Terahertz single-photon radar detection technology

Abstract

Terahertz single-photon radar detection technology implements single-photon detection in the terahertz region. It combines the high-resolution characteristics of the terahertz wave and the extreme high detection sensitivity of the single-photon radar. Because the power response threshold is as low as the single-photon level, terahertz single-photon radar has an extremely low noise level with fairly high sensitivity. It is capable of detecting weak signals via the timecorrelated single-photon counting technique, and it is expected to significantly extend the detection range of the current terahertz radar systems. In this paper, we at first reviewed the background of the terahertz single-photon radar detection technology, and expounded its principles, characteristics, and state-of-the-art technologies. We then proposed two typical technical approaches, including the direct detection and heterodyne detection methods, and presented an insight into the design of radar systems. Finally, we analyzed the current key issues in the terahertz single-photon radar detection technology and discussed its potential applications such as the radar range-extending, remote air defense early-warning, and anti-stealth. We believe that the results will provide a feasible technical approach to break through the bottlenecks of the detection capability and detection range of terahertz radar systems. Furthermore, the results would promote the innovation and development of the detection mechanism, methods, systems, and devices employed in terahertz technology. Thus, this study can provide a powerful impetus for the development and application of the terahertz technology, both in military and civilian fields.terahertz, single-photon radar, photon counting

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