Articles tagged with Photodetectors
A high-radiation-tolerance GaN detector was fabricated to enable real-time two-dimensional position detection of individual alpha particles and xenon heavy ions. The detector exhibited stable operation at radiation levels significantly higher than those tolerated by conventional Si-based detectors.
Researchers develop a roadmap for surface/engineering techniques to create ultra-sharp photodetectors with improved resolution, speed and energy efficiency. Key features include defect healing, band-gap sculpting, light-management, and mechanical bridging.
Researchers reviewed recent advances and perspectives of TFLN-based detectors, outlining physical mechanisms for photodetection and implementation schemes. Direct material modification techniques expand the photodetection mechanism and application scope of lithium niobate materials.
A team of researchers from Shanghai Jiao Tong University developed a self-powered asymmetric Schottky photodetector integrated with thin-film lithium niobate waveguide. The device leverages the property of internal stress in MoTe2 to enhance light absorption and exhibit pronounced self-powered behavior.
Researchers have designed a new oligomer-based organic photodetector that achieves efficient SWIR (Short-Wavelength Infrared) photoresponse. The device features a thiophene-fused BODIPY tetramer with meta-dicyanophenyl end groups, enabling J-aggregation and cooperative molecular packing behavior.
Researchers have created a tiny spectrometer that can accurately measure light wavelengths and is small enough to fit on a phone. The technology has the potential to be integrated into smartphones and enable new applications in fields like manufacturing and biomedical diagnostics.
Researchers developed a novel flexible PTE photodetector that combines electrical and optical signal generation, advancing human–machine collaborative infrared imaging. The device demonstrates improved flexibility and autonomy without external instruments.
Researchers developed a room-temperature THz detector that offers high sensitivity, fast response, and scalability for large-scale arrays. The use of a two-dimensional electron gas channel enables non-equilibrium carriers to travel faster and more efficiently, broadening the THz response range.
KAIST researchers developed a highly sensitive mid-infrared photodetector that operates at room temperature, enabling low-cost mass production and real-time sensing of various molecular species. The technology has potential applications in environmental monitoring, medical diagnostics, and industrial process management.
Scientists have created a new method to create silver telluride colloidal quantum dots that overcome challenges of high dark current, limited linear dynamic range, and response speed. The team developed the first proof-of-concept SWIR LIDAR using these non-toxic materials, measuring distances over 10 meters with decimetre resolution.
Researchers at TUM integrate 60 camera pixels into a single detector, achieving unprecedented resolution of up to 3840 MPixels. This technology enables the observation of tiny shifts due to gravity in antihydrogen beams and has broader applications in experiments requiring high position resolution.
Researchers developed a fabrication technique to overcome design challenges for scalable single-photon detectors, enabling ultra-fast detection of photons regardless of direction or polarization. The study provides a comprehensive guide to fabricating high-quality fractal SNSPDs with improved sensitivity and system detection efficiency.
A team at Osaka University discovered that temperature-controlled conductive networks in vanadium dioxide enhance the sensitivity of silicon devices to terahertz light. The researchers created 'living' microelectrodes from VO2, which selectively enhanced the response of silicon photodetectors.
A new technique allows for precise tracking of tiny particles known as dark excitons in time and space. This breakthrough has the potential to improve the quality and efficiency of solar cells and other devices.
Researchers have developed a perovskite X-ray detector that uses cascade engineering to reduce dark current, enabling high-quality medical images at ultra-low doses. The device achieved a detection limit of 100 nGy·s−1, a significant improvement over previous limits.
Researchers developed high-sensitivity and low-noise infrared superconducting nanowire single-photon detectors, achieving sub-mK temperature resolution. The detectors used photon counting technology, overcoming limitations of conventional semiconductor detectors.
A team of researchers created a high-efficiency broadband light absorber within an ultrathin amorphous silicon layer embedded with silver nanorings, achieving over 100% photonic enhancement. Machine learning techniques were used to optimize the design, significantly reducing computational resources needed for metamaterial design.
Researchers developed a miniaturized all-fiber photoacoustic spectrometer for intravascular gas detection, achieving detection limits of 9 ppb and response times as quick as 18 milliseconds. The system detects trace gases at the ppb level and analyzes nanoliter-sized samples with millisecond response times.
A new technique for detecting long wave infrared photons of different wavelengths has been developed by UCF researchers. This method, based on a nanopatterned graphene, offers dynamic spectral tunability and ultrafast response times, surpassing existing cooled and uncooled detectors.
Chinese researchers have developed an on-chip integrated polarization photodetector inspired by desert ants' ability to perceive polarized sunlight. The team created a high-crystalline perovskite single-crystal-thin film with quadridirectional grating arrays, enabling a simple and cost-effective polarization imaging system.
Researchers developed a screening technique to filter out low-quality data in wearable sensors, improving the performance of smartwatches for noninvasive blood glucose estimation. The approach enhances accuracy by discarding data with high phase errors and approximating missing values.
Scientists at Paderborn University used high-performance computing to analyse a quantum photonics experiment, performing calculations in just minutes. The findings have significant implications for characterising photonic quantum computer hardware and will shape the future of quantum research.
Researchers developed a wavelength sensor using photocurrent waveforms, achieving precise wavelength recognition with an error rate below 0.1%. The approach offers valuable insights for future spectrum optoelectronic devices.
A new type of OLED device can amplify and convert near infrared light into visible light, promising low power consumption and long battery life. The device has a memory effect that could enable computer vision systems to sense and interpret incoming light signals.
Researchers have developed a novel pyroelectric photoconductive diode (PPD) for highly sensitive and fast high-energy photon detection. The PPD exhibits high responsivities to deep ultraviolet (DUV) and X-ray, with enhanced detection performance compared to traditional photodiodes.
Researchers have developed a new 3D method for fast-moving object tracking at unprecedented speeds, with potential applications in autonomous driving, industrial inspection and security surveillance. The approach uses single-pixel imaging to calculate the object's position in real-time, reducing data storage and computational costs.
Scientists developed a miniaturized micro-spectrometer to detect multiple toxic and greenhouse gases, offering increased control over individual exposure. The technology uses machine learning and metasurface spectral filter arrays to create a compact sensor that can be integrated into wearable devices.
Researchers at TMOS have developed a new infrared filter thinner than cling wrap, which can be integrated into everyday eyewear, allowing users to view both visible and infrared light spectra. This breakthrough miniaturizes night vision technology, opening up new applications in safety, surveillance, and biology.
Researchers have developed a new perovskite-based camera inspired by the structures and functions of bird's eyes, specializing in object detection. The camera features an artificial fovea and multispectral image sensor that detects UV and RGB light, providing greater motion detection capabilities than conventional cameras.
A new, affordable sensor technology can detect lead concentrations as low as one part per billion, making it a significant step forward in addressing global health issues. The handheld device can be used for on-site monitoring and requires only a droplet of water.
Researchers propose a new circuit model to optimize quantum dot-based infrared up-conversion photodetectors. The study reveals that poor matching between PD units and QLEDs is the main limit to efficiency, with integration losses due to visible emission absorption in PbS layers being a significant contributor.
Researchers have developed a miniaturized optical sensor that can detect glucose levels in human blood plasma with comparable sensitivity to laboratory-based sensors. The device operates wirelessly using a coin battery and has demonstrated its viability in detecting glucose levels between 50-400mg/dL.
A novel approach estimates metabolic activity and infers blood glucose levels from near-infrared measurements in commercial smartphones and smartwatches. The phase delay between oxyhemoglobin and deoxyhemoglobin signals closely relates to oxygen consumption during cardiac cycles, serving as a gauge for metabolism.
Researchers have discovered unique electromagnetic signals in the debris of a neutron star merger, which could provide new constraints on axion-like particles and their potential role in dark matter. The findings were made using data from NASA's Fermi-LAT gamma-ray telescope.
Researchers at Paderborn University have developed a new method for determining the characteristics of optical quantum states using photon detectors, enabling precise knowledge essential for quantum computing and information processing.
A new perovskite single-pixel detector efficiently extracts dual-color metasurface images in complex environments, leveraging wavelength-selective properties and high detection sensitivity. The system streamlines image extraction with no need for additional filters, reducing cost and time.
Scientists at Shanghai Institute of Microsystem and Information Technology enhance the photon-number-resolving capability of single-photon detectors by widening superconducting strips. This results in better dynamic range and fidelity, enabling true-photon-number resolution up to 10.
Researchers developed a compact microscope using a single photon avalanche diode array detector, enabling super-resolution imaging with improved signal-to-noise ratio and spatial resolution. The system also combines fluorescence lifetime measurements for enhanced structural specificity.
Researchers at ICFO have developed a new method to synthesize arsenic-free InSb colloidal quantum dots with access to the SWIR range. The InSb/InP core-shell structure improves stability and sensitivity in SWIR photodetectors, offering an environmentally friendly alternative to epitaxial technology.
Researchers develop non-toxic colloidal quantum dots enabling high-performance shortwave infrared photodetectors and image sensors. The new material exhibits remarkable performances, including a spectral range of 350-1600nm.
Scientists at Tohoku University successfully developed a room-temperature terahertz-wave detector using 2D plasmons, overcoming key bottlenecks in conventional detectors. The breakthrough enhances detection sensitivity by over an order of magnitude, enabling faster and more sensitive THz wave detection.
A new technique for photon detection has been developed by UCF researcher Debashis Chanda, offering ultra-sensitive detection at room temperature. The method uses a phase-change material to modulate the frequency of an oscillating circuit, paving the way for low-cost, high-efficiency uncooled infrared detectors and imaging systems.
Researchers developed an X-ray imaging technique that produces detailed images of living organisms at high resolution while minimizing radiation exposure. This advance enables small organisms to be studied over longer periods, revealing new insights into dynamic processes.
The study found that 3D integration can lead to significant heat spreading and crosstalk, reducing heater efficiency by up to -43.3% and increasing thermal crosstalk by up to +44.4%. However, optimizing design variables, such as spacing between µbumps and interconnect linewidth, can minimize the thermal penalty of 3D integration.
The new system enables infrared non-line-of-sight imaging, improving safety and efficiency for unmanned vehicles and robotic vision applications. Spatial resolution of less than 2 cm achieved at both 1560 and 1997 nm wavelengths.
Researchers developed three diffractive deep neural networks using orbital angular momentum to recognize objects in images, achieving accuracy comparable to wavelength and polarization-based models. The technology has potential for real-time processing applications like image recognition and data-intensive tasks.
Researchers at NICT developed a novel structure for superconducting strip photon detectors, achieving high performance and polarization independence. The new technology enables the creation of wider strips, increasing productivity and reducing fabrication costs.
Researchers at NIST built a superconducting camera containing 400,000 pixels to capture weak light signals. The new device enables applications in science and biomedical research by having more pixels than any other device of its type.
Researchers have developed an integrated THz vortex beam emitter to detect rotating targets with remarkable precision. The system uses spiraling electromagnetic waves with orbital angular momentum to accurately measure the speed of a rotating object, with a maximum margin of error of just around 2 percent.
A new device based on twisted double bilayer graphene has been developed, showing radical improvement in ultra-broadband photodetection. The device can detect light efficiently over a wide spectral range, from far-terahertz to near-infrared, with good internal quantum efficiency and scalability.
GIST researchers found that nano-sized pits on AlN surfaces cause graphene degradation at higher temperatures, leading to GaN film exfoliation failure. The study's results demonstrate the importance of substrate chemical and topographic properties for successful remote epitaxy.
Researchers use surface normal nonlinear photodetector to improve speed and energy efficiency of diffractive optical neural networks. The new device can perform high-speed image and video processing at the speed of light in an extremely energy efficient manner.
A team of researchers has created a simple and versatile fabrication approach for writing custom light-emitting diodes (LEDs) or photodetectors using handheld ballpoint pens. The new technology builds on earlier work, allowing individuals to create stretchable LEDs without specialized training or equipment.
Quantum ghost imaging allows 3D imaging on a single photon level, enabling the lowest photon dose possible. The technique can be applied to image materials and tissues sensitive to light or drugs without risk of damage.
A new approach boosts light absorption in thin silicon photodetectors with photon-trapping structures, increasing the absorption efficiency over a wide band in the NIR spectrum. The findings demonstrate a promising strategy to enhance the performance of Si-based photodetectors for emerging photonics applications.
Metalenses have been developed with differentiated design principles to eliminate chromatic aberration. By merging bright spots into a single focusing spot, researchers achieved an efficiency of up to 43% and demonstrated the versatility of their approach for various optical applications.
Researchers design a silent state enhanced on-chip infrared circular polarization detector with an ultrahigh circular polarization discrimination ability. The device sets an optoelectronic silent state, suppressing noise and allowing for high sensitivity to light ellipticity change.
Researchers have developed flexible photodetectors that can detect visible to long-wave infrared radiation, covering the full spectrum of greenhouse gases without complex optical components. The new detectors are simple and cost-effective to make, with production at room temperature.
Researchers at Tokyo Institute of Technology have successfully synthesized high-quality Cs3Cu2I5 thin films using a novel solid-state synthesis method. The team discovered that depositing CuI and CsI layers in specific ratios results in distinct local structures containing point defects, leading to highly efficient emissions.
Researchers have developed a quantum lidar system that uses single-photon detection to acquire high-resolution 3D images underwater. The technology has the potential to inspect underwater installations, monitor submerged archaeology sites, and enhance security applications.