- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Development of a Monitoring Strategy for Laser-Textured Metallic Surfaces Using a Diffractive Approach
摘要： The current status of research around the world concurs on the powerful influence of micro- and nano-textured surfaces in terms of surface functionalization. In order to characterize the manufactured topographical morphology with regard to the surface quality or homogeneity, major efforts are still required. In this work, an optical approach for the indirect evaluation of the quality and morphology of surface structures manufactured with Direct Laser Interference Patterning (DLIP) is presented. For testing the designed optical configuration, line-like surface patterns are fabricated at a 1064 nm wavelength on stainless steel with a repetitive distance of 4.9 μm, utilizing a two-beam DLIP configuration. Depending on the pulse to pulse overlap and hatch distance, different single and complex pattern geometries are produced, presenting non-homogenous and homogenous surface patterns. The developed optical system permitted the successfully classification of different pattern geometries, in particular, those showing single-scale morphology (high homogeneity). Additionally, the fabricated structures were measured using confocal microscopy method, and the obtained topographies were correlated with the recorded optical images.
关键词： homogeneity characterization,periodic structures,diffraction analysis,direct laser interference patterning,indirect surface characterization
更新于2025-09-16 10:30:52
-
[IEEE 2019 IEEE International Conference on Sensors and Nanotechnology (SENSORS & NANO) - Penang, Malaysia (2019.7.24-2019.7.25)] 2019 IEEE International Conference on Sensors and Nanotechnology - Optimization of CO <sub/>2</sub> Laser Power for Patterning of Single-layer Graphene for Advanced Devices Applications
摘要： Transparent conductive films (TCFs) made of graphene and its composite materials have emerged as potential electrodes for advanced devices such as sensors, light emitting diodes (LEDs), organic LEDs, solar cells and supercapacitors. The TCFs need to be patterned to make their use in these devices. In this work, the patterning of such TCF is carried out by CO2 laser. Different laser power levels are optimized for effective patterning of single-layer graphene film transferred to the transparent substrates such as microscopic glass slides and polyethylene terephthalate (PET). Moreover, the effect of different laser power levels on the electrical property of graphene TCFs before and after patterning is also examined. It is found that the patterned graphene TCFs are free from film narrowing, wrapping, and bundle formation at different power levels. It is also found that the sheet resistance of patterned graphene film remains the same after CO2 laser-based ablation process. The optimized conditions of CO2 laser-based patterning offer a facile, fast, and time-saving technique to pattern the single layer graphene.
关键词： laser,patterning,thin film,graphene,TCF
更新于2025-09-16 10:30:52
-
[Laser Institute of America ICALEO? 2014: 33rd International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing - San Diego, California, USA (October 19–23, 2014)] International Congress on Applications of Lasers & Electro-Optics - ITO patterning using advanced green and infrared pulsed fiber lasers
摘要： Laser patterning of Indium Tin Oxide (ITO) deposited on bulk substrates enables a chemical waste free, high throughput process that is widely used in flat panel and touch panel display devices. To attain economic viability and meet the need for narrow touch sensor borders with high quality ITO patterning, the width, uniformity, and throughput of the scribing lines are key quality parameters. In this talk we report on the advances in pulsed nanosecond fiber lasers at wavelengths of 532 and 1064-nm with optimized parameters for meeting theses critical requirements. Specifically, near diffraction-limited beam quality, high peak power capabilities, short pulses, and fast transient response are necessary to produce consistent scribed lines in the order of 10?m in width with smooth edges. The results of our study demonstrate the advantage of using the IR laser as a robust, cost-effective solution for scribing lines with a width in between 15-25?m. However, the ability to focus the beam of the green laser more tightly makes it the preferred candidate for meeting the 10?m width target.
关键词： 1064nm,PRF,532nm,nanosecond,ITO patterning,peak power,pulse duration,fiber lasers,beam quality
更新于2025-09-16 10:30:52
-
Controlled patterning of upconversion nanocrystals through capillary force
摘要： Lanthanide-doped upconversion nanoparticles (UCNPs) can absorb near-infrared photons and convert them into visible and ultraviolet emissions. These nanomaterials possess extraordinary optical performance and hold potential as active platforms for a variety of technological applications. The ability to fabricate highly ordered nanoparticle-based photonic elements over a large area is of fundamental significance for luminescence tuning. Despite all the efforts made, however, large-area spatial patterning of UCNPs into ordered arrays with high controllability remains a challenge. In this study, we report a high-throughput strategy to pattern optical nanomaterials through the use of polymer microspheres and templated assembly of UCNPs. This technique utilizes capillary force to drive hybrid clusters into the physical template, resulting in large-area, spatially ordered arrays of particles. The findings reported in this work may promote the development of novel nonlinear optical devices, such as solid-state laser arrays, high-density optical storage, and anti-counterfeiting labels.
关键词： self-assembly,rare earths,patterning,upconversion nanoparticles
更新于2025-09-16 10:30:52
-
Three-Dimensional Laser-Assisted Patterning of Blue-Emissive Metal Halide Perovskite Nanocrystals inside a Glass with Switchable Photoluminescence
摘要： The high-precision patterning of metal halide perovskites (MHPs) is of paramount importance for their device application. Here, we demonstrate the femtosecond (fs)-laser-assisted formation of three-dimensional MHP nanocrystal (NC) patterns with strong blue photoluminescence (PL) inside an oxide glass. Our strategy enables the crystallization and erasing of CsPb(Cl/Br)3 NCs inside a glass localized around the laser focal area through a combination of fs laser irradiation and thermal treatment processes. These recoverable patterns exhibit a switchable PL associated with the laser-induced defect and the thermal healing of MHP NCs that are benefits from the soft ionic crystal structure and low formation energy of the MHPs. Due to the high stability offered by the protection of the oxide glass matrix, the laser printing of fine-structured MHP micropatterns can be repeated over multiple cycles with a high robustness compared with their colloidal process counterparts. Our results demonstrate a simple strategy for creating emissive patterns inside a stable and transparent solid matrix that could be promising for applications including information storage, three-dimensional displays, anticounterfeit labels, and information security protection.
关键词： three-dimensional patterning,perovskite nanocrystals,reversible photoluminescence,laser-assisted crystallization,femtosecond laser processing
更新于2025-09-16 10:30:52
-
Design Principle of Reactive Components for Dimethacrylatea??Terminated Quantum Dots: Preserved Photoluminescent Quantum Yield, Excellent Pattern Uniformity, and Suppression of Aggregation in the Matrix
摘要： With the advent of various quantum dot (QD)-based application technologies, the demand for low-cost, eco-friendly, high-performance nanocomposites (e.g., QD photoresist) is rapidly increasing. However, the aggregation phenomenon due to incompatibility between QDs and components is still a limitation in industrial use. Herein, the principle of selecting reactive components that inhibit aggregation and preserve photoluminescent properties is presented. For model QDs (bis[2-(methacryloyloxy)ethyl] phosphate/1-dodecanethiol [BMEP/DDT] capped QDs), BMEP allows copolymerization and coadded DDT minimizes the loss of absolute quantum yield during ligand exchange. Besides, bisphenol A ethoxylate dimethacrylate (Mn: ≈1700, polyethylene oxide) suppresses aggregation in the matrix and provide high solubility in alkaline solution. More specifically, the coated thin film (1.0 μm thick) containing up to 20.0 wt% QDs exhibits not only transmittance of more than 85% at 550 nm, but also excellent pattern uniformity at high resolution.
关键词： photoresists,direct patterning,reactive monomers,quantum dots
更新于2025-09-16 10:30:52
-
Morphologically modulated laser-patterned reduced graphene oxide strain sensors for human fatigue recognition
摘要： Laser heating provides an effective method to produce thermally reduced graphene oxide (rGO), it can also pattern the designed layout on the surface of graphene oxide (GO) during the reduction process. In this work, we demonstrated a flexible strain sensor based on the morphologically modulated laser-patterned reduced graphene oxide (LPG) film with a one-step process. Compared with the strain sensor using flat patterned rGO (0-1.2%) and curved-grid patterned rGO (CGPG) (0-4.1%), the strain sensor based on rectangular-grid patterned rGO (RGPG) have highest gauge factor (GF), up to 133 under 2.7% of physical deformation. Meanwhile, the RGPG strain sensors exhibit extraordinary linearity in a relatively large range of deformation (0-2.7%) and excellent endurance for over 1000 stretching-releasing circles. The RGPG strain sensor was used to monitor human fatigue. By analyzing eye blinking frequency and duration, it is possible to evaluate the fatigue level. We anticipate that the RGPG based strain sensor, prepared via a relatively simple and cost-effective process, may open up a broad spectrum of practical applications, such as driver fatigue evaluation and smart monitoring of human body movements.
关键词： wearable electronics,laser patterning,fatigue evaluation,flexible strain sensor,reduced graphene oxide
更新于2025-09-12 10:27:22
-
Towards High Throughput Texturing of Polymer Foils for Enhanced Light Trapping in Flexible Perovskite Solar Cells using Roll‐to‐roll Hot Embossing
摘要： In this work, a high throughput method is presented to texture polymer foils by roll-to-roll hot embossing with the objective of increasing the substrate haze factor. Triple cation perovskite solar cells were deposited onto these structured substrate showing an efficiency increase up to 15 % (relative) compared to the reference flat device, due to an enhanced light absorption.
关键词： flexible optoelectronics,perovskite solar cells,roll-to-roll hot embossing,direct laser interference patterning,light trapping
更新于2025-09-12 10:27:22
-
Direct Laser Patterning and Phase Transformation of 2D PdSe <sub/>2</sub> Films for On-Demand Device Fabrication
摘要： Heterophase homojunction formation in atomically thin 2D layers is of great importance for next-generation nanoelectronics and optoelectronics applications. Technologically challenging, controllable transformation between the semiconducting and metallic phases of transition metal chalcogenides is of particular importance. Here, we demonstrate that controlled laser irradiation can be used to directly ablate PdSe2 thin films using high power or trigger the local transformation of PdSe2 into a metallic phase PdSe2?x using lower laser power. Such transformations are possible due to the low decomposition temperature of PdSe2 and a variety of stable phases compared to other 2D transition metal dichalcogenides. Scanning transmission electron microscopy is used to reveal the laser-induced Se-deficient phases of PdSe2 material. The process sensitivity to the laser power allows patterning flexibility for resist-free device fabrication. The laser-patterned devices demonstrate that a laser-induced metallic phase PdSe2?x is stable with increased conductivity by a factor of about 20 compared to PdSe2. These findings contribute to the development of nanoscale devices with homojunctions and scalable methods to achieve structural transformations in 2D materials.
关键词： device fabrication,phase transformation,PdSe2,FET,laser patterning,2D materials,graphene
更新于2025-09-12 10:27:22
-
Microstructural and Metallurgical Assessment of the Laser-Patterned Cemented Tungsten Carbide (WC-CoNi)
摘要： Cemented carbide is difficult to machine using traditional chip-removal methods due to its hardness. Electrical discharge machining (EDM) is the common method applied to shape cemented carbides because high geometric precision can be achieved. However, some important defects (pores, residual stresses or oxidation products) can be induced due to thermal reactions. Ultra-short pulse laser processing can also provide high precision and meanwhile effectively avoid these defects due to its short laser-matter reaction time. In this paper, three different patterns on WC-CoNi cemented carbides for tribological purposes, namely line-like patterns, dimples and grooves, have been created using different laser set-ups with pulse duration in the range of nanoseconds (10-9s), picoseconds (10-12s) and femtoseconds (10-15s). Microstructural and metallurgical changes of modified surfaces have been studied. Laser scanning microscopy (LSM) is conducted to measure the pattern dimensions. Focused ion beam (FIB) in combination with scanning electron microscope (SEM) is used to investigate the microstructural changes of the patterned materials.
关键词： Surface integrity,Laser surface patterning (LST),Cemented carbide,Ultra-short pulse laser processing
更新于2025-09-12 10:27:22