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UV-LED projection photolithography for high-resolution functional photonic components

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Microsystems & Nanoengineering 2021年第4期7卷 149-159页

作者： Lei Zheng Urs Zywietz Tobias Birr Martin Duderstadt Ludger Overrmeyer Bernhard Roth Carsten Reinhardt Hannover Centre for Optical Technologies Leibniz University HannoverHannoverLower Saxony 30167Germany cluster of excellence phoenixd(Photonics Opticsand Engineering-Innovation Across Disciplines)HannoverLower Saxony 30167Germany Laser Zentrum Hannover e.V HannoverLower Saxony 30167Germany Institute of Transport and Automation Technology Leibniz University HannoverGarbsenLower Saxony 30823Germany Bremen University of Applied Science BremenBremen 28199Germany

The advancement of micro-and nanostructuring techniques in optics is driven by the demand for continuous miniaturization and the high geometrical accuracy of photonic devices and integrated ***,UV-LED projection photolithography is demonstrated as a simple and low-cost approach for rapid generation of two-dimensional optical micro-and nanostructures with high resolution and accuracy using standard optics *** developed system enables the projection of structure patterns onto a substrate with 1000-fold *** devices,e.g.,waveguides and microring resonators,on rigid or flexible substrates with varied geometrical complexity and overall structure dimensions from the nanometer to centimeter scale were successfully *** particular,high-resolution gratings with feature sizes down to 150 nm and periods as small as 400 nm were realized for the first time by this *** made of doped laser active materials were fabricated,and their spontaneous emission was *** demonstrated superior performance of the developed approach may find wide applications in photonics,plasmonics,and optical materials science,among others.

关键词： projection resolution optics

Widely tunable,high-power,femtosecond noncollinear optical parametric oscillator in the visible spectral range

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Photonics Research 2021年第9期9卷 1715-1718页

作者： ROBIN MEVERT YULIYA BINHAMMER CHRISTIAN M.DIETRICH LUISE BEICHERT JOSéR.CARDOSO DE ANDRADE THOMAS BINHAMMER JINTAO FAN UWE MORGNER Institute of Quantum Optics Leibniz University HannoverWelfengarten 1D-30167 HannoverGermany cluster of excellence phoenixd Welfengarten 1D-30167 HannoverGermany neoLASE GmbH Hollerithallee 17D-30419 HannoverGermany

Ultrafast visible radiation is of great importance for many applications ranging from spectroscopy to *** some regions in the visible range are not covered by laser gain media,optical parametric oscillators offer an added *** a high-power broadband laser source,the ability to rapidly tune the frequency of pulses with high-power spectral density offers an extra benefit for experiments such as multicolor spectroscopy or ***,we demonstrate a broadband,high-power,rapidly tunable femtosecond noncollinear optical parametric oscillator with a signal tuning range of 440–720 nm in the visible *** oscillator is pumped by the third harmonic of an Yb-fiber laser at 345 nm with a repetition rate of 50.2 ***,the signal wavelength is tuned by changing the cavity length only,and output powers up to 452 m W and pulse durations down to 268 fs are *** is,to the best of our knowledge,the first demonstration of a quickly tunable femtosecond optical parametric oscillator that covers nearly the entire visible spectral range with high output power.

关键词： tunable power tuning

Advancements in nanofluidics:Unveiling the dynamics of nanoconfined water and its implications for emerging technologies

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 172-174页

作者： Bohayra Mortazavi Ali Akbar Zinatizadeh Institute of Photonics Department of Mathematics and PhysicsLeibniz Universität HannoverWelfengarten 1AHannover 30167Germany cluster of excellence phoenixd Leibniz Universität HannoverWelfengarten 1AHannover 30167Germany Department of Applied Chemistry Faculty of ChemistryRazi UniversityKermanshah 67144-14971Iran Australian Centre for Water and Environmental Biotechnology(ACWEB formerly AWMC)Gehrmann BuildingThe University of QueenslandBrisbane 4072Australia

Over the past two decades,nanofluidics[1]has emerged as a pivotal field with profound implications across various disciplines,including fluid mechanics,condensed matter physics,engineering,materials science,and *** confining and manipulating liquids,gases,ions,and other complex fluids at the nanoscale,nanofluidics enables unprecedented control over their behavior and properties.

关键词： properties fluid dynamics

Two-channel, dual-beam-mode, wavelength-tunable femtosecond optical parametric oscillator

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Advanced Photonics 2020年第4期2卷 24-28页

作者： Jintao Fan Jun Zhao Liping Shi Na Xiao Minglie Hu Tianjin University College of Precision Instrument and Optoelectronics EngineeringUltrafast Laser LaboratoryTianjinChina Leibniz Universität Hannover Institut für QuantenoptikHannoverGermany cluster of excellence phoenixd(Photonics Opticsand Engineering-Innovation Across Disciplines)HannoverGermany

Optical vortices,which carry orbital angular momentum,offer special capabilities in a host of applications.A single-laser source with dual-beam-mode output may open up new research fields of nonlinear optics and quantum *** demonstrate a dual-channel scheme to generate femtosecond,dualwavelength,and dual-beam-mode tunable signals in the near infrared wavelength ***-wavelength operation is derived by stimulating two adjacent periods of a periodically poled lithium niobate *** by an Yb-doped fiber laser with a Gaussian(lp?0)beam,two tunable signal emissions with different beam modes are observed *** one of the emissions can be tuned from1520 to 1613 nm with the Gaussian(ls?0)beam,the other is capable of producing a vortex spatial profile with different vortex orders(ls?0 to 2)tunable from 1490 to 1549 *** proposed system provides unprecedented freedom and will be an exciting platform for super-resolution imaging,nonlinear optics,multidimensional quantum entanglement,etc.

关键词： nonlinear optics parametric processes optical parametric oscillators ultrafast nonlinear optics

xtraction of internal phase motions in femtosecond soliton molecules using an orbital-angular-momentum-resolved method

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Photonics Research 2020年第10期8卷 1580-1585页

作者： YUWEI ZHAO JNTAO FAN YOUJIAN SONG UWE MORGNER MINGLIE HU Uitrafast Laser Laboratory Key Laboratory of Opto-electronic Information Science and Technology of Mlinistry of EducationSchool of Precision Instruments and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Institut fiur Quanteroptik Leibniz Universitat HannoverWelfengarten 130167 HaninaverGermeny cluster of excellence phoenixd(Photonics Opticsand Engineering-rnrnovation Across Disciplines)30167 HannoverGermany Laser Zentrum Hannover e.V Hollerithalice 830419 HannoverGermany

Internal motions in femtosecond soliton molecules provide insight into universal collective dynamics in various nonlinear *** we introduce an orbital-angular-momentum(OAM)-resolved method that maps the relative phase motion within a femtosecond soliton molecule into the rotational movement of the interferometric beam profile of two optical *** this means,long-term relative phase evolutions of doublet and triplet soliton molecules generated in an all-polarization-maintaining mode-locked Er-fiber laser are *** simple and practical OAM-resolved method represents a promising way to directly visualize the complex phase dynamics in a diversity of multisoliton structures.

关键词： polarization soliton resolved

A Systematic Molecular Dynamics Investigation on the Graphene Polymer Nanocomposites for Bulletproofing

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Computers, Materials & Continua 2020年第12期65卷 2009-2032页

作者： Hamidreza Noori Zi Goangseup Bohayra Mortazavi Alessandro Di Pierro Emad Jomehzadeh Xiaoying Zhuang Kim Sang-Hyun Timon Rabczuk Institute of Structural Mechanics Bauhaus-Universität WeimarWeimarD-99423Germany Chair of Computational Science and Simulation Technology Department of Mathematics and PhysicsLeibniz Universität HannoverHannover30157Germany cluster of excellence phoenixd(Photonics Opticsand Engineering-Innovation Across Disciplines)Gottfried Wilhelm Leibniz Universität HannoverHannoverGermany Dipartimento di ScienzaApplicata e Tecnologia Politecnico di TorinoAlessandria CampusAlessandria15121Italy Faculty of Mechanical and Material Engineering Graduate University of Advanced TechnologyKermanIran School of Civil Environmental and Architectural EngineeringKorea UniversitySeoulKorea Chief Research Engineer Mechanical Engineering R&D LabLIG Nex1Seung NamKorea Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

In modern physics and fabrication technology,simulation of projectile and target collision is vital to improve design in some critical applications,like;bulletproofing and medical ***,the most prominent member of two dimensional materials presents ultrahigh tensile strength and ***,polydimethylsiloxane(PDMS)is one of the most important elastomeric materials with a high extensive application area,ranging from medical,fabric,and interface *** this work we considered graphene/PDMS structures to explore the bullet resistance of resulting *** this aim,extensive molecular dynamic simulations were carried out to identify the penetration of bullet through the graphene and PDMS composite *** this paper,we simulate the impact of a diamond bullet with different velocities on the composites made of single-or bi-layer graphene placed in different positions of PDMS *** underlying mechanism concerning how the PDMS improves the resistance of graphene against impact loading is *** discuss that with the same content of graphene,placing the graphene in between the PDMS result in enhanced bullet *** work comparatively examines the enhancement in design of polymer nanocomposites to improve their bulletproofing response and the obtained results may serve as valuable guide for future experimental and theoretical studies.

关键词： Graphene nanocomposites bulletproofing impact PDMS