Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver
Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver
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DOI：
10.1109/jlt.2021.3092779
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发表时间：
2021-12-15
影响因子：
4.7
通讯作者：
Nagatsuma, Tadao
中科院分区：
文献类型：
--
作者：
Yi, Li;Nishida, Yosuke;Nagatsuma, Tadao
太赫兹（THz）成像技术近年来得到了广泛的关注和迅速的发展。然而，尽管取得了一些进展，这些技术仍然不成熟，而且它们的高成本和系统复杂性继续限制它们的应用。在本文中，考虑到当前技术的局限性，讨论了用紧凑的太赫兹收发器实现实用成像系统的技术。目的是提供相关主题的简要回顾，同时也涵盖了我们最近的进展，这可以为实现一个实用的太赫兹成像系统提供一些一般的观点和对比的方法。连续波器件主要以其平衡成像分辨率和数据采集时间的灵活性而受到关注。本文还讨论了收发器集成的重要性，并介绍了一个600 ghz波段的微光子接口，用于集成太赫兹源和探测器，用单个谐振隧道二极管作为收发器。关于系统问题，讨论了机械波束扫描的空间采样作为移动平台和阵列技术的中间方法。对这种方法的潜力和局限性进行了评估，同时由于其低成本和简单性，椭圆反射器作为f-theta透镜的替代品。我们还讨论了集成器件与机械波束扫描的结合，以展示我们目前实现实用太赫兹成像系统的概念。
Terahertz (THz) imaging techniques have attracted significant attention and have developed rapidly in recent years. However, despite several advances, these techniques are still not mature, and their high cost and system complexity continue to limit their applications. In this article, the techniques for achieving a practical imaging system with a compact THz transceiver are addressed, while considering the limitations of the current technique. The aim is to provide a brief review of related topics, while also covering our recent progress, which can provide some general perspectives and contrasting approaches for realizing a practical THz imaging system. The continuous wave devices are mainly focused for their flexibility of balancing the imaging resolution and data acquisition time. The importance of transceiver integration is also discussed and illustrated by introducing a 600-GHz band micro-photonic interface for integrating a THz source and detector, with a single resonant tunneling diode as a transceiver. With regard to system issues, spatial sampling with mechanical beam-scanning is discussed as an intermediate approach for moving stage and array technology. The potential and limitations of this approach are evaluated, along with an elliptical reflector as an alternative to an f-theta lens owing to its low cost and simplicity. The combination of integrated devices, along with the mechanical beam-scanning, is also discussed for demonstrating our current concept of realizing a practical THz imaging system.