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

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 esp...

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Autores principales: Hiraoka, Tomoki, Inose, Yuta, Arikawa, Takashi, Ito, Hiroshi, Tanaka, Koichiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9243027/
https://www.ncbi.nlm.nih.gov/pubmed/35768420
http://dx.doi.org/10.1038/s41467-022-31071-3
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author Hiraoka, Tomoki
Inose, Yuta
Arikawa, Takashi
Ito, Hiroshi
Tanaka, Koichiro
author_facet Hiraoka, Tomoki
Inose, Yuta
Arikawa, Takashi
Ito, Hiroshi
Tanaka, Koichiro
author_sort Hiraoka, Tomoki
collection PubMed
description 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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spelling pubmed-92430272022-07-01 Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator Hiraoka, Tomoki Inose, Yuta Arikawa, Takashi Ito, Hiroshi Tanaka, Koichiro Nat Commun Article 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. Nature Publishing Group UK 2022-06-29 /pmc/articles/PMC9243027/ /pubmed/35768420 http://dx.doi.org/10.1038/s41467-022-31071-3 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Hiraoka, Tomoki
Inose, Yuta
Arikawa, Takashi
Ito, Hiroshi
Tanaka, Koichiro
Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator
title Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator
title_full Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator
title_fullStr Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator
title_full_unstemmed Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator
title_short Passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator
title_sort passive mode-locking and terahertz frequency comb generation in resonant-tunneling-diode oscillator
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9243027/
https://www.ncbi.nlm.nih.gov/pubmed/35768420
http://dx.doi.org/10.1038/s41467-022-31071-3
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