600-GHz-band Terahertz Imaging Scanner System with Enhanced Focal Depth

Yaheng Wang, L. Yi, M. Tonouchi, T. Nagatsuma
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引用次数: 2

Abstract

Long focal depth property of lens/mirrors is of practical importance in terahertz (THz) imaging systems where the sample position is usually uncertain. A 600-GHz-band THz imaging scanner system using an integrated off-axis parabolic (OAP) mirror is presented for this requirement. Both simulation and experiment results show that a spatial resolution of ~2 mm can be achieved at a focal distance of 100 mm. Moreover, owing to the astigmatism of the proposed OAP mirror, a long focal depth of ~170 mm was validated with the imaging experiment. Finally, a real imaging experiment was provided for recognizing the hidden metal object, which can be potentially used for imaging targets at different distances.
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增强焦深度的600 ghz波段太赫兹成像扫描仪系统
在样品位置不确定的太赫兹成像系统中,透镜/反射镜的长焦深特性具有重要的实际意义。针对这一需求,提出了一种使用集成离轴抛物面(OAP)反射镜的600 ghz波段太赫兹成像扫描仪系统。仿真和实验结果表明,在焦距为100 mm的情况下,可获得~2 mm的空间分辨率。此外,由于所提出的OAP镜存在散光,通过成像实验验证了~170 mm的长焦深。最后,提供了一个真实的金属目标识别成像实验,为不同距离的目标成像提供了可能。
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