- 标题
- 摘要
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- 实验方案
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - High-Speed and Wide Dynamic Range Avalanche Photodiode for Coherent Lidar Application
摘要： A high-sensitivity and a high-power photo-receiver is preferred in coherent lidar system. In this work, we demonstrate top-illuminated APDs, which can simultaneously exhibit low excess noise (k<0.1) and wide 3-dB bandwidth (14GHz) with high responsivity (6.7A/W) under the operation at saturation output (3 mA).
关键词： Avalanche photodiodes (APDs),Lidar
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Photonics Conference (IPC) - San Antonio, TX, USA (2019.9.29-2019.10.3)] 2019 IEEE Photonics Conference (IPC) - Al <sub/>x</sub> In <sub/>1-x</sub> As <sub/>y</sub> Sb <sub/>1-y</sub> Separate Absorption, Charge, and Multiplication Avalanche Photodiodes for 2-μm Detection
摘要： We report separate absorption, charge, and multiplication (SACM) avalanche photodiodes (APDs) in the AlxIn1-xAsySb1-y material system for 2-μm detection. Gain, dark current, and low excess noise are demonstrated.
关键词： noise figure,optoelectronic devices,photodetectors,Avalanche photodiodes,dark current
更新于2025-09-11 14:15:04
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Feasibility of High-Resolution PET Detector Readout by Two-Dimensional Tetra-Lateral Position-Sensitive Silicon Photomultiplier
摘要： In this paper, we present the feasibility of high-resolution PET detector readout by a two-dimensional (2D) tetra-lateral position-sensitive Silicon photomultiplier with an intrinsic cap resistive layer for charge division (CRL-SiPM). The scintillation imaging sensor for 511keV gamma ray detection is realized by coupling a 5×5 array of 0.45×0.45×6 mm3 LYSO crystals to the CRL-SiPM with an active area of 2.77×2.77 mm2 and micro APD cell pitch of ~10 μm. The scintillator arrays are clearly distinguished and good scintillator array imaging with little position distortion has been achieved. An energy resolution of ~13.5% and coincidence time resolution of 555 ps are demonstrated, respectively. Therefore, the potential PET imaging sensor with greatly reduced readout channels has been verified.
关键词： position sensitive,Silicon photomultiplier,LYSO,Avalanche photodiodes,PET detector
更新于2025-09-11 14:15:04
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Position Sensing and High Bandwidth Data Communication using Impact Ionization Engineered APD Arrays
摘要： Position sensing and high bandwidth data reception are functions typically performed by two separate detectors in conventional free space optical communication systems. In this letter, we report low excess noise, impact ionization engineered InAlAs/InGaAs avalanche photodiode arrays that can perform both functions simultaneously.
关键词： position sensitive detectors,Avalanche photodiodes,free-space optical communication,photodetectors
更新于2025-09-10 09:29:36
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Overview on the main parameters and technology of modern Silicon Photomultipliers
摘要： In this paper, we give an overview of the main properties and technological implementation of densely packed Single-photon Avalanche Diode arrays, which are commonly known as Silicon Photomultipliers, or SiPMs. These detectors feature high internal gain, single-photon sensitivity, a high Photon Detection Efficiency, proportional response to weak and fast light flashes, excellent timing resolution, low bias voltage, ruggedness and insensitivity to magnetic field. They compare favorably to the traditional Photomultiplier Tube in several applications. In this overview paper, we go through the SPAD/SiPM theory of operation, the modern SiPM implementations and the typical technological options to build the sensor. This is done in conjunction with the description of the main SiPM parameters, such as the Photon Detection Efficiency, the electrical properties, the primary and correlated noise sources and the Single Photon Time Resolution.
关键词： single-photon avalanche photodiodes,silicon photomultipliers
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Antimonide Based Infrared Detectors for Remote Sensing
摘要： Infrared imaging (3‐25 microns) has been an important technological tool for the past 60 years since the first report of infrared detectors in 1950s. There has been a dramatic progress in the development of antimonide based detectors and low power electronic devices in the past decade with new materials like InAsSb, InAs/GaSb superlattices and InAs/InAsSb superlattices demonstrating very good performance. One of the unique aspects of the 6.1A family of semiconductors (InAs, GaSb and AlSb) is the ability to engineer the bandstructure to obtain designer band‐offsets. Our group investigates fundamental challenges in antimonide based infrared detectors and explores new avenues for next generation infrared detectors, arrays and imagers. The proposed technology has relevance for active and passive imaging for remote sensing applications. In this presentation, I will describe the material science and device physics of the antimonide systems. I will also discuss the challenges in these systems including the identification of defects that limit the performance of the detector. The use of 'unipolar barrier engineering' to realize high performance infrared detectors and focal plane arrays will be discussed. We are currently investigating low excess noise avalanche photodiodes (APDs) using superlattices. This has very important applications in remote sensing as there are two essential trade offs. The first is the conventional speed‐sensitivity trade off that limits the gain‐bandwidth product and the user has to decide the appropriate detector that meets their system requirement. The other trade‐off relates the sensitivity with the dynamic range. Researchers have used elegant approaches with the use of two detectors to achieve a high sensitivity and large dynamic range.
关键词： antimonide,remote sensing,superlattices,infrared detectors,avalanche photodiodes
更新于2025-09-09 09:28:46
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InGaAs-GaAs Nanowire Avalanche Photodiodes Toward Single Photon Detection in Free-Running Mode
摘要： Single photon detection at near-infrared (NIR) wavelengths is critical for light detection and ranging (LiDAR) systems used in imaging technologies such as autonomous vehicle trackers and atmospheric remote sensing. Portable, high-performance LiDAR relies on silicon-based single-photon avalanche diodes (SPADs) due to their extremely low dark count rate (DCR) and afterpulsing probability, but their operation wavelengths are typically limited up to 905 nm. Although InGaAs-InP SPADs offer an alternative platform to extend the operation wavelengths to eye-safe ranges, their high DCR and afterpulsing severely limit their commercial applications. Here we propose a new selective absorption and multiplication avalanche photodiode (SAM-APD) platform composed of vertical InGaAs-GaAs nanowire arrays for single photon detection. Among a total of 4400 nanowires constituting one photodiode, each avalanche event is confined in a single nanowire, which means that the avalanche volume and the number of filled traps can be drastically reduced in our approach. This leads to an extremely small afterpulsing probability compared with conventional InGaAs-based SPADs and enables operation in free-running mode. We show DCR below 10 Hz, due to reduced fill factor, with photon count rates of 7.8 MHz and timing jitter less than 113 ps, which suggest that nanowire-based NIR focal plane arrays for single photon detection can be designed without active quenching circuitry that severely restricts pixel density and portability in NIR commercial SPADs. Therefore, the proposed work based on vertical nanowires provides a new degree of freedom in designing avalanche photodetectors and could be a stepping stone for high-performance InGaAs SPADs.
关键词： free-running mode,InGaAs-GaAs,single photon detection,avalanche photodiodes,near-infrared,nanowires
更新于2025-09-09 09:28:46
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The Measuring System for the Thomson Scattering Diagnostics of the GOL-3 and GDT Facilities
摘要： The measuring system for Thomson scattering diagnostics of the GOL-3 and GDT facilities at the Budker Institute of Nuclear Physics is described. The system has a modular architecture and is based on eight-channel measuring subsystems, including photodetectors, two-channel recorders (ADC12500), synchronization modules, and the Ethernet/UART communication channel adapter. The photodetectors are based on avalanche photodiodes and are operable in the frequency range of 0–50 MHz. The ADC12500 recorders are used to measure scattering signals with a duration of ~20–30 ns at a sampling rate of to 500 MHz and an amplitude resolution of 12 bits and accumulate data in a buffer memory with a capacity as large as 2 MB.
关键词： ADC12500,avalanche photodiodes,GDT,measuring system,Thomson scattering diagnostics,GOL-3
更新于2025-09-04 15:30:14
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Strain effect on band structure of InAlAs digital alloy
摘要： Recently, InAlAs digital alloys have been shown to exhibit unique electronic dispersion properties, which can be used to make low-noise avalanche photodiodes. In this paper, the strain effect is analyzed for its impact on the band structure of the InAlAs digital alloy. Simulation using a tight binding model that includes the strain effect yields bandgap energies that are consistent with experimental results. The bandgap would be larger without strain. In addition, a positive relationship has been found between minigaps of the InAlAs digital alloy and the band offset between bulk InAs and AlAs at the same position in k-space.
关键词： InAlAs digital alloy,avalanche photodiodes,band structure,minigaps,strain effect
更新于2025-09-04 15:30:14