Abstract
Transparent glass has been identified as a vital medium for three-dimensional (3D) optical information storage and multi-level encryption. However, it has remained a challenge for directly ...writing 3D patterning inside a transparent glass using semiconductor blue laser instead of high-cost femtosecond laser. Here, we demonstrate that rare earth ions doped transparent glass can be used as 3D optical information storage and data encryption medium based on their reversible transmittance and photoluminescence manipulation. The color of tungsten phosphate glass doped with rare earth ions change reversibly from light yellow to blue upon alternating 473 nm laser illumination and temperature stimulation, resulting in the reversible luminescence modulation. The information data could be repeatedly written and erased in arbitrary 3D space of transparent glass, not only showing the ability of the excellent reproducibility and storage capacity, but also opening opportunities in information security. The present work expands the application fields of luminescent glass, and it is conducive to develop a novel 3D data storage and information encryption media.
Square-root topological insulators recently discovered are intriguing topological phases. They possess topological properties inherited from the squared Hamiltonian and exhibit double-band ...structures. The mechanism of the square root was generalized to 2
n
-root topological insulators, giving rise to more band gaps. In this study, we describe the experimental realization of one-dimensional 2
n
-root topological insulators in photonic waveguide arrays using the archetypical Su-Schrieffer-Heeger (SSH) model. Topological edge states with tunable numbers are clearly observed under visible light. In particular, we visualized the dynamic evolutions of the light propagation by varying the sample lengths, which further proved the localization and multiple numbers of edge states in 2
n
-root topological systems. The experiment, which involves constructing 2
n
-root topological photonic lattices in various geometric arrangements, provides a stable platform for studying topological states that exhibit a remarkable degree of flexibility and control.
The snail Bellamya purificata is recognized as a potential bio-remediation species, and is commonly employed in polyculture to enhance resource utilization efficiency and realize culture environment ...regulation. In order to enrich the microbiome studies on elucidating the ecological effects of snail B. purificata farming, we assessed the effect of B. purificata farming activities, at varying stocking densities, on the algal and fungal communities in sediment. Four experimental groups were established in our study, each corresponding to a different stocking density: 0, 234.38, 468.75, and 937.5 g/m2, represented as CON, LD, MD, and HD, respectively. High-throughput sequencing based on ITS and 23S ribosomal RNA (rRNA) genes was employed to analyze the variations in algal and fungal communities under B. purificata farming activities at different stocking densities. B. purificata farming activities had no significant effect on the alpha diversities of fungal and algal communities, but significantly altered the compositions of fungal and algal communities in sediments, especially B. purificata farming activity at low stocking density. B. purificata farming activities at low stocking density could significantly increase the relative abundances of fungal genera Paraconiothyrium and Penicillium compared with the CON group. The promoting effect diminished with increasing density. B. purificata farming activities at low or medium stocking density also could enhance the relative abundances of algal genera Microchloropsis, Scenedesmus, and Auxenochlorella. Hence, B. purificata farming activity at low stocking density might be the optimum density to enhance resource utilization efficiency and minimize environmental pollution.
Fast response, high luminescence contrast, three-dimensional (3D) storage, and nondestructive reading are key factors for the optical storage application of photochromic materials. Femtosecond (fs) ...laser direct writing technology with multiphoton nonlinear absorption is becoming a useful tool for microprocessing functional units in the 3D space of glass owing to its remarkable advantages, such as a fast processing speed and high processing accuracy. Herein, the photochromism of transparent glass codoped with rare-earth ions was investigated under 800-nm fs laser irradiation, affording a fast response. The photochromic glass achieves an upconversion luminescence (UCL) modification of 92%. The photochromic glass can be bleached back to its original color using heat treatment. The transmittance and UCL modification show excellent reproducibility under alternating stimulations between 800-nm fs laser irradiation and heat treatment. The data can be written in the interior of the transparent photochromic glass using 800-nm fs laser irradiation, facilitating 3D information storage. These results suggest that the 800-nm fs laser irradiation-subjected photochromic glass is an ideal optical data storage medium.
The photopolymerization method for fabricating silica glass is a rapid, eco-friendly, and flexible technique. However, silica glass prepared via this method has limited solubility for rare-earth ...ions, making it difficult to achieve laser output with such low luminescence efficiency. Here, Al and P elements are introduced into the silica glass matrix to increase the Yb3+ doping concentration to 1.2 wt%. It is revealed that the fluorescence intensity of the co-doped silica glass is greatly enhanced, making it more suitable as a laser gain material. A porous glass rod co-doped with Al/P/Yb is fabricated based on the above method, subsequently transforming it into a glass microsphere resonator through treatment with a hydrogen-oxygen flame and CO2 laser. By pumping with a tapered optical fiber, the output of multi-mode (1033 nm and 1040 nm) lasers is achieved in whispering gallery modes (WGMs) resonator. This technology offers a simpler and more efficient method for fabricating laser microsphere resonators, which holds promise for applications in the field of integrated optics.
•Silica glass was prepared using rapid, economical, and flexible photopolymerization method.•Al and P doping in silica glass boosts Yb³⁺ to 1.2 wt%, significantly enhancing its fluorescence for laser gains.•Multi-mode (1033, 1040 nm) lasers achieved in WGMs resonator.
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.
Metal halide perovskites (MHPs), as emerging stars, are greatly attracted due to their superior optical and optoelectrical properties. The design and construction of patterned materials have been ...considered as a powerful tool to improve the performance of optical and optoelectronic devices. Therefore, the marriage of MHPs and patterning technologies is expected to boost the development of perovskite‐based applications with novel functions and optimized properties. Moreover, with the merits of patterning technologies, integrated and small‐sized perovskite‐based optoelectronic devices with compactness are foreseen. In this review, recent progress in this field is summarized, including template‐assisted and template‐free patterning technologies that can endow MHPs with high crystallinity, long‐term stability, and special structures. Besides, the advantages and mechanisms of patterned MHPs toward high‐performance applications are discussed.
Metal halide perovskites (MHPs) possess unique optical and optoelectronic properties. Versatile patterning technologies contribute to constructing patterned MHPs with specific structures toward optoelectronic devices with enhanced performance and novel functions. In this progress report, an overview of the patterning technologies performing on MHPs, the merits of patterned MHP‐based devices, as well as the outlook of future developments are discussed.
Abstract
In order to better ensure the effective operation of substation intelligent auxiliary monitoring system, aiming at the problems of slow data transmission speed and poor data processing ...security of current monitoring system, a high-speed data transmission method of the substation intelligent auxiliary monitoring system is proposed. By constructing the data processing platform of substation intelligent auxiliary monitoring system, the data transmission algorithm of auxiliary monitoring system is optimized, reasonably select the optimal path of data transmission and conduct security encryption processing, so as to improve the high-speed data transmission efficiency of substation intelligent auxiliary monitoring system. Finally, the experiment shows that the high-speed data transmission method of the substation intelligent auxiliary monitoring system has higher practicability in the process of practical application and fully meets the research requirements.
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