Articles tagged with Photodetectors
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.
A new technique called image-free single-pixel object detection (SPOD) can detect the location, size, and category of multiple objects without acquiring images. SPOD uses a small optimized structured light pattern to quickly scan the scene and extract features, achieving an accuracy of over 80%.
Researchers have developed a novel photoelectrochemical ultraviolet photodetector that can detect two types of ultraviolet light using a multilayered nanostructure. The detector's performance can be regulated through light intensity and external bias, enabling easy adaptation to environmental changes.
A team from UNIGE and ID Quantique has developed single-photon detectors that can generate secret keys at a rate of 64 megabits per second, overcoming current limitations. This innovation enables ultra-secure data transfer for banks, healthcare systems, governments, and the military.
The SF State team has created a broadband nanoscale photodetector using bismuth-MoS2 materials, showing improved sensitivity in the UV range and responsiveness over a wide wavelength range. The device is also fast, working at around 10 kilohertz and potentially scalable to megahertz or gigahertz speeds.
A team of researchers developed an efficient strategy to recycle lead from discarded car batteries, creating a new market for recycled lead in high-tech equipment. The resulting photodetectors show excellent stability and fast response speeds, with potential applications in optical communication, chemical analysis, and imaging.
Researchers have developed a new detector that can precisely measure single photons at very high rates, enabling practical high-speed quantum communication. The PEACOQ detector is made of superconducting nanowires and operates at extremely cold temperatures, allowing for precise measurement of photon arrival times.
A new study published in Radiology: Cardiothoracic Imaging shows that photon-counting detector CT can acquire high-quality images at lower contrast media volume than conventional CT scanners. The technology reduces the amount of contrast needed for CT angiography, improving image quality and reducing environmental impact.
Researchers developed BrightEyes-TTM, an open-source stopwatch to study molecular interactions inside living cells. The platform records the lifetime of fluorescent molecules, providing insights into cellular structure and function.
Researchers have developed a highly-sensitive broadband integrated infrared detector using wafer-scale 2D MoTe₂ layers. The device achieves an ultrabroadband detection range of up to 10.6 μm and a room-temperature specific detectivity of over 10^8 Jones in the mid-infrared region.
Researchers developed a self-powered nanowire sensor that can detect nitrogen dioxide in the air without power source. The sensor has potential applications in environmental monitoring, healthcare, and industrial safety.
Chung-Ang University researchers identify direct electron tunnelling as dominant mechanism of noise in organic photodetectors, enabling enhanced detection speed and improved image sensor performance. The discovery paves the way for miniaturized image sensors with curved designs and omnidirectional sensing capabilities.
Researchers have developed a novel near-infrared light detection method using core-shell lanthanide nanoparticles to convert weak near-infrared light to visible light with high efficiency. This achievement promotes the proposal of a new resource- and energy-saving near-infrared light detection method, improving optical sensor sensitivi...
A study published in the American Journal of Roentgenology found that reconstruction using BI64 kernel and 0.4-mm slice thickness yielded improved bronchial division identification and pulmonary fissure sharpness without loss in pulmonary vessel sharpness or pathology conspicuity.
A research group developed an in-sensor reservoir computing system for latent fingerprint recognition, achieving 100% recognition accuracy even with 15% background noise. The system uses deep ultraviolet photo-synapses and a memristor array to process information in parallel, reducing latency and increasing efficiency.
Researchers developed high-capacity free-space optical links using unipolar quantum optoelectronic devices, achieving unprecedented data rates of up to 30 Gbit/s at 31-meter distances. The system's performance is resistant to weather conditions and showcases potential for fast, long-range optical links.
Scientists developed a method to introduce carbonized polymer dots into quasi-2D perovskite photodetectors, improving their flexible stability without losing photo-response. The devices showed lower dark current and detectable light intensity, paving the way for high-performance flexible optoelectronic devices.
A team at KAUST has created an ultrathin dielectric metalens that improves focusing capabilities and can be scaled down for integration with photonics equipment. The metalens, designed from a custom array of TiO2 nanopillars atop a DBR, offers negligible intrinsic loss and easy fabrication.
Researchers have created III-nitride/MoSx core-shell nanostructures with negative and positive photoresponsivity under different wavelengths, demonstrating a new universal photodetector architecture. This breakthrough enables spectrally sensitive photoelectrochemical photodetectors for various applications.
Researchers propose an optical imaging system for real-time hypoxia imaging in cancer treatment. The technique utilizes protoporphyrin IX to enhance contrast between tumors and healthy tissues, allowing for more effective surgical removal.
The new photodetector design combines long-range transport of optical energy with long-range conversion to electrical current, mimicking the photosynthetic complexes found in plants. The device can gather light from areas of about 0.01 mm² and achieve conversion of light to electrical current over exceptionally long distances of 0.1 nm.
Researchers developed a silicon photodiode array for in-sensor processing, allowing for real-time image filtering and extraction of relevant visual information. The technology has potential applications in machine vision, bio-inspired systems, and intelligent imaging devices.
Researchers have developed highly sensitive and mass producible organic photodetectors that can detect weak signals. The new photodetectors exhibited a detectivity comparable to those of conventional silicon photodiodes, operating stably under temperatures above 150 °C.
A graphene photodetector with a double slot structure exhibits high responsivity of 603.92 mA/W and large bandwidth of 78 GHz, addressing the limitations of graphene's low optical absorption. The novel design promotes graphene absorption while minimizing metallic absorption, providing a competitive solution for photodetection on silicon.
Researchers developed efficient metal-free polymeric scintillators for high-resolution X-ray imaging, outperforming conventional anthracene-based scintillators. The polymers exhibit multicolor radioluminescence and high photostability, enabling applications in radiation detection, medical diagnosis, and security inspection.
Researchers from KAUST have designed an all-inorganic halide-perovskite polymer-fiber-photodetector that can detect light in the green region (around 510 nm), enabling fast underwater optical communications. The system offers a 3dB bandwidth of 13.1 MHz, allowing data transmission speeds of up to 152.5 Mbit/s.
The study introduces a promising strategy for chip-integrated photodetectors by integrating van der Waals PN heterojunctions of 2D materials on optical waveguides. This approach enables low dark current, high responsivity, and fast speed, while simplifying fabrication processes and reducing costs.
Scientists have successfully developed lead-free bismuth halide perovskites with broadband emission, overcoming toxicity and instability issues of traditional lead-based materials. The new material exhibits high efficiency and stability, paving the way for potential applications in artificial lighting and displays.
A UVA-led research team is working on a photonics-based radar and GPS system that can operate at frequencies up to 110 gigahertz, three times higher than current 5G systems. The system has the potential to provide ultra-stable signals for applications like communications, positioning, and ranging.
Researchers are taking stock of advancements in ultrawide bandgap (UWBG) photodetectors with deep UV capabilities, highlighting their efficiency and potential for solar-blind applications. Further work is needed to optimize device performance, particularly in assembling materials over large area substrates.
This special issue of Energy Material Advances highlights recent progress in synthesizing and tuning perovskite nanocrystals and other emerging nanocrystal materials. Research focuses on fundamental understanding of doping, synthesis, and spectroscopy, as well as applications in solar cells and light-emitting diodes.
A team of scientists has discovered a way to bend electrons without applying a magnetic field by using circular polarized light in bilayer graphene. This breakthrough enables new sensing applications and opens up possibilities for infrared and terahertz sensing, medical imaging, and security applications.
KAUST researchers develop an artificial electronic retina that mimics human vision and recognizes handwritten numbers with high accuracy. The retina uses perovskite nanocrystals to detect light intensity via capacitive change, offering a more energy-efficient alternative to existing systems.
Researchers at Georgia Institute of Technology created soft flexible photodetectors that are up to 200% stretchable and can detect fainter light levels than conventional devices. The breakthrough material has potential applications in medical wearable sensors, implantable devices, and intelligence systems.
Researchers have developed a room-temperature perovskite polariton parametric oscillator, enabling scalable and low-threshold nonlinear devices. This breakthrough offers possibilities for the development of cost-effective and integrated polaritonic devices.
A KAUST-led team reviewed strategies for mitigating damage to transparent electrodes in optoelectronic components. The team identified buffer layers as a potential solution, with strengths and weaknesses of different materials and techniques for creating them.
Researchers at Incheon National University have developed a compact and robust optical sensor that can convert light to digital signals, suitable for flexible electronics. The new design architecture enables superior chip area efficiency and large-area scalability.
Researchers have developed a new type of photodetector using MXene and GaN materials, showing improved responsivity, dark current, and noise in the blue-green light spectrum. The use of MXene-GaN van der Waals interfaces reduces defect states and improves the device's performance.
Recent progresses of silicon/2DM PDs are reviewed for their potential applications in various functional photonic integrated circuits. The article discusses the operation mechanisms, device configurations, and application scenarios of these photodetectors.
The NTU team created flexible UV light sensors that are 25 times more responsive and 330 times more sensitive than existing sensors. These sensors can be used in wearable devices to monitor personal UV exposure and reduce the risk of skin cancer.
Researchers at UVA's Charles L. Brown Department of Electrical and Computer Engineering are working on a project called PATRONUS, which aims to integrate photonic integrated circuits into a single chip. This could lead to faster data centers and next-generation wireless communication systems.
Researchers have developed a self-powered, UV photodetector using coordination nanosheets that demonstrate exceptional photocurrent stability under air exposure. The device, composed of an iron ion bonded to a benzene hexathiol molecule, retains over 94% of its photocurrent after 60 days.
Researchers have developed high-performance polarization-sensitive photodetectors on 2D β-InSe, exhibiting excellent stability and strong anisotropic optical and electronic properties. The material's unique crystal structure enables direct detection of polarized light without optical filters or polarizers.
Scientists create a 2D/3D hybrid perovskite heterostructure crystal, achieving high polarization sensitivity in photodetection. The device surpasses reported perovskite-based devices and is competitive with conventional inorganic heterostructure-based photodetectors.
Researchers developed a method to suppress phase segregation in large perovskite single crystals, yielding state-of-the-art devices with long carrier lifetime and high charge mobility. The resulting photodetectors exhibited high responsivity, photoconductive gain, and fast response speed, paving the way for novel imaging applications.
Researchers at Northwestern University have developed a new approach to quantum device design, producing the first gain-based long-wavelength infrared photodetector using band structure engineering. The advanced photodetector offers enhanced sensitivity for next-generation LWIR photodetectors and focal plane array imagers.
Organic photodetectors (OPDs) have shown high efficiency but are limited by trap states that cause noise in the off state. Research has identified traps as a major factor in OPD performance. The study provides guidance for further research into understanding and mitigating these limitations.
Researchers at Penn State have developed an ultra-thin and energy-efficient photodetector on glass, paving the way for commercialization of 'smart glass' technology. The technology can be applied in various industries, including manufacturing, transportation, and healthcare.
Researchers at Swansea University developed a new method to detect tiny signatures of 'charge traps' in organic semiconductors, which may improve the performance of solar cells, photodetectors, and OLEDs. The study found that charge traps can generate new charges rather than annihilate them completely.
The new photodetector achieves ultrasensitive detection, stable operation under extreme conditions, and ultrabroad spectrum detection exceeding 10μm.