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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Science: general issues --- semiconductor nanocrystals --- quantum dots --- colloids --- perovskite --- phosphide --- photocatalysis --- infrared photodetectors --- laser patterning

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Optical detectors. --- Light-sensitive cells --- Light-sensitive detectors --- Light sensor photodevices --- Photodetectors --- Photodevices, Light sensor --- Photoelectric detectors --- Photosensors --- Detectors --- Optical transducers --- Optoelectronic devices

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Detection of Light provides a comprehensive overview of the important approaches to photon detection from the ultraviolet to the submillimeter spectral regions. This expanded and fully updated second edition discusses recently introduced types of detector such as superconducting tunnel junctions, hot electron bolometer mixers, and fully depleted CCDs, and also includes historically important devices such as photographic plates. Material from many disciplines is combined into a comprehensive and unified treatment of the detection of light, with emphasis on the underlying physical principles. Chapters have been thoroughly reorganised to make the book easier to use, and each includes problems with solutions as appropriate. This self-contained text assumes only an undergraduate level of physics, and develops understanding as it is needed. It is suitable for advanced undergraduate and graduate students, and will provide a valuable reference for professionals in astronomy, engineering and physics.

Optical detectors. --- Light-sensitive cells --- Light-sensitive detectors --- Light sensor photodevices --- Photodetectors --- Photodevices, Light sensor --- Photoelectric detectors --- Photosensors --- Detectors --- Optical transducers --- Optoelectronic devices

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Photonics has had a decisive influence on recent scientific and technological achievements. It includes aspects of photon generation and photon–matter interaction. Although it finds many applications in the whole optical range of the wavelengths, most solutions operate in the visible and infrared range. Since the invention of the laser, a source of highly coherent optical radiation, optical measurements have become the perfect tool for highly precise and accurate measurements. Such measurements have the additional advantages of requiring no contact and a fast rate suitable for in-process metrology. However, their extreme precision is ultimately limited by, e.g., the noise of both lasers and photodetectors. The Special Issue of the Applied Science is devoted to the cutting-edge uses of optical sources, detectors, and optoelectronics systems in numerous fields of science and technology (e.g., industry, environment, healthcare, telecommunication, security, and space). The aim is to provide detail on state-of-the-art photonic technology for precision metrology and identify future developmental directions. This issue focuses on metrology principles and measurement instrumentation in optical technology to solve challenging engineering problems.

infrared thermometer --- mid-wave infrared --- indium arsenide antimony photodiode --- uncooled thermometer --- fibreoptic coupling --- chopper stabilised op-amp --- zero-drift pre-amplifier --- ammonia detection --- NH3 --- MOX sensors --- polymer sensors --- laser absorption spectroscopy --- CRDS --- CEAS --- MUPASS --- PAS --- HOT IR detectors --- HgCdTe --- P-i-N --- BLIP condition --- 2D material photodetectors --- colloidal quantum dot photodetectors --- low-light photodetectors --- fluorescence microscopy --- time-resolved fluorescence microscopy --- hybrid photodetector (HPD) --- single-molecule fluorescence detection --- fourier ptychography --- image classification --- deep learning --- neural network --- electro-optic modulator --- frequency modulation --- displacement measuring interferometer --- quantum cascade laser --- laser controller --- infrared modulator --- laser spectroscopy --- free space optics --- photonic metrology --- accuracy --- precision --- resolution --- FTIR --- absorption spectroscopy --- gas sensors --- optoelectronic sensors

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This book provides a wide-ranging overview of the current state-of-the-art and new trends in photodetector design and research. Written by a team of internationally renowned experts, with contributions from universities, research institutes and industries, this work is suitable for students and professionals interested in studying and dealing with photodetector design and technology, as well as the wide gamut of related applications. Its coverage includes: physics and fundamentals of photodetectors; physical models of photodetector operation; new materials, design, processing and function of photodetectors in related applications; testing, monitoring and calibration; and research progress in photodetector-related areas. Theoretical aspects, design and simulation principles, and important experimental results are thoroughly addressed, embodying a comprehensive account of current activity in this important field of research and industry.

Optical detectors. --- Light-sensitive cells --- Light-sensitive detectors --- Light sensor photodevices --- Photodetectors --- Photodevices, Light sensor --- Photoelectric detectors --- Photosensors --- Detectors --- Optical transducers --- Optoelectronic devices --- Engineering --- Physical Sciences --- Engineering and Technology --- Electrical and Electronic Engineering --- Photonics