Researchers from China established a general strategy to guide design of optical metasurfaces with fully controlled angular dispersions. They demonstrated the importance of near-field couplings and radiation patterns in determining these dispersions.
Researchers from Tsinghua University and MIT developed a thin lensless camera free of noise using Fresnel zone plate and compressive sensing algorithm. The FZA imaging system can capture high-quality images with single-shot 'hologram' without calibration, driving down the cost of camera production.
A new study simulates electron dynamics during femtosecond laser ablation of MoS2, revealing two types of ablation mechanisms and distinct electron dynamics. The results show that higher fluence induces superheated liquid formation, leading to dramatic changes in reflectivity and micro-honeycomb structures.
Researchers developed plasmonic metasurfaces that can be tuned with polarization light, providing efficient saturable absorption for ultrafast lasers. The metasurfaces achieved stable self-starting ultrashort laser pulse generation with a modulation depth of up to 60%, outperforming previous studies.
A diffractive neural network, implemented by a compound Huygens' metasurface, realizes all seven basic optical logic operations in a compact system using a plane wave as input signal. The design strategy features flexible modification and eliminates the need for precise control of input light.
Researchers design an experiment to demonstrate chirality-dependent optical lateral force on microparticles, achieving robust bidirectional sorting and reversible optical lateral forces. The study opens new avenues for direct detection and sorting of microparticles with imperceptible chemical differences.
Scientists have developed a new scheme to generate near-single-cycle mid-infrared pulses in plasmas, achieving conversion efficiencies of up to 30%. The method uses two terawatt-level short-pulse lasers incident into an underdense plasma channel, producing a tunable mid-infrared pulse with millijoules of energy.
Researchers proposed a new scheme to generate near-single-cycle mid-infrared light pulses with a few millijoules in energy, achieving a high conversion efficiency of 30%. The method utilizes two terawatt-level short-pulse lasers and an underdense plasma channel.
Researchers have developed a visible-wavelength passively mode-locked all-fibre laser, generating picosecond pulses at 635 nm. The laser has a tunable duration and a narrow spectral bandwidth, opening up new possibilities for applications in optical communications, biomedicine, material processing, and scientific research.
Scientists discovered a new phenomenon allowing for three-dimensional RI modification in transparent materials, enabling the fabrication of compact photonic devices. The technology has potential to significantly miniaturize 3D photonics circuits, increasing optical quantum computer capacity.
Researchers have developed a new technique that uses 3D-printed aspherical microlenses to overcome the limitations of traditional microscope objectives. This allows for ultra-long-working-distance spectroscopy, enabling researchers to study single nanometre-sized light emitters without the need for bulky microscopes.
Scientists have developed an all-fiber optical wavelength converter using few-layer gallium selenide (GaSe) nanoflakes, enhancing efficiency by over four orders of magnitude compared to traditional microfibers. The converter can operate in a wide wavelength range, covering C, L telecom bands and the O band, with minimal power consumption.
Scientists developed an OLED with bright 1.5 μm electroluminescence due to enhanced Er emission through compositing an organic phosphorescent iridium complex with a separated organic erbium complex molecule.
Scientists developed a new method to increase PL quantum yield of perovskites from 2.5% to 71.54% by adding water, maintaining luminescence in various solvents and exhibiting excellent ambient and thermal stability.
Scientists create a concept based on periodic phase transformation to compensate for phase mismatching in nonlinear crystals, enabling efficient conversion of ultraviolet to deep-ultraviolet wavelengths. The approach may revolutionize nonlinear and linear modulation in photonics.
New OIHP/BHJ photodetectors offer ultra-fast response times of just 5.6 nanoseconds and a high external quantum efficiency of ~54% in the NIR region. They also achieve large linear dynamic range and room temperature stability, enabling high-quality imaging applications.
Researchers from China and Australia introduce the O-FIB technique, enabling high-resolution nano-writing in solid materials. The method uses far-field-induced near-field breakdown for direct nanowriting, achieving resolutions as low as sub-20 nm.
Researchers discovered a new mechanism of optical gain in two-dimensional materials that requires only extremely low input power. This breakthrough has significant implications for the development of energy-efficient photonic devices, potentially reducing the need for high electrical power.
Scientists demonstrate multi-nanosecond lasing at room temperature using novel direct-indirect semiconductor heterostructures. The novel material structure and high-quality cavity contribute to a low lasing threshold of just 6uJ/cm^2.
Scientists developed a new method to investigate plasmonic activity during tip-enhanced Raman spectroscopy. This enables real-time optimization of experimental conditions, improving the usability of TERS for biological samples.
Researchers have created a 3D phononic crystal that hosts symmetry-enforced Dirac points at the Brillouin zone corners. These points exhibit conical dispersion and vanishing density of states around them, making the material an ideal platform for simulating relativistic Dirac physics.
The Learning to Synthesize (LS-DNN) approach splits input signals into low and high spatial frequency bands, enabling deep neural networks to process and synthesize them. The algorithm is robust in handling noisy intensity signals, making it suitable for applications like x-rays and sonograms.
Researchers from Light Publishing Center demonstrated an on-chip single-mode CdS nanowire laser with high coupling efficiency, achieving lasing at approximately 518.9 nm with a linewidth of 0.1 nm and side-mode suppression ratio of 20.
Scientists from Zhejiang University and Southeast University in China proposed a novel silicon-graphene hybrid plasmonic waveguide, achieving high-performance photodetectors beyond 1.55 μm. The graphene absorption efficiencies are as high as 54.3% and 68.6%, with measured responsivities of 30-70 mA/W at 2 μm and 0.4 A/W at 1.55 μm.
Researchers from The University of Texas at Austin and Tsinghua University develop a new technology called opto-thermoelectric pulling (OTEP) to achieve the optical pulling of light-absorbing particles. This technique uses directional optical heating to create an asymmetric thermoelectric field, allowing for the trapping of particles a...
Scientists have developed a new photostimuable LiGa5O8: Mn2+ glass ceramic medium for three-dimensional volumetric optical data storage, enabling expanded storage capacity and improved information security. The material's high transparency and controlled crystallization lead to a highly ordered nanostructure with low bit error rates.
Researchers have developed a novel planar chiral mirror that preserves the spin of light upon reflection, overcoming limitations of traditional mirrors. This innovation has potential applications in quantum information processing and quantum optics.
Researchers from Nanyang Technological University, Singapore, demonstrate a convenient way to control exciton flow between different colloidal quantum wells at room temperature through optical signals. They achieve continuous transition among three distinct exciton flow regimes with efficiencies of ~50%, ~90% and ~2%.
A team of researchers developed a fully packaged ultrathin arrayed camera inspired by the Xenos peckii eye, achieving high contrast clear images and super-resolution capabilities. The camera's unique configuration suppresses optical noise, resulting in improved image quality.
Researchers developed a novel receiver scheme for detecting complex-valued double sideband signals with field recovery, called carrier-assisted differential detection (CADD). CADD doubles the electrical spectral efficiency compared to conventional carrier-less differential detection, and is insensitive to chromatic dispersion.
Researchers have developed a new type of birefringent modification using ultrafast laser direct writing in silica glass, enabling ultra-low loss spatially variant birefringent optical elements. These elements can be used for high power lasers, visible and UV light sources, and even multiplexed data storage.
Scientists have developed a novel plasmonic platform to tailor the spontaneous near-to-mid IR emission of HgTe quantum dots, achieving a 5-fold enhancement of PL quantum yield and reducing non-radiative decay. The study demonstrates the potential for precise tuning of IR-emitting QDs' emission, improving device performance.
Scientists have developed a new technique to manipulate the spectral width and shape of mode-locked femtosecond pulses in real-time. The time-stretch-assisted spectral analysis uses a genetic algorithm and dispersion medium to achieve precise control over pulse characteristics.
Researchers directly observe a dynamical topological order parameter to probe coherent quantum time evolution in quantum walks. This allows for the classification and study of quantum walks using a novel approach.
A new form of imaging modality called coded light-sheet array microscopy (CLAM) allows for full 3D parallelized fluorescence imaging without scanning. CLAM reduces photobleaching and preserves biological specimen viability, enabling long-term volumetric imaging.
Scientists developed SR-FACT microscopy, combining label-free ODT and two-dimensional fluorescence microscopy to visualize cellular environment. The technique revealed novel subcellular structures like dark-vacuole bodies interacting with organelles.
A team of European scientists developed a micro-particle size analyser using AI and consumer electronics. The device measures particle size with precision comparable to commercial light-based analysers, but is much smaller, lighter, and cheaper.
Scientists propose a new design that replaces traditional high-n materials with tunable nanolaminate layers to achieve improved performance parameters. The new coating enables larger bandwidth, higher LIDT, and smaller transmission ripples compared to traditional designs.
Scientists at the University of Rochester develop a new material that selectively absorbs light only at solar wavelengths, increasing efficiency by 130%. This innovation enhances solar power generation and has potential applications for thermal energy harvesting devices.
Researchers from Chinese Academy of Sciences have successfully demonstrated diabolical points (DPs) in two strongly coupled microdisks with embedded quantum dots. The system enables a controllable phase shift between the microdisks, indicating potential applications in directional laser and quantum phase control.
Researchers have discovered that organic LEDs (OLEDs) exhibit regions of reduced brightness known as 'switched-back' effects, despite increased applied current. This phenomenon is attributed to negative differential resistance induced by nonlinear electrothermal feedback, which can lead to unstable operation and device breakdown.
Researchers developed a mechanoluminescent material that can visualize pressure application locations for up to three days. The material uses defects in its structure to store energy, which is released as light when pressure is applied or infrared radiation is used.
Researchers have developed a noncontact laser ultrasound technique that generates and detects sound waves on the skin surface using eye- and skin-safe lasers. This method produces images with centimeter depths, comparable to clinical ultrasound, and shows sensitivity to tissue features currently detected by conventional ultrasound.
Researchers create a new type of optical metasurface that imposes phase modulation on reflected light, leading to unidirectional light propagation. The metasurface enables nonreciprocal light propagation in free space with unprecedented large temporal modulation frequency.
Researchers demonstrate direct emission of orthogonal handed circular polarization from achiral luminophore using liquid crystalline phase. The twisted structure allows for the generation of CP light with various polarization states.
Scientists developed flexible and efficient transparent solar cells with colour-neutrality using silicon microwires embedded in a polymer matrix. The devices demonstrate transparency of up to 55% and excellent flexibility, making them promising for future transparent solar cells.
Novel optical elements enable multiplication and division of orbital angular momentum (OAM) of light, offering a promising solution to increase information capacity of optical networks. The research results have been published in Light: Science and Applications.
Researchers have developed a novel 'quantum expander' to improve signal-to-noise ratio at kilohertz frequencies in gravitational-wave observatories. This innovative approach squeezes quantum uncertainty of laser light inside optical resonators, expanding detection bandwidth.
Researchers developed an AI-driven smart metasurface for joint control of EM waves on the physical level and digital pipeline, enabling real-time imaging and recognition of multiple non-cooperative people. The intelligent EM camera can be powered by Wi-Fi signals, allowing for hands-free monitoring without visible sensors.
The development of optical vortices has been divided into three stages: fundamental theories, application development, and technology breakthrough. The recent stage has seen significant advancements in metasurface and OAM-multiplexing, enabling high-capacity optical communication and novel nonlinear phenomena.