Single photon counting and imaging are techniques used to detect, measure and visualize extremely weak light signals, down to single photons. Photonis part of Exosens, single photon detectors are used in a range of applications, such as High end LIDAR, Quantum optics and Quantum telecommunication, High energy physics, Particle physics, Nuclear physics, Fluorescence imaging, Astronomy, Plasma research and others. To detect single photon signals, Photonis proposes various types of high-sensitivity, fast-timing, low-noise, vacuum tube-based single photon detectors for OEM and end-user applications. Our team of experts provide support and consulting services to help select and implement the right single photon detector for applications such as space based High end LIDAR and others.
Photonis multialkali Hi-QE photocathode technology combines a high quantum efficiency (QE) in the 120-1050 nm spectral range, with a dark count rate as low as 50 Hz/cm², thereby achieving a superb signal to noise ratio. When the photocathode is utilized as an ultra-fast electro-optical shutter, sub nanosecond (billionth of a second) gating speeds can be achieved for accurate transient phenomena imaging. Photonis single photon detectors are based on patented high end microchannel plate (MCP) technology offering a high dynamic range and an unmatched collection efficiency of >95%.
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Frequently asked questions
How do Vacuum Tube-Based Detectors Work?
Vacuum tube-based Image Intensifier tubes consist of several essential components; a Photocathode, a Microchannel Plate (MCP) and an anode. These components work together to amplify input signal, creating a rich and dynamic output.
In the first step, existing ambient light passes through a photocathode, which converts the incoming photon signal into a photo-electron.
In the second step, photoelectrons are drawn by an electrical field into the MCP where they impinge multiple times on the inner walls and thereby multiply several thousands of times. In photon counting applications the multiplied electron signal is detected using an anode. In the instance of photon imaging applications, the anode converts the electron back into photons to produce an image.
What are the Main Challenges in Single Photon Detection?
The main challenges in single photon detection include:
- Detection efficiency: The detection efficiency refers to the probability of a photon being detected by the detector. Achieving high detection efficiency is crucial in single photon detection applications. The efficiency depends on factors such as the detector technology, photon wavelength, and optical coupling efficiency. Maximizing detection efficiency is essential for capturing the highest possible number of photons.
- Timing resolution: Many applications involving single photon detection require precise timing information, such as in time-correlated single photon counting (TCSPC) or quantum cryptography. Achieving high timing resolution is challenging, as it requires fast electronics and detectors with short response times to accurately capture the arrival times of individual photons.
- Spatial resolution
- Spectral resolution
- Environmental and operating conditions
- Integration and scalability: In some applications, there is a need for miniaturized or integrated single photon detectors. Challenges arise in developing compact, robust, and efficient detector designs that can be integrated into complex systems or small-scale devices while maintaining high performance.
What Impacts the Detection Efficiency of Single Photon Detectors?
Quantum Efficiency (QE) is a key objective in the development of single photon detectors, as it directly impacts the overall performance of the device.
What are the Limitations of Current Single Photon Detection Technologies?
Current single photon detection technologies often struggle to achieve high performance across all relevant metrics, such as sensitivity, timing resolution, spatial resolution, and spectral resolution, without compromising on other aspects of detector performance.
What are the Potential Applications of Single Photon Detection in the Future?
Single photon detection has potential applications in a wide range of fields, including quantum communication and computing, biomedical imaging, LIDAR, astronomy, and remote sensing.
How do Researchers Plan to Overcome these Technical Challenges?
Researchers are exploring novel materials, device architectures, and fabrication techniques to address the technical challenges in single photon detection. This includes the development of new materials, such as 2D materials or perovskites, improved detector designs, advanced signal processing algorithms, and innovative cooling and shielding techniques. By pushing the boundaries of what is possible in single photon detection, researchers aim to unlock the full potential of this groundbreaking technology for a wide range of scientific and industrial applications.
What's new in Single photon detection?See all
Jan 18th 2024
Exosens is proud to announce the expansion of its Photonis Ultimate Detection Scientific Imaging product portfolio with the introduction of the 25 mm Image Intensifier solution.
Feb 06th 2024
Photonis shall deliver 40,000 image intensifier tubes to boost military night vision in Germany and Belgium
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