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Plasmonic Nanolenses Produced by Cylindrical Vector Beam Printing for Sensing Applications
摘要： Interaction of complex-shaped light fields with specially designed plasmonic nanostructures gives rise to various intriguing optical phenomena like nanofocusing of surface waves, enhanced nonlinear optical response and appearance of specific low-loss modes, which can not be excited with ordinary Gaussian-shaped beams. Related complex-shaped nanostructures are commonly fabricated using rather expensive and time-consuming electron- and ion-beam lithography techniques limiting real-life applicability of such an approach. In this respect, plasmonic nanostructures designed to benefit from their excitation with complex-shaped light fields, as well as high-performing techniques allowing inexpensive and flexible fabrication of such structures, are of great demand for various applications. Here, we demonstrate a simple direct maskless laser-based approach for fabrication of back-reflector-coupled plasmonic nanorings arrays. The approach is based on delicate ablation of an upper metal film of a metal-insulator-metal (MIM) sandwich with donut-shaped laser pulses followed by argon ion-beam polishing. After being excited with a radially polarized beam, the MIM configuration of the nanorings permitted to realize efficient nanofocusing of constructively interfering plasmonic waves excited in the gap area between the nanoring and back-reflector mirror. For optimized MIM geometry excited by radially polarized CVB, substantial enhancement of the electromagnetic near-fields at the center of the ring within a single focal spot with the size of 0.37λ2 can be achieved, which is confirmed by Finite Difference Time Domain calculations, as well as by detection of 100-fold enhanced photoluminescent signal from adsorbed organic dye molecules. Simple large-scale and cost-efficient fabrication procedure offering also a freedom in the choice of materials to design MIM structures, along with remarkable optical and plasmonic characteristics of the produced structures make them promising for realization of various nanophotonic and biosensing platforms that utilize cylindrical vector beam as a pump source.
关键词： plasmonic nanostructures,cylindrical Vector Beam printing,Sensing Applications,nanofocusing,plasmonic nanolenses
更新于2025-09-12 10:27:22
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Laser Irradiation for Improving the Wetting of Nanoparticle Gold Inks for Printed Electronics
摘要： Digital printing technologies such as inkjet or Aerosol Jet are becoming increasingly interesting for the manufacturing of electronic devices. As a maskless and contactless process it offers the potential for low-cost deposition of functional materials onto flat, flexible or 3D-substrates. Common inks used for printed electronics are nanoparticle metal inks. Silver (Ag) is widely used because of its excellent conductivity, but also gold (Au) inks are of interest for several applications. By using nanoparticle inks it is possible to integrate conductive paths and sensors onto temperature sensitive substrate materials such as polymers. Polymers often need a pretreatment like a plasma treatment for improving the wetting. Plasma treatment usually changes the wetting behavior of the complete substrate surface. This could be critical for some applications, e.g. fluidic applications, where the original properties of the substrate should be kept. Low pressure plasma as a vacuum process is also difficult for implementation into an existing process. In this work laser irradiation for local improvement of wetting of an inkjet-printed gold ink on polymer substrates is investigated. The experiments show that laser irradiation is a very promising technique for the modification of polymer surfaces and suitable for inkjet printing nanoparticle inks on hydrophobic polymer surfaces. This offers new opportunities for printed electronics, which could be easily integrated into existing processes.
关键词： laser pretreatment,wetting,gold ink,inkjet printing
更新于2025-09-12 10:27:22
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AIP Conference Proceedings [AIP Publishing INTERNATIONAL SYMPOSIUM ON GREEN AND SUSTAINABLE TECHNOLOGY (ISGST2019) - Perak, Malaysia (23–26 April 2019)] INTERNATIONAL SYMPOSIUM ON GREEN AND SUSTAINABLE TECHNOLOGY (ISGST2019) - Metallization contributions, requirements, and effects related to pattern transfer printing (PTP?) on crystalline silicon solar cells
摘要： In this work, the metallization requirements and development for an alternative fine line printing method to screen printing, called pattern transfer printing (PTP?), are discussed. This technique has been proven in high volume environments and shows impressive capability of printing lines down to 20μm consistently and reliably. With such a major reduction (nearly 50%) in contact area and paste volume, there are some critical aspects of the metallization paste that must be addressed. After these modifications have been made, an efficiency gain of 0.14%abs is demonstrated for the PTP? process versus that of a state-of-the-art screen-printed paste on an industrial scale under otherwise identical conditions.
关键词： PTP?,metallization,crystalline silicon solar cells,pattern transfer printing,efficiency gain
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Micro-Transfer-Printed III-V-on-Silicon C-Band Distributed Bragg Reflector Laser
摘要： We demonstrate a micro-transfer-printed III-V-on-silicon distributed Bragg re?ector (DBR) laser using pre-processed III-V semiconductor optical ampli?ers (SOAs). A waveguide-coupled output power of 6 mW is obtained at 1565 nm.
关键词： micro-transfer-printing,lasers,III-V-on-silicon heterogeneous integration
更新于2025-09-12 10:27:22
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Lasing characteristics of a pyrromethene597-doped microdisk laser fabricated by the ink-jet printing method
摘要： A microdisk laser based on the fluorinated hyper branched polymer FC-V-50 was fabricated on an FEP (fluorinated ethylene propylene) substrate with the use of the ink-jet printing method. Pyrromethene597 doped 10 wt.% FC-V-50 solution in ethanol was used for the fabrication of a microdisk laser. The FC-V-50 polymer is characterized by a carboxyl functional group, which can be activated and attached to an amine group found in biomolecules. Based on the lasing characteristics, it is found that the microdisk laser has a relatively low lasing threshold of 34.51 μJ mm?2 and a reasonable Q factor of 7.52 × 103 at 586.59 nm. Therefore, the microdisk can be used for biosensing. The root mean square (RMS) of the surface roughness of the microdisk was estimated to be 6.2 nm. The surface roughness results scattering losses and limits the Q factor. This work reports the first demonstration of a microdisk laser based on FC-V-50 for biosensing applications.
关键词： ink-jet printing,microdisk laser,pyrromethene597,biosensing,FC-V-50
更新于2025-09-11 14:15:04
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Accelerating the Screening of Perovskite Compositions for Photovoltaic Applications through High‐Throughput Inkjet Printing
摘要： The exploration and optimization of numerous mixed perovskite compositions are causing a strong demand for high-throughput synthesis. Nevertheless high-throughput fabrication of perovskite films with representative film properties, which can efficiently screen the perovskite compositions for photovoltaic applications, has rarely been explored. A high-throughput inkjet printing approach that can automatically fabricate perovskite films with various compositions with high reproducibility and high speed is developed. The automatic sequential printing of four precursors forms 25 mixed films in a fast and reproducible manner. The obtained bandgaps, photoluminescence (PL) peak positions, and PL lifetimes allow for the efficient screening of perovskite compositions for photovoltaic applications. To exemplify this concept, among 25 tested films, two compositions CH3NH3PbBr0.75I2.25 (MA) and (HC(NH2)2)0.75(CH3NH3)0.25PbBr0.75I2.25 (FA0.75MA0.25) with a long (237 ns) and short (49.0 ns) PL lifetime, respectively, are screened out for device investigations. As expected, the MA-based device exhibits a much higher efficiency (19.0%) than that (15.3%) of the FA0.75MA0.25 counterpart. This efficiency improvement is mainly ascribed to a smaller dark saturate current density, a lower level of energetic disorder, more efficient charge transfer and decreased charge recombination losses, which are consistent with the much longer PL lifetime in the database.
关键词： perovskites,photovoltaic applications,inkjet printing,high throughput fabrication
更新于2025-09-11 14:15:04
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P‐6.8: Study of Mass Transfer for Micro‐LED Manufacturing
摘要： Micro-LED is superior to LCD and OLED in terms of power consumption, light efficiency, contrast, response time, reliability, color gamut, lifetime, resolution and viewing angle, it is regarded as the most promising display technology in next generation. However, there are still many technical bottlenecks that hinder the development of Micro-LED display. One of the most important technical issues is mass transfer. Mass transfer is a technology aim to transferring millions or even tens of millions of Micro-LED pixels which grown on sapphire substrates to the glass substrates required for display devices quickly and correctly and providing good electrical and mechanical connections between the Micro-LED pixels and the drive circuits. There have been many companies that have been working to solve this problem and have come up with solutions from different technical aspects. In this paper, we will review several different technologies, classify them from the technical type, evaluate the maturity and achievability of the technology, and analyze the application fields of different technologies.
关键词： magnetic Stamp,fluidic assembly,static electricity,Van der Waals force,laser release,Mass transfer,roll printing,Micro-LED
更新于2025-09-11 14:15:04
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Print flexible solar cells
摘要： Conventional silicon solar cells account for more than 90% of global production, yet making them uses energy equivalent to about 10% of their lifetime output. The future of solar energy depends on a union of new and old technologies. If photovoltaic (PV) devices that turn light into electricity could be mass produced with printing presses, as if they were newspapers or banknotes, they could be affordable and ubiquitous. Conventional, silicon-based, solar panels are rigid and bulky. Small, thin and flexible PV devices on films are already being made that are lightweight and translucent. These use little material and can generate electricity in low light, even indoors. Integrating them into phones and watches, as well as walls and windows, would transform the world’s energy generation, reduce pollution and mitigate climate change.
关键词： photovoltaic devices,solar cells,printing technology,flexible solar panels,renewable energy
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Stitch-Free Fabrication of Microoptical Elements Employing Femtosecond Laser 3D Lithography
摘要： Microoptics is a fast expanding field showing huge potential in providing science and industry with small yet highly functional tools for light control at a micro-scale. One of the most promising technologies to produce such elements is 3D laser lithography (3DLL) as it enables fabrication of free-form 3D objects with resolution and surface roughness control down to nm level. Despite current progress there is still some limitations concerning microoptical element printing. In this work we present an approach of synchronizing linear stages and galvo-scanners for rapid (up to several mm/s translation velocity) and stitch-free printing of functional microoptics with the optical grade surface finish and overall size up to several mm. These include mm sized refractive microlenses, Fresnel lenses, microprisms and opaque apertures. All these elements are produced in a single printing step showing the potency of 3DLL as a straight-forward and relatively simple technology to produce microoptics at these sizes. Quality and functionality of these elements are investigated in qualitative and quantitative fashions. Outlook on challenges occurring while working in this size scale is provided, possible solutions to tackle them are proposed.
关键词： 3D laser lithography,linear stages,stitch-free printing,Microoptics,galvo-scanners
更新于2025-09-11 14:15:04
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[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Photonic Bandgap Bragg Waveguide-based Terahertz Microfluidic Sensor
摘要： A 3D printed photonic bandgap Bragg waveguide-based resonant fluidic sensor operating in the THz spectral range is theoretical analyzed and experimental studied. The liquid analytes injected into a microfluidic channel inside the reflector region result in anticrossing of the dispersion relation between the core-guided mode and the defect state. By tracking the spectral positions of the induced absorption dips and phase changes on the transmission spectra, the fluidic sensor exhibits a sensitivity of 110 GHz/RIU and a resolution of 0.0045 RIU. The sensor provides a non-contact measurement method for real-time monitoring of the refractive index change of liquid flow in practical applications.
关键词： 3D Printing,Photonic Bandgap,Microfluidic Sensor,Bragg Waveguide,Terahertz
更新于2025-09-11 14:15:04