600-GHz-Band Terahertz Imaging System Using Frequency-Independent Concave Mirror

Kaname, Ryohei; Sagisaka, Tomoki; Yi, Li; Nagatsuma, Tadao

doi:10.23919/mwp48676.2020.9314504

Cited by 4 publications

(7 citation statements)

References 11 publications

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“…The source points for both mirrors were placed away from the focal point for scanning. It is seen that the focused beam size of the designed concave mirror is much smaller than that of the conventional ellipsoid mirror, which corresponds to the experimental results of horizontal and vertical resolutions of ~2 and ~0.7 mm, respectively [42]. The designed elliptical reflector supports an imaging speed of 0.1 m/s with an imaging width of ~12 cm.…”

Section: ) Simplified Elliptical Reflector For Mechanical Beamscanningsupporting

confidence: 69%

“…To arrive at a balance between cost and data acquisition speed, systems that use mechanical beam-scanning are mainly addressed in Section III. A simplified quasi-optic system with only one elliptical reflector is demonstrated together with a single RTD for realizing a cost-effective 2D imaging system [42]. The last section provides a conclusion and prospects for terahertz imaging techniques for related applications.…”

Section: Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceivermentioning

confidence: 99%

“…3(a) and a 2D moving stage. The spatial resolution of ~1 mm was measured experimentally by using knife edge method [42]. The text on the surface of the coin could be imaged clearly as it is shown in Fig.…”

Section: ) Integration To a Single Devicementioning

confidence: 99%

“…Previously, such systems were realized with electronic radar techniques, where only the centimeter order range resolution were achieved due to the limited bandwidth [24], [87], [89]. With the advances of accessing wider bandwidth for 3D imaging, some applications was demonstrated with the designed elliptical reflector [42]. A THz tag consists of twodimensional photonic crystal slabs placed in a matrix, where each slab has its own absorption frequency [85].…”

Section: ) Simplified Elliptical Reflector For Mechanical Beamscanningmentioning

confidence: 99%

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Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Nishida

Sagisaka

et al. 2021

J. Lightwave Technol.

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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.

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Section: ) Simplified Elliptical Reflector For Mechanical Beamscanningsupporting

confidence: 69%

Section: Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceivermentioning

confidence: 99%

Section: ) Integration To a Single Devicementioning

confidence: 99%

Section: ) Simplified Elliptical Reflector For Mechanical Beamscanningmentioning

confidence: 99%

See 2 more Smart Citations

Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Nishida

Sagisaka

et al. 2021

J. Lightwave Technol.

Self Cite

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show abstract

“…Owing to the narrow THz beam from the horn antenna, the effective beam width was much smaller than the mirror aperture, which resulted in a reduced spatial resolution compared to that calculated using (4). This also occurs in many quasi-optic-based THz imaging systems [6], [7], [9]. Practically, a spatial resolution of ~1 mm can be obtained in the 300-GHz band.…”

Section: A Real and Synthetic Aperture Imagingmentioning

confidence: 87%

Ultra-Wideband Frequency Modulated Continuous Wave Photonic Radar System for Three-Dimensional Terahertz Synthetic Aperture Radar Imaging

Kaname

Mizuno

et al. 2022

J. Lightwave Technol.

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Three-dimensional (3D) imaging remains an expensive and challenging task in the THz band. In this study, a frequency-modulated continuous-wave photonic radar system was presented in the 300-GHz band, instead of using electronic-based devices. The proposed system can obtain a 6-dB bandwidth of 120 GHz to achieve a range resolution of ~1.1 mm. The frequency sweep linearity of a laser source was calibrated with respect to the imaging distance and range resolution, through which a maximum detectable distance of ~800 mm was achieved with the collimated beam. To obtain the desired 3D information, the synthetic aperture radar (SAR) technique was introduced to the proposed system to achieve 3D imaging, which was not bounded by the fixed focal distance of a focus lens. It can provide a spatial resolution of ~1.5 mm within a 3D imaging range up to ~300 mm. The potential and limitations of SAR imaging schemes are discussed based on the theoretical and experimental results.

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THz Imaging System with a Single Resonant Tunneling Diode Transceiver in 300-GHz Band

Mizuno

Kaname

Nishida

et al. 2022

2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

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600-GHz-Band Terahertz Imaging System Using Frequency-Independent Concave Mirror

Cited by 4 publications

References 11 publications

Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Ultra-Wideband Frequency Modulated Continuous Wave Photonic Radar System for Three-Dimensional Terahertz Synthetic Aperture Radar Imaging

THz Imaging System with a Single Resonant Tunneling Diode Transceiver in 300-GHz Band

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