Injection locking and noise reduction of resonant tunneling diode terahertz oscillator

Hiraoka, Tomoki; Arikawa, Takashi; Yasuda, Hiroaki; Inose, Yuta; Sekine, Norihiko; Hosako, Iwao; Itô, Hiroshi; Tanaka, Kōichiro

doi:10.1063/5.0033459

Cited by 13 publications

(7 citation statements)

References 34 publications

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“…Despite the bandwidth issue mentioned above, the mechanism of such properties has not yet been clearly explained. The physical exploration of such devices is still underway [73], [92], [93] for generalizing their applications. We believe that a compact transceiver is the key feature of THz device, which make it possible for mounting in different devices such as phones and micro-drone for widening the application of THz imaging techniques.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Nishida

Sagisaka

et al. 2021

J. Lightwave Technol.

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show abstract

“…The measurement part is basically the same as that used in our previous study 43 . The local oscillator (LO) signal was a frequency-stabilized CW terahertz wave.…”

Section: Methodsmentioning

confidence: 99%

Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator

et al. 2022

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Optical frequency combs in the terahertz frequency range are long-awaited frequency standards for spectroscopy of molecules and high-speed wireless communications. However, a terahertz frequency comb based on a low-cost, energy-efficient, and room-temperature-operating device remains unavailable especially in the frequency range of 0.1 to 3 THz. In this paper, we show that the resonant-tunneling-diode (RTD) oscillator can be passively mode-locked by optical feedback and generate a terahertz frequency comb. The standard deviation of the spacing between the comb lines, i.e., the repetition frequency, is reduced to less than 420 mHz by applying external bias modulation. A simulation model successfully reproduces the mode-locking behavior by including the nonlinear capacitance of RTD and multiple optical feedback. Since the mode-locked RTD oscillator is a simple semiconductor device that operates at room temperature and covers the frequency range of 0.1 to 2 THz (potentially up to 3 THz), it can be used as a frequency standard for future terahertz sensing and wireless communications.

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“…The measurement part is basically the same as that used in our previous study [39] We should note that there would be some inaccuracy in the measured amplitude. The sensitivity of the measurement system might have some frequency dependence because of standing waves forming [41] between the oscillator and the detector.…”

Section: Methodsmentioning

confidence: 99%

Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator

Hiraoka

Inose

Arikawa

et al. 2021

Preprint

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Optical frequency combs in the terahertz frequency range are long-awaited frequency standards for spectroscopy of molecules and high-speed communications. However, a terahertz frequency comb based on a compact, efficient and room-temperature-operating device remains unavailable especially in the frequency range of 0.1 to 3 THz. In this paper, we show that the resonant-tunneling-diode oscillator can be passively mode-locked by optical feedback and generate a terahertz frequency comb. The standard deviation of the spacing between the comb lines, i.e., the repetition frequency, is reduced to less than 420 mHz by applying external bias modulation. A simulation model successfully reproduces the mode-locking behavior by including the nonlinear capacitance of RTD and multiple optical feedback. Since the mode-locked RTD oscillator is a simple semiconductor device that operates at room temperature and covers the frequency range of 0.1 to 3 THz, it can be used as a frequency standard for future terahertz sensing and communications.

show abstract

Injection locking and noise reduction of resonant tunneling diode terahertz oscillator

Cited by 13 publications

References 34 publications

Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Towards Practical Terahertz Imaging System With Compact Continuous Wave Transceiver

Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator

Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator

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