- 标题
- 摘要
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- 实验方案
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Submicron bubbles/voids formation in the subsurface region of soda-lime glass by single pulse fs laser-induced spallation
摘要： The formation of bubbles near the surface of soda-lime glass induced by single pulse irradiation with Ti: Sapphire laser of a wavelength of 775 nm and 150 fs pulse duration below the laser ablation threshold is reported. The bubbles with a diameter of 0.3 to 3 μm are much smaller than the spot size of ~12 μm and exhibit a semi-spherical surface, an ellipsoidal void and an upper shell thickness of approx. 100 nm. The bubbles are formed in a narrow energy range between bulk glass modification and glass ablation. The bubbles formation is accomplished with some changes of the glass morphology around the bubbles. Damaged bubbles occur near the upper laser energy limit for bubbles formation that show nanoholes or slits in the bubbles shell and opened shells exposing the bottom of the void. It is suggested, that the bubble forming mechanism is related to nonlinear processes of laser photon absorption, laser-induced spallation processes, materials heating after electron relaxation, and thermal driven, viscoplastic-mechanical processes. Mainly the material composition gradient of the soda-lime glass near the surface that affects photon absorption, melting, ablation and material expansion processes enable the formation of these bubbles. The void inside the bubble is formed first by pre-spallation resulting in a detached layer that is lifted further forming the bubbles shell by subsurface laser ablation/evaporation processes of the bulk glass. The upper shell of the bubble is formed by a thermally stable crust of corroded soda-lime glass. The results may have valuable impact to laser ablation processes for high precision fabrication. Further, the fast fabrication of such 3D submicron structures due to the single pulse interaction with the glass enables new technical processes for potential applications in sensing, photonic or microfluidic.
关键词： soda-lime glass,surface modification,single pulse,nonlinear absorption,femtosecond laser,bubble,spallation
更新于2025-09-19 17:13:59
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Synthesis of Perovskite CsPbBr <sub/>3</sub> Quantum Dot Superlattice in Borosilicate Glass
摘要： We for the first-time synthesised perovskite CsPbBr3 quantum dot (QD) superlattices in borosilicate glass, which shows a key role in controllable network structure connectivity. The structural and optical properties of CsPbBr3 QD superlattices embedded in the borosilicate glasses were investigated.
关键词： quantum dot,superlattice,borosilicate glass,perovskite,superfluorescence
更新于2025-09-19 17:13:59
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Characterisation of spectroscopic and magneto-optical faraday rotation in Mn2+- doped CdS quantum dots in a silicate glass
摘要： We demonstrate the control of CdS and Mn2+-doped-CdS Q-dots in a silicate glass for magneto-optical applications. The microstructural properties of Q-dot glasses were investigated by X-Ray diffraction (XRD), Field Emission Transmission Electron Microscopy (FETEM) and the optical properties by UV-Visible-NIR and Photoluminescence (PL) spectroscopic techniques, respectively. The FETEM of the CdS QD–glass heat treated at 600oC reveals that the size of CdS and Mn2+-doped CdS Q-dots are in the range of 4-5 nm and 5-6nm, respectively. The observed size distributions of Q-dots were in reasonable agreement with the data, derived from X-ray line broadening and estimated average Bohr radii using the UV-visible absorption data. Photoluminescence characteristics were investigated at room temperature by exciting the CdS and Mn2+-doped-CdS Q-dot glasses with a 420 nm excitation source, which yielded broad emission spectra in the visible and near-IR range (450-800nm). We observed a red shift in the emission peak with increase in the Q-dot size, controlled by heat treatment temperature range (550-600oC). The room-temperature magneto-optical Faraday rotation measurements on Q-dots glasses were carried out using magnetic field strength up to 360 mT, and observed an increase in the value of Verdet constant, from 6.2 to 12.0 degree/T-cm, when comparing undoped CdS-Q-dot glass with Mn2+-doped CdS glass. The demonstration of enhanced Verdet constant in Q-dot silicate glasses with sub-Tesla field paves the path for engineering range magneto-optical devices for photonics, spintronics and sensors applications, in which the polarisation of photons may be controlled with low-intensity magnetic field in optical waveguides.
关键词： Faraday rotation,Quantum dots CdS,Photoluminescence,Dichalcogenide glass,Magneto-optics
更新于2025-09-19 17:13:59
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Milliwatt-Level Spontaneous Emission Across the 3.5a??8 ?μm Spectral Region from Pr3+ Doped Selenide Chalcogenide Fiber Pumped with a Laser Diode
摘要： A spontaneous emission fiber source operating in the mid-infrared (MIR) wavelength range from 3.5 to 8 μm is demonstrated for the first time at output power levels of at least 1 mW. The source is a Pr3+-doped selenide chalcogenide, multimode, glass fiber pumped with commercially available laser diodes operating at 1.470 μm, 1.511 μm and 1.690 μm. This MIR spontaneous emission fiber source offers a viable alternative to broadband mid-infrared supercontinuum fiber sources, which are comparatively complex and costly. The MIR emission wavelength range is significant for molecular sensing applications across biology and chemistry, and in medicine, agriculture, defense, and environmental monitoring.
关键词： mid-infrared,mid-infrared light sources,fiber lasers,chalcogenide glass fibers
更新于2025-09-19 17:13:59
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Coordinate-free Formulation and Evaluation of Tensor Greena??s Functions for General Homogeneous Uniaxial Anisotropic Media
摘要： Stained glass windows are designed to reveal their powerful artistry under diverse and time-varying lighting conditions; virtual relighting of stained glass, therefore, represents an exceptional tool for the appreciation of this age old art form. However, as opposed to most other artifacts, stained glass windows are extremely difficult if not impossible to analyze using controlled illumination because of their size and position. In this paper, we present novel methods built upon image based priors to perform virtual relighting of stained glass artwork by acquiring the actual light transport properties of a given artifact. In a preprocessing step, we build a material-dependent dictionary for light transport by studying the scattering properties of glass samples in a laboratory setup. We can now use the dictionary to recover a light transport matrix in two ways: under controlled illuminations the dictionary constitutes a sparsifying basis for a compressive sensing acquisition, while in the case of uncontrolled illuminations the dictionary is used to perform sparse regularization. The proposed basis preserves volume impurities and we show that the retrieved light transport matrix is heterogeneous, as in the case of real world objects. We present the rendering results of several stained glass artifacts, including the Rose Window of the Cathedral of Lausanne, digitized using the presented methods.
关键词： light transport,recovery,dictionary learning,Banded matrices,stained glass,sparse cultural artifacts,computational relighting
更新于2025-09-19 17:13:59
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P‐9.14: High transparent Active matrix Mini‐LED Full Color Display with IGZO TFT Backplane
摘要： In this paper, we presented a active matrix Mini LED full color display with high transmittance over 60%. A 8-inch display with RGB Mini-LED with IGZO TFT backplane was demonstrated, which is 46 PPI pixel resolution and 256 grayscales and the pixel pitch is less than 0.55mm. It is the first time to realized the full color display based on RGB Mini-LEDs and chip on glass with top gate structure IGZO TFT backplane. We believe that it is a good breakthrough and demonstration for developing large-size Micro LED backplane and displays.
关键词： High transparent,Full Color,IGZO Glass Backplane,Active Matrix,Transparent,Active matrix,Micro LED,RGB Mini-LED Chip
更新于2025-09-19 17:13:59
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Nanocrystalline structure control and tunable luminescent mechanism of Eu-doped CsPbBr3 quantum dots glass for WLED
摘要： As CsPbX3(Cl, Br, I) perovskite quantum dot glass has been widely reported, the discovery of next-generation perovskite luminescent materials has been challenged by doping rare earth activators with energy-level transition. In this work, we report a novel Eu-doped quantum dots glass material with tunable luminescence properties. The structure characteristic and tunable luminescent mechanism were investigated by combining X-ray diffraction, X-ray photoelectric spectroscopy, excitation and emission spectra. It is found that Eu ions replaced the lattice of Pb in CsPbBr3 quantum dots and formed CsEuBr3 quantum dots, which result in a blue emission. Meanwhile, a green emission comes from CsPbBr3 quantum dots, and a red emission originally comes from Eu3+ in glass matrix can also be observed by controlling the heat treatment temperature. A light-emitting diode is designed based on the prepared Eu doped quantum dots glass without doping any phosphors, and a warm-light with CCT at 4075k is obtained. The present work provides a new luminescence tunable design principle of europium doped quantum dots glass materials and could bring inspiration to the future exploration of rare earth ion-doped quantum dot glass material in the future.
关键词： WLED,CsEuBr3,tunable luminescence,Eu-doped,CsPbBr3,perovskite quantum dot glass
更新于2025-09-19 17:13:59
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B36 Laser machining of glass
摘要： We present a numerical and experimental study on the microdrilling of glass with UV laser pulses with the repetition rates from 1 kHz to 20 kHz. Pulse repetition frequency dependency on ablation threshold at the surface of the glass was discussed experimentally and numerically. It was confirmed that the pulse repetition rate influenced heat accumulation and temperature of illuminated area changed.
关键词： heat accumulation,glass,Laser machining
更新于2025-09-19 17:13:59
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Eu2+ and Mn2+ co-doped oxyfluoride glass ceramic for white color conversion of 400??nm UV-LED
摘要： SiO2–Na2O–Al2O3–LaF3 glasses doped with Eu2t and Mn2t were synthesized to fabricate an inorganic color converter for white LED. When Eu2t was formed within the glass matrix, the obtained glasses showed cyan emission under 400 nm excitation upon heat treatment and the emission peak has been shifted with the crystallization. White emission has been successfully achieved with the introduction of Mn2t which supplemented red emission. The glass ceramic has been mounted on a 400 nm UV-LED and successfully demonstrated its practical feasibility with color rendering index of 91.3. The effect of heat treatment and energy transfer between Eu2t and Mn2t has been discussed.
关键词： Mn2t,Eu2t,Oxyfluoride,Glass ceramic,LED
更新于2025-09-19 17:13:59
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Glass rod-sliding and low pressure assisted solution processing composition engineering for high-efficiency perovskite solar cells
摘要： High-efficiency perovskite solar cells (PSCs) have experienced rapid development and attracted significant attention in recent years. The PSCs based on doctor bladed or slot-die coated perovskite films usually have lower power conversion efficiency (PCE) than that based on spin-coated perovskite films. In this work, we have developed an effective method, called glass rod-sliding and low pressure assisted solution processing composition engineering (GRS-LPASP), to manufacture high quality perovskite film in air. GRS-LPASP composition engineering effectively increases the grain size and thickness of perovskite films and reduces the defect density by increasing the contact area between the perovskite layer and the hole transport layer, thus leading an increased current density (Jsc) of perovskite solar cells. The device with GRS-LPASP composition engineering achieves a maximum PCE of 19.78%. The experimental results demonstrates that GRS-LPASP composition engineering is a feasible method to prepare high-efficiency PSCs. Moreover, GRS-LPASP composition engineering also provides a potential approach for the commercial production of PSCs.
关键词： Low pressure assisted method,Glass rod-sliding,Perovskite film,Perovskite solar cell
更新于2025-09-19 17:13:59