Abstract

This study demonstrates a differential absorption lidar (DIAL) for CO2 that integrates both single-photon direct detection and coherent detection. Based on all-fiber 1572 nm wavelength devices, this compact lidar achieves detection of CO2 concentration, wind field, and single photon aerosol backscattering signal. First, by comparing DIAL with VAISALA-GMP343, the concentration deviation between the two devices is less than 5 ppm, proving the accuracy of the DIAL. Second, through the scanning detection experiment in Chaohu Lake, Hefei, not only the CO2 concentration between single-photon detection and coherent detection but also the wind field was obtained, proving the multifunctionality and stability of the DIAL. Benefiting from the advantages of combined the two detection methods, single photon detection offers 3-km CO2 and aerosol backscattering signals; coherent detection offers a 360-m shorter blind zone and wind field. This DIAL can achieve monitoring of CO2 flux and sudden emissions, which can effectively compensate for the shortages of in-situ sensors and spaceborne systems.

Abstract

Eu³⁺ doped lithium aluminum gadolinium borophosphate (Li₂O-Al₂O₃-Gd₂O₃-B₂O₃-P₂O₅) glasses were synthesized using the melt-quenching technique to investigate their optical, photoluminescence, and scintillation properties for red emission applications. The optical absorption spectra revealed strong transitions associated with Eu³⁺ ions, while the photoluminescence spectra demonstrated intense red emission at 612 nm under 394 nm excitation. Energy transfer from Gd³⁺ to Eu³⁺ ions was confirmed through decay time analysis, with efficiency reaching 41.88% at 6.0 mol% Eu₂O₃. Judd-Ofelt (JO) analysis showed Ω₄ > Ω₂ > Ω₆, indicating a rigid glass network. The calculated radiative parameters suggest strong emission characteristics, making these glasses suitable for red laser and display applications. Additionally, X-ray-induced luminescence spectra confirmed scintillation behavior, with the Eu³⁺ doped glass exhibiting 24% relative efficiency compared to the Bi₄Ge₃O₁₂ (BGO) commercial scintillator. These findings highlight the potential of Eu³⁺ doped glasses for use in lighting, display technologies, and X-ray detection systems.

Abstract

Metal halide perovskites have drawn significant attention due to their exceptional optical properties, and recent developments in the field have established them as a primary subject for comprehensive research. Perovskites have been widely applied in optoelectronic devices such as light emitting diodes, solar cells, lasers, and photodetectors due to their favorable optical and electrical characteristics encompassing a narrow emission peak, high optical absorption coefficient, high carrier mobility, and a long carrier diffusion length. Meanwhile, their cost-effective fabrication further contributes to their popularity in these applications. An essential aspect of creating outstanding optoelectronic devices lies in understanding the refractive index, which is crucial because it is related to the reflection, transmission, and trapping of light in perovskite films. Herein, we explore the influence of refractive index on optoelectronic devices and examine the methods employed for light management. This talk provides valuable insights into the realm of perovskite optoelectronic research.

Abstract  

In this study, we presented the fabrication of tinted contact lenses for color blindness, and several issues related to their mechanical properties and toxicity were reported. Gold nanoparticles were integrated into the soft hydrogel material-based contact lenses, thus forming nanocomposite contact lenses targeted for red-green CVD application. Integrating nanomaterials into hydrogels is a prominent research challenge for many healthcare applications, such as bio-sensing, cancer therapy, and bone tissue engineering. In particular, practical contact lenses, functionalized with metallic nanoparticles, are of interest for therapeutics and targeted therapy. Several types of nanoparticles were synthesized, characterized, and incorporated within the pHEMA hydrogel material. The materials were utilized along with a VAT Photopolymerization 3D printer for printing soft contact lenses, and their resulting optical, mechanical, hydration and material properties were assessed. The optical transmission properties of the 3D printed nanocomposite lenses were analogous to those of the commercial CVD glasses, and their water content and wettability properties were better compared to some of the commercially available contact lenses used for cosmetic/vision correction purposes. Hence, this work demonstrates the potential of 3D printing multi-functional and nanocomposite contact lenses for ocular health management and, more generally, color filtering applications.