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检索条件"任意字段=Optical Materials and Biomaterials in Security and Defence Systems Technology IX"

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optical materials and biomaterials in security and defence systems technology ix

Optical Materials and Biomaterials in Security and Defence S...

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optical materials and biomaterials in security and defence systems technology ix

ISBN: (纸本)9780819492869

The proceedings contain 17 papers. The topics discussed include: influence of the geometric shape of silver nanoparticles on optical limiting;mid- to long-wavelength infrared surface plasmon properties in doped zinc oxides;effects of the liquid-crystalline order on the light-induced deformation of azobenzene elastomers;two photon photosensitizers for PDT: molecular engineering towards understanding of their excited state photophysics;spectroelectrochemistry as a strategy for improving selectivity of sensors for security and defense applications;experimental design-based strategy for the simulation of complex gaseous mixture spectra to detect drug precursors;drugs and precursor sensing by complementing low cost multiple techniques: overview of the European FP7 project CUSTOM;analysis and design of a multisensory array for explosive substances based on solid electrodes;and drug precursor vapor phase sensing by cantilever enhanced photoacoustic spectroscopy and quantum cascade laser.

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Nonlinear optical materials for Sensor Protection against Pulsed Laser Radiation in the Visible Spectral Region 2

Nonlinear Optical Materials for Sensor Protection against Pu...

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

作者： Dengler, Stefanie Henrichsen, Michael Fraunhofer IOSB Fraunhofer Institute of Optronics System Techhnologies and Image Exploitation Gutleuthausstr. 1 Ettlingen76275 Germany

ISBN: (纸本)9781510681187

The growing use of lasers increases the risk of accidental or intentional damage to human eyes and optical sensor systems. Current protection equipment is based on optical filters with fixed spectral transmission bands or shutter systems, but optical filters only work in predefined wavebands and shutter-systems are too slow to protect against pulsed laser radiation. Passive self-activated devices, in contrast, offer the potential for short response times with a simple design. Nonlinear optical materials with the capability to strongly attenuate intense laser beams are particularly interesting. In this work, we present our research on the protection capability of C60 and self-produced silver nanoparticles as functional materials in a real application case. A camera with CMOS sensor can be completely protected from being damaged up to a maximum measured input energy of 2 mJ. Therefore, it has been demonstrated that optical limiting materials can be suitable in laser protection applications. © 2024 SPIE.

关键词： Silver nanoparticles

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Direct 3D Printing of Smooth optical Elements 2

Direct 3D Printing of Smooth Optical Elements

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

作者： Herder, Martin Kuehr, Stephan xolo GmbH Volmerstr. 9b Berlin12489 Germany

ISBN: (纸本)9781510681187

Xolography is a volumetric 3D printing method utilizing dual-color photoinitiators to fabricate layer-free objects from photopolymer resins, ranging from millimeters to centimeters in size. It enables fast, continuous printing producing objects with smooth surfaces and free of internal interfaces immediately after printing and postcuring. Xolography has the potential to revolutionize prototyping and fabrication of optical elements by allowing their rapid additive manufacturing without the need for additional surface treatment. © 2024 SPIE.

关键词： Color printing

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II

Advanced Materials, Biomaterials, and Manufacturing Technolo...

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

ISBN: (纸本)9781510681187

The proceedings contain 9 papers. The topics discussed include: toward frugal calibration protocols for intelligent programmable meta-imagers;direct 3D printing of smooth optical elements;graphene-based electronic devices for radiation detection and thermosensing;spin-coated synthesis of polyvinylidene fluoride-barium titanate nanocomposite piezoelectric flexible thin films;optical and ultrasound transmission through additively printed transparent polymer;nonlinear optical materials for sensor protection against pulsed laser radiation in the visible spectral region;ultrashort pulsed laser welding of co-doped Er,Yb:Phosphate laser glass and Nd:YAG laser crystals to structural materials for robust mechanical mounting and thermal management;carrier injection via V-defects for efficient green and red GaN LEDs;and examination of degradation degree of fingerprints for visualizing aged fingerprint using an ultraviolet laser.

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optical and ultrasound transmission through additively printed transparent polymer 2

Optical and ultrasound transmission through additively print...

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

作者： Laidoudi, F. Fourar, I. Kanouni, F. Mebarki, M. Chadi, K. Research Center in Industrial Technologies CRTI P.O. Box 64 Cheraga Algiers16014 Algeria Research Unit in Optics and Photonics Center for Development of Advanced Technologies University of Setif 1 El-Bez Setif19000 Algeria El-Alia Po. Box 32 Bab-Ezzouar 16111 Algiers Algeria

ISBN: (纸本)9781510681187

This paper presents the optical and acoustic characterization of an additively printed transparent polymer. Digital light processing DLP technic is used for printing transparent polymer when the acoustic and optical transmission were measured by ultrasonic transducers and UV spectroscopy. The 3D acoustic characterization of the polymer has shown slight anisotropic behavior with a longitudinal and shear velocities of 2488 m/s and 1133 m/s respectively. On the other hand, an anisotropic optical transmission and reflection have been shown. The obtained results are interesting in the development of acoustical and optical devices. © 2024 SPIE.

关键词： Ultrasonic transmission

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Optimized Dynamic Control of Photonic Power Dividers Using Sb2Se3 Phase-Change materials 9

Optimized Dynamic Control of Photonic Power Dividers Using S...

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Emerging Imaging and Sensing Technologies for security and defence ix 2024

作者： Shlebik, Manal Aziz, Mustafa Wright, David University of Exeter Exeter United Kingdom

ISBN: (数字)9781510681170

ISBN: (纸本)9781510681163

This paper explores the modelling of an integrated photonic power divider that utilizes the degree of crystallization of an Sb2Se3 phase-change material (PCM) patch to achieve variable power distribution ratios. The fraction of crystallinity of Sb2Se3, ranging from 0 to 1, provides a dynamic control mechanism for the device. Simulations were performed using a combination of optimization algorithms and wave optics interface within COMSOL Multiphysics® to arrive at the optimum distribution of amorphous and crystalline fractions to achieve a required power distribution. The transmission coefficients serve as control variables to direct light to the upper or lower port, allowing the power divider to function as a reconfigurable and compact photonic device. These findings provide valuable insights into the use of PCMs for advancing photonic power dividers. © 2024 SPIE.

关键词： Photonic devices

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Emerging Imaging and Sensing Technologies for security and defence ix 2024

Emerging Imaging and Sensing Technologies for Security and D...

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Emerging Imaging and Sensing Technologies for security and defence ix 2024

ISBN: (纸本)9781510681163

The proceedings contain 12 papers. The topics discussed include: bimodal vision system combining standard camera and dynamic vision sensor for detecting and tracking fast UAVs;VIS-NIR multispectral for camouflage detection: campaign analysis;event-based real-time detection and tracking of UAVs;advanced perception using single photon imaging;rapid single-photon 3D imaging in highly scattering underwater environments;fast readout of innovative glow discharge detector focal plane arrays for affordable millimeter wave imaging: design, implementation, and advancements;and optimized dynamic control of photonic power dividers using sb2se3 phase-change materials.

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Ultrashort pulsed laser welding of co-doped Er,Yb:Phosphate Laser Glass and Nd:YAG Laser Crystals to structural materials for robust mechanical mounting and thermal management 2

Ultrashort pulsed laser welding of co-doped Er,Yb:Phosphate ...

引用

Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

作者： Dzipalski, Adrian McGann, Owen Carter, Richard M. Daniel Esser, M.J. Hand, Duncan P. Riccarton EdinburghEH144AS United Kingdom Glass Technology Services 9 Churchhill Way Chapeltown South Yorkshire SheffieldS352PY United Kingdom

ISBN: (纸本)9781510681187

Ultrashort pulsed laser welding of dissimilar materials has become an attractive alternative technique to commonly used adhesive bonding for joining optics to metal mounts / assemblies in the manufacturing of optical and laser systems. The laser welding process relies on very high peak intensities from an ultrashort (ps/fs) pulsed laser beam which is tightly focused through a transmissive optical component, providing a focal spot in the vicinity of the optic-metal interface. Nonlinear multi photon absorption in the optic and linear absorption in the metal results in a highly confined plasma, surrounded by a localised melt zone that rapidly cools to form a bond. For successful welding, the laser pulse repetition rate must be sufficiently high to provide thermal accumulation, to ensure a localised melt volume (the heat-affected zone, HAZ) surrounding the small plasma. The size of this HAZ is dependent on the laser processing parameters and material combinations used during the process and is typically on the ~100µm scale. As the laser spot translates across the material, this highly localised melt/plasma zone rapidly solidifies behind the beam and forms a strong bond (micro weld) between the two surfaces. We present our recent results from the ultrashort pulsed laser welding of Er,Yb:Phosphate laser glass and Nd:YAG laser crystals to copper for a combination of mechanical mounting and thermal management (heatsinking) applications in laser systems. Er,Yb:Phosphate glass is a well-known and commonly used active medium for lasers emitting in the ‘eye-safe’ spectral range from 1.5-1.6µm. Nd:YAG is the most popular lasing media for solid state lasers typically emitting light in the 1.064µm spectral range. We investigate the influence of laser processing parameters such as pulse duration and repetition rate on the resultant welds. Analysis of welded parts includes shear strength and accelerated lifetime tests. © 2024 SPIE.

关键词： Pulsed lasers

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optical and Manufacturing design aware flow for Metalenses

Optical and Manufacturing design aware flow for Metalenses

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence 2023

作者： Chalony, M. Kuechler, B. Zimmermann, R. Xu, C. Melvin, L. Viasnoff, E. Synopsys EV Pole D’Active Hyèrois 1128 Route de Toulon Hyeres83400 France Synopsys GmbH Karl-Hammerschmidt-Strasse 34/Dornach AschheimD-85609 Germany Synopsys Inc 400 Executive Boulevard Suite 101 OssiningNY10562 United States Synopsys Inc 690 E. Middlefield Road Mountain ViewCA United States Synopsys Inc 2025 Cornelius Pass Road HillsboroOR97124 United States

ISBN: (纸本)9781510667112

Metalenses pave the way for drastic miniaturization of imaging systems like electric vehicle cameras, phones, and various other micro-camera applications1. As an example, researchers in the U.S. used semiconductor manufacturing techniques to produce a large aperture, flat metalens. It was used as the objective lens in a simple telescope. The telescope achieved resolving power superior to refractive and reflective optics and produced clear images of the surface of the Moon2. Though metalenses are a promising advance in scaling down the size of optical systems, there are challenges, both in their design and preparing them for high volume manufacturing. In this paper, we demonstrate the advantage of a manufacturing aware design flow that combines advanced technology from optical design and manufacturing processes design software that brings a manufactured metalens closer to the ideal metalens performance. The flow aids the implementation of design rules from and to optical and manufacturing design, allows the designer to shorten the design cycle, and ultimately stives for the target of a first design correct metalens. © 2023 SPIE.

关键词： Telescopes

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Carrier injection via V-defects for efficient green and red GaN LEDs 2

Carrier injection via V-defects for efficient green and red ...

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Advanced materials, biomaterials, and Manufacturing Technologies for security and defence II 2024

作者： Marcinkevičius, Saulius Yapparov, Rinat Tak, Tanay Ewing, Jacob Wu, Feng DenBaars, Steven P. Nakamura, Shuji Speck, James S. Dept. of Applied Physics KTH Royal Institute of Technology AlbaNova University Center Stockholm10691 Sweden Materials Dept. University of California Santa BarbaraCA93106 United States

ISBN: (纸本)9781510681187

Long wavelength InGaN/GaN quantum well (QW) light emitting diodes (LEDs) are essential components of solid-state lighting and displays. However, efficiency of these devices is inferior to that of blue LEDs. To a large degree, this occurs because equilibration of injected holes between multiple QWs of the active region is hindered by the high GaN quantum confinement and polarization barriers. This drawback could be overcome by lateral hole injection via semipolar QWs present on facets of V-defects that form at threading dislocations in polar GaN-based structures. In this work we have tested the viability of this injection mechanism and studied its properties by time-resolved and near-field spectroscopy techniques on multiple QW devices. We have found that indeed the hole injection via the V-defects does take place, the mechanism is fast, and the hole spread from the V-defect is substantial making this type of injection feasible for efficient long wavelength GaN LEDs. © 2024 SPIE.

关键词： Gallium nitride

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