Researchers have developed a lead-free ultra-broadband LED using lanthanide-doped double perovskites, offering improved stability and cost-effectiveness. The device shows promising applications in spectroscopic analysis and multifunctional lighting, outperforming previously reported ultrabroadband light sources.
The holo-imprinting method overcomes the mass production bottleneck of traditional holographic optical elements. It uses photoalignment and reflective planar LC optics to record high-quality linear polarization fields. The technique has been experimentally validated with samples exhibiting excellent optical quality.
A team of scientists has reported new research progress on the photoluminescence (PL) mechanism of carbonized polymer dots (CPDs), uncovering the essential roles of spatial effects within confined domains. The study reveals tunable PL performance through varying degrees of steric hindrance.
Researchers from Italy, USA and Australia demonstrate a new approach to ultrafast spectroscopy using noisy pulses to retrieve phononic states in materials. The technique uses correlations induced through nonlinear interaction of light with the material.
Researchers developed a two-wavelength holographic system to measure the topography of metal melt pools during laser beam melting. The system successfully captured 3D shape dynamics, including key-hole regime instabilities and oscillations between modes.
A new deep learning approach, dynamic synthesis network (DSN), enables high-quality imaging through complex scattering media. DSN adapts to different scattering conditions by dynamically adjusting model weights and removing artifacts.
A review of digital holography (DH) for measuring and characterizing soft matter structures reveals its strong ability to characterize films and dynamic processes. DH enables accurate and high-precision measurements in various applications, including inkjet printing, additive manufacturing, and advanced fabrication techniques.
A research team developed hybrid photoreceptors that mimic the retina's rod cells, enabling efficient artificial retina networks. The photoreceptors exhibit excellent optoelectronic properties, including high capacitance and charging & discharging efficiencies.
A new review introduces methods of photonic matrix multiplication, which offers great potential for photonic acceleration in AI applications. The technology has advantages in signal rate, latency, power consumption, and computing density over electrical computing.
A Chinese satellite monitored a significant decrease in nitrogen dioxide emissions globally during the COVID-19 pandemic, with some cities experiencing sharp reductions after lockdown measures were implemented. The study also found decreases in formaldehyde and increases in volatile organic compounds in some regions.
Researchers created a spatial and nonlinear encryption method for images using photorefractive crystals, increasing security in documents, currency, and credit cards. The method is immune to traditional phase-retrieval-based known-plaintext attacks and robust against machine learning-based cracking due to its image-dependence.
Researchers have discovered a new class of chirp-free pulse in normal-dispersion fiber lasers, termed as birefringence-managed soliton. This pulse is formed through the interaction between polarization-maintaining fiber and the laser cavity, resulting in a unique vector soliton with near-chirp-free properties.
Researchers review resolution enhancement approaches for digital holographic microscopy, including illumination modulation techniques and holographic recording enhancements. They also explore the potential of deep learning to improve DHM resolution.
Researchers have developed a nonvolatile approach to modulate interlayer excitons, enabling valleytronics. The method utilizes chemical doping and electrical gating, resulting in retention times exceeding 60 minutes.
Researchers have developed an entirely new paradigm to image objects through diffusive media. A deep learning-based approach uses diffractive surfaces to optically reconstruct distorted images without digital processing. This computer-free method has significant potential for advancements in fields such as biomedical imaging, astronomy...
A team of scientists developed an AI-driven super-resolution technique called Ghost Imaging using Deep neural network Constraint (GIDC) to overcome the diffraction limit in long-distance imaging. GIDC uses single-pixel measurements and a physics-enhanced deep neural network to restore high-quality images.
A new method termed Optical Lock-in Detection Super-resolution Dipole Orientation Mapping (OLID-SDOM) is developed for weak fluorescence anisotropy mapping in live cells. This approach achieves high spatial resolution and speed, allowing for the study of subcellular structures with unprecedented precision.
Physicists have demonstrated experimentally tunable skyrmions in optical systems, offering a new mechanism for transforming between various topological textures. The results show great agreement with theoretical predictions and enable diverse applications in advanced photonics.
Researchers developed novel SnO2 QDs that passivate the buried interface, control crystallization, and provide a favorable electronic and physical interfacial contact. These devices achieved high PCEs and record efficiencies in upscaling blade-coated perovskite systems.
Hyperbolic metamaterials exhibit extremely high anisotropy, enabling unique light manipulation capabilities. Researchers have harmonized HMMs with natural materials and artificial structures, expanding their applicability to fields like super-resolution imaging and emission engineering.
Scientists demonstrated experimental realization of an atom-optically synthetic gauge field in a noninteracting Bose gas of Cs atoms. They observed gauge flux-dependent populations and chiral atomic currents, which are significant for understanding gauge fields in synthetic dimensions.
Researchers successfully fabricate high-aspect-ratio microstructures on silicon surfaces in the ductile regime, demonstrating structural coloration. Polychromatic images are rendered with controllable grating spacings at each pixel location.
Scientists have introduced a new microscope that uses quantum dots to image ultrafast electric waveforms encoded in the visible luminescence of nanocrystal probes. The technique, termed Quantum-Probe Field Microscopy (QFIM), enables the detection of terahertz near-field waveforms by microscopy of visible photons.
Researchers from ShanghaiTech University create a mid-infrared hyperchaos source using interband cascade lasers with optical feedback, enabling secure free-space communication links and remote chaotic Lidar systems. The broadband chaos has a gigahertz frequency coverage, suitable for high-speed information processing and transmission.
Researchers discovered a new type of free-electron radiations, namely surface Dyakonov-Cherenkov radiation, which enhances photon emission and reduces interaction length in miniaturized Cherenkov detectors. The technology offers improved accuracy for detecting particle trajectories.
A team developed a new optical imaging method that can quantify optical properties of strongly turbid media at high-speed (e.g., kHz) capabilities. The halftone spatial frequency domain imaging technique projects sinusoidal light patterns onto the sample and collects reflectance images, increasing the measurement speed by approximately...
Researchers have proposed a new method for controlling the polarization of cylindrical vector beams (CVBs) using a metal-dielectric-metal metasurface. This enables independent modulation of the left- and right-handed circularly polarized components, allowing for efficient multiplexing and demultiplexing of CVBs.
Scientists observe increased ring-like fringes with higher optical-path-difference, outperforming equal-inclination interference. The ASD interference exhibits improved sensitivity and accuracy for measuring small displacements and refractive index changes.
Recent advancements in machine learning and neural networks enable real-time computer-generated holograms, overcoming data transmission challenges. Larger spatial light modulators and improved rendering hardware are also bringing holographic projection systems closer to consumer market.
Researchers developed a new fluorescence lifetime imaging (FLIM) technique to study DNA compaction and gene activities in live cells. The method enables fine measurements of DNA compaction, revealing differences in compaction between gene-rich and gene-poor chromatin domains.
Researchers discover that lipid droplets can be used as endogenous intracellular microlenses to enhance fluorescence imaging in living cells. This technique reduces the required excitation power by up to 73% and enables efficient detection of fluorescent signals from extracellular environments.
Researchers have developed a new laser speckle imaging technique that can monitor blood flow velocity in thick tissue without the need for surgical windows or optical clearing. This non-invasive method uses transmission detection to improve signal-to-background ratio and enables individual-vessel resolution in human subjects.
The article examines the inconsistencies in holography's language and its evolution across diverse communities. The pioneers created a useful and accurate language, but much of it has been lost over time. A layman can describe a hologram as a window that transforms light into a different wave, enabling viewing of a 3D image.
Scientists develop novel trapping method to measure extremely small forces using a hairdryer-balloon setup, detecting femtoNewton-range forces without laser-particle contact. This approach has significant implications for the life sciences and beyond.
Researchers have developed a new method for 3D imaging without distal optics, enabling high-resolution endomicroscopy with diameters below 0.5 millimeters. The approach uses diffractive optical elements to compensate phase distortions in fiber bundles, allowing for robust and low-cost medical imaging.
A new technique using thin-film neural networks (TFNNs) improves processing times for all-optical neural networks and enables fast optimization of photonic devices. The approach accelerates the design and fabrication of multilayer thin films, mimicking human retina cells.
A team of scientists developed a unique technology to measure optical fiber diameter without damaging it, using forward stimulated Brillouin scattering. This allows for accurate measurements up to several kilometers and significantly higher spatial resolution.
Researchers developed a novel PSOCT method, polarization state tracing (PST), to image depth-resolved collagen organization within living tissues without damaging the sample. This allows for accurate clinical diagnosis and image-guided surgery, targeting precision medicine.
Researchers have created a wide-range luminescent thermometer using Pr3+ and YAl3(BO3)4:Pr3+,Gd3+, which offers high precision and low uncertainty in temperature measurement. This thermometer can measure temperatures between 30 K and 800 K with constant relative measurement uncertainty.
Researchers developed a GeSn-on-insulator (GeSnOI) technology for high-performance GeSn lasers, tackling interface defects, strain engineering, thermal management, and optical confinement. This leads to improved laser properties, including lower threshold, higher maximum lasing temperature, and stronger lasing intensity.
A new deep learning-powered approach transforms RCM images into virtually-stained H&E images, enabling the analysis of microscopic skin features without invasive biopsies. This technique, called virtual histology, can diagnose various skin conditions, including basal cell carcinoma and melanocytic nevi.
Scientists design a special metamaterial that achieves 'zero index' with infinite effective spatial wavelength, overcoming limitations of short spatial wavelength in the optical regime. DCZIMs offer advantages over other mechanisms, including no ohmic losses and scalable fabricating using standard planar processes.
Researchers create a novel concept to improve supercontinuum light sources by incorporating nano-films into microstructured fibers. This results in broad and flattened output spectra with low input energy, ideal for applications like optical coherence tomography and field hand-held spectroscopy.
Researchers investigated exciton diffusion behavior in WSe2 monolayer flake under phonon scattering and disorder potentials. Temperature manipulation optimizes the competition between exciton localization and phonon-exciton scattering, leading to improved exciton diffusion coefficient.
A team of scientists has developed a novel method to characterize microscope objectives without an aberration-less reference element, enabling error correction and precise data collection. Using nanoscale dipole scatterers, they create a nearly-perfect reference wave for measurement.
A novel core-shell plasmonic metal nanostructure enhances coupling with perovskite material, effectively filling deep level trap states at grain boundaries. The incorporation of this technology improves photo-generated current and device performance by increasing open circuit voltage and filling factor.
Recent advances in holographic optical elements, surface relief gratings, metasurfaces, and micro-LEDs offer new optical architectures to break the etendue limitation in AR/VR displays. These innovations have led to improved system performance, reduced size, and increased weight tolerance.
Physicists discover skyrmions can fly through electromagnetic pulses with controlled topological complexity. The supertoroidal pulse, a generalization of the 'Flying Doughnut', features fractal-like toroidal structures and multiple singularities.
Researchers have developed a glasses-free 3D display with an unprecedented field of view of 160°, overcoming critical trade-offs in spatial resolution and angular resolution. The display uses a large-scale 2D-metagrating complex to manipulate view distribution and achieve a thin form factor.
Researchers have developed a new multiferroic solar PV device with high photoconversion efficiency and stability. They attribute the improvement to ferroelectric polarization and magnetization regulation mechanisms, which enhance carrier separation and reduce recombination rates.