Integrated Terahertz Optics with Effective Medium for 600-GHz-band Imaging

Sagisaka, Tomoki; Kaname, Ryohei; Kikuchi, Masato; Kukutsu, Naoya; Headland, Daniel; Yi, Li; Fujita, Masayuki; Nagatsuma, Tadao

doi:10.23919/mwp48676.2020.9314570

Cited by 9 publications

(4 citation statements)

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“…For the THz source operated at 600 GHz, the focal depth was approximately 10 mm, which is usually insufficient for detecting objects with uncertain positions. However, the result is worse than that reported in [23] because a scannable lens, such as an f-theta lens, reduces the spatial resolution of the system. There are two main reasons for this result: first, the f-theta lens was not specifically designed for the 600 GHz band but was simulated according to certain assumptions about the optical domain; second, the optical alignment is very sensitive, and the resolution must be reduced to obtain the appropriate imaging aperture.…”

Section: Approach For Achieving a Longer Focal Depthcontrasting

confidence: 62%

“…A schematic diagram of the miniaturized THz imaging system and the integrated unit structure are shown in Figure 14a,b, respectively. A resonant tunneling diode (RTD) chip as a transmitter [33], an SBD chip as a receiver [34], and a beam splitter are integrated on a silicon wafer [23]. By introducing an integrated unit, our 600 GHz-band THz imaging scanner system can be miniaturized, which can increase its potential use in practical applications, such as security inspections.…”

Section: Discussionmentioning

confidence: 99%

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High-Speed 600 GHz-Band Terahertz Imaging Scanner System with Enhanced Focal Depth

Wang

Tonouchi

et al. 2022

Photonics

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Lenses/mirrors with fast data acquisition speeds and extended focal depths have practical importance in terahertz (THz) imaging systems. Thus, a high-speed 600 GHz-band THz imaging scanner system with enhanced focal depth is presented in this work. A polygon mirror with a 250 Hz scanning frequency and an integrated off-axis parabolic (OAP) mirror with an ~170 mm focal depth were employed for 2D imaging. The simulation and experimental results show that a spatial resolution of ~2 mm can be achieved as the imaging distance varies from ~85 to 255 mm. The proposed system was applied to image a hidden metal object as a potential security application, demonstrating that this system can image targets with an enhanced focal depth.

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Section: Approach For Achieving a Longer Focal Depthcontrasting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

High-Speed 600 GHz-Band Terahertz Imaging Scanner System with Enhanced Focal Depth

Wang

Tonouchi

et al. 2022

Photonics

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“…Since transceiver integration above the 300-GHz band still involves several problems, such as large losses and limited bandwidth of the waveguide, the concept of integrating the electronic and photonic components is introduced as an effective approach in this frequency band. This is illustrated by the examples of an integrated silicon micro-photonic unit operated at the 600-GHz band [40]. Instead of a conventional integration method, a further integrated resonant tunneling diode (RTD) transceiver device will also be addressed as an alternative integration technique for reducing the system cost [41].…”

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

confidence: 99%

“…While and were optimized via simulation for 23 and 15.6 micrometer, respectively. The details evaluation can be found in [40], while some imaging results and the imaging system are introduced in Section III A.…”

Section: B Integration Of Thz Transceiver 1) Integration At 600-ghz Band With Micro-photonic Interfacementioning

confidence: 99%

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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Miniaturized Maxwell Fisheye Lens for Terahertz Multibeam Luneburg lens Antenna

Guo

Wang

2022

2022 5th International Conference on Electronics and Electrical Engineering Technology (EEET)

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Integrated Terahertz Optics with Effective Medium for 600-GHz-band Imaging

Cited by 9 publications

References 0 publications

High-Speed 600 GHz-Band Terahertz Imaging Scanner System with Enhanced Focal Depth

High-Speed 600 GHz-Band Terahertz Imaging Scanner System with Enhanced Focal Depth

Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Miniaturized Maxwell Fisheye Lens for Terahertz Multibeam Luneburg lens Antenna

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