scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

Electrical Control of Mode-Locked Resonant Tunneling Diode Terahertz Oscillators

28 Aug 2022-pp 1-4
TL;DR: In this paper , the authors demonstrated electrical control of the repetition frequency and offset frequency of RTD terahertz oscillators by bias voltage modulation, which can pave the way for the realization of a stabilized frequency comb using RTD oscillators that operate at room-temperature.
Abstract: We experimentally demonstrated electrical control of the repetition frequency and offset frequency of mode-locked resonant tunneling diode (RTD) terahertz oscillators by bias voltage modulation. These results will pave the way for the realization of stabilized terahertz frequency comb using RTD oscillators that operate at room-temperature.
References
More filters
Journal ArticleDOI
TL;DR: In this paper, a Fermi-level managed barrier (FMB) diode was used for the first time for the heterodyne detection of terahertz waves.
Abstract: A Fermi-level managed barrier (FMB) diode was used for the heterodyne detection of terahertz waves for the first time. A quasi-optical module integrating an FMB diode and a broadband trans-impedance amplifier exhibited an intermediate frequency bandwidth of 11 GHz. A very low noise-equivalent-power of 1.1 × 10−18 W/Hz was achieved at ∼300 GHz with a very low local oscillator power of 6 × 10−6 W.

33 citations

Journal ArticleDOI
23 Feb 2021
TL;DR: In this paper, the injection-locking properties of a resonant-tunneling-diode terahertz oscillator in the small-signal injection regime with a frequency-stabilized continuous THz wave were investigated.
Abstract: We studied the injection-locking properties of a resonant-tunneling-diode terahertz oscillator in the small-signal injection regime with a frequency-stabilized continuous THz wave. The linewidth of the emission spectrum dramatically decreased to less than 120 mHz (half width at half maximum) from 4.4 MHz in the free running state as a result of the injection locking. We experimentally determined the amplitude of injection voltage at the antenna caused by the injected THz wave. The locking range was proportional to the injection amplitude and consistent with Adler’s model. While increasing the injection amplitude, we observed a decrease in the noise component of the power spectrum, which manifests the free-running state, and an alternative increase in the injection-locked component. The noise component and the injection-locked component had the same power at the threshold injection amplitude as small as 5 × 10−4 of the oscillation amplitude. This threshold behavior can be qualitatively explained by Maffezzoni’s model of noise reduction in general limit-cycle oscillators.

10 citations

Proceedings ArticleDOI
01 Sep 2020
TL;DR: In this article, two types of practical plastic packages are proposed for practical terahertz applications by using a plastic leaded chip carrier (PLCC), and also by embedding a parabolic antenna.
Abstract: The two types of practical plastic packages are proposed in this study for practical terahertz applications by using a plastic leaded chip carrier (PLCC), and also by embedding a parabolic antenna. A resonant tunneling diode (RTD) oscillator onto the top surface of which a dipole antenna is integrated is mounted in the packages to measure the radiation characteristics. The antenna gain is improved by 5 dB for the PLCC, while 17 dB for the parabolic-antenna type, compared to that of the RTD bare chip. The team also fabricates terahertz-imaging modules by utilizing PLCC-packaged RTD's as an oscillator and a detector. A perspective image obtained by line-scan with 1.25-mm pixel pitch elucidates the usefulness of the package.

10 citations