation thermal convection two-photon fabrication

All-optical broadcast and multicast technologies based on PPLN waveguide

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Chinese Optics Letters 2013年第11期11卷 25-28页

作者：叶凌云王菊胡浩于晋龙宋开臣 College of Biomedical Engineering and Instrument Science Zhejiang University School of Electrical and Information Engineering Tianjin University dtu fotonik Department of Photonics EngineeringTechnical University of DenmarkФrsteds Plads

All-optical 1 ×4 broadcast and 1 ×3 multicast experiments of a 40-Gb/s return-to-zero on-off keying （RZ- OOK） signal based on a periodically poled lithium niobate （PPLN） waveguide are demonstrated in this letter. Clear opened eye diagrams and error-free performance are achieved for the broadcast signals at 1541.3, 1543.7, 1548.5, and 1550.9 nm. Multicast technology uses cascaded second-harmonic generation and difference-frequency generation in a Ti：PPLN waveguide. An error-free operation with a negligible power penalty is achieved for the three wavelength-division multiplexing multicast signals at 1533, 1537, and 1541 nm.

关键词： Multicasting Optical communication

Ultra-compact titanium dioxide micro-ring resonators with sub-10-μm radius for on-chip photonics

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Photonics Research 2021年第7期9卷 1416-1422页

作者： MEICHENG FU YI ZHENG GAOYUAN LI WENJUN YI JUNLI QI SHAOJIE YIN XIUJIAN LI XIAOWEI GUAN Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China dtu fotonik Technical University of DenmarkLyngby DK-2800Denmark School of Electrical Engineering Yanshan UniversityQinhuangdao 066004China

Microring resonators (MRRs) with ultracompact footprints are preferred for enhancing the light-matter interactions to benefit various applications. Here,ultracompact titanium dioxide (TiO2) MRRs with sub-10-μm radii are experimentally demonstrated. Thanks to the large refractive index of TiO_(2),the quality factors up to -7.9×10^(4) and -4.4×10^(4)are achieved for TiO_(2) MRRs with radii of 10μm and 6μm,respectively,which result in large nonlinear power enhancement factors (>113) and large Purcell factors (>56). The four-wave mixing(FWM) measurements indicate that,compared to the large MRR,the FWM conversion efficiency of the ultracompact TiO2 MRRs can be greatly improved (e.g.,-25 dB versus-31 dB),a harbinger of significant superiorities. Demonstrations in this work provide more arguments for the TiO_(2) waveguides as a promising platform for various on-chip photonic devices.

关键词： titanium dioxide radius

Thermo-mechanical dynamics of nanoimprinting anti-reflective structures onto small-core mid-IR chalcogenide fibers [Invited]

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Chinese Optics Letters 2021年第3期19卷 46-52页

作者： Christian R.Petersen Mikkel B.Lotz Christos Markos Getinet Woyessa David Furniss Angela B.Seddon Rafael J.Taboryski O.Bang dtu fotonik Technical University of DenmarkDK-2800 Kgs.LyngbyDenmark dtu Nanolab Technical University of DenmarkDK-2800 Kgs.LyngbyDenmark NORBLIS DK-2830 VirumDenmark Mid-Infrared Photonics Group University of NottinghamNottingham NG72RDUK NKT Photonics DK-3460 Bi「ke「0dDenmark

Thermal nanoimprinting is a fast and versatile method for transferring the anti-reflective properties of subwavelength nanostructures onto the surface of highly reflective substrates, such as chalcogenide glass optical fiber end faces. In this paper, the technique is explored experimentally on a range of different types of commercial and custom-drawn optical fibers to evaluate the influence of geometric design, core/cladding material, and thermo-mechanical properties. Up to32.4% increased transmission and 88.3% total transmission are demonstrated in the 2–4.3 μm band using a mid-infrared(IR) supercontinuum laser.

关键词： nanoimprint lithography anti-reflection hot imprint chalcogenide glass optical fiber mid-infrared supercontinuum

Photoluminescence control by hyperbolic metamaterials and metasurfaces:a review

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Opto-Electronic Advances 2021年第8期4卷 30-56页

作者： Leonid Yu.Beliaev Osamu Takayama Pavel N.Melentiev Andrei V.Lavrinenko dtu fotonik-Department of Photonics Engineering Technical University of Denmark0rsteds Plads 343DK-2800 Kgs.LyngbyDenmark Institute of Spectroscopy RAS Moscow 108840Russia Higher School of Economics National Research UniversityMoscow 101000Russia

Photolu min esce nee in clud ing fluoresce nee plays a great role in a wide variety of applicati ons from biomedical sensing and imag ing to optoelectr on ***,the enhan ceme nt and con trol of photolu min esce nee has imme nse impact on both fun dame ntal scie ntific research and aforeme nti oned applicati *** various nano phot tonic schemes and nanostructures to enhance the photoluminescence,we focus on a certain type of nanostructures,hyperbolic metamaterials(HMMs).HMMs are highly ani sotropic metamaterials,which produce intense localized electric ***,HMMs n aturally boost photolu min esce nee from dye molecules,qua ntum dots,n itroge n-vaca ncy cen ters in diam on ds,perovskites and tra nsiti on metal dichalcoge *** provide an overview of various con figuratio ns of HMMs,i nclud ing metal-dielectric multilayers,trenches,metallic nanowires,and cavity structures fabricated with the use of noble metals,transparent conductive oxides,and refractory metals as plasmonic *** also discuss lasing action realized with HMMs.

关键词： fluorescence metamaterials metasurfaces Purcell effect nanophotonics hyperbolic metamaterials

Nonlinearity-tailored fiber laser technology for low-noise, ultra-wideband tunable femtosecond light generation

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Photonics Research 2017年第6期5卷 262-273页

作者： XIAOMIN LIU JESPER LAEGSGAARD ROMAN IEGOROV ASK S.SVANE F.OMER ILDAY HAOHUA TU STEPHEN A.BOPPART DMITRY TURCHINOVICH dtu fotonik Technical University of Denmark Max Planck Institute for Polymer Research Department of Physics Bilkent University National Research Tomsk Polytechnic University Institute of Power Engineering Department of Electrical and Electronics Engineering Bilkent University Biophotonics Imaging Laboratory University of Illinois at Urbana-Champaign Fakultat fur Physik Universitat Duisburg-Essen

The emission wavelength of a laser is physically predetermined by the gain medium used. Consequently, arbitrary wavelength generation is a fundamental challenge in the science of light. Present solutions include optical parametric generation, requiring complex optical setups and spectrally sliced supercontinuum, taking advantage of a simpler fiber technology: a fixed-wavelength pump laser pulse is converted into a spectrally very broadband output, from which the required resulting wavelength is then optically filtered. Unfortunately, this process is associated with an inherently poor noise figure, which often precludes many realistic applications of such supercontinuum sources. Here, we show that by adding only one passive optical element—a tapered photonic crystal fiber—to a fixed-wavelength femtosecond laser, one can in a very simple manner resonantly convert the laser emission wavelength into an ultra-wide and continuous range of desired wavelengths, with very low inherent noise, and without mechanical realignment of the laser. This is achieved by exploiting the double interplay of nonlinearity and chirp in the laser source and chirp and phase matching in the tapered fiber. As a first demonstration of this simple and inexpensive technology, we present a femtosecond fiber laser continuously tunable across the entire red–green–blue spectral range.

关键词： length PCF Nonlinearity-tailored fiber laser technology for low-noise ultra-wideband tunable femtosecond light generation