研究者詳細 - 村手　宏輔

論文 - 村手　宏輔

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Single-shot up-conversion terahertz spectrometer with high frequency resolution 査読有り国際共著

S. Mine, J. E. Nkeck, J. Lafrenière-Greig, G. Gandubert, K. Murate, and F. Blanchard

OPTICA 12 巻 ( 2 ) 頁： 239 - 245 2025年2月

Terahertz parametric detection using a lithium tantalate 査読有り

Sota Mine, Shiki Tanaka, Kodo Kawase, and Kosuke Murate

Optics Letters 50 巻 ( 2 ) 頁： 527 - 529 2025年1月

THz波を用いた遮蔽物越しのシングルピクセル分光イメージング招待有り

村手宏輔, 種谷知樹，嶺颯太，川瀬晃道

月刊OPTRONICS ( 9 ) 頁： 72 - 77 2024年9月

Broadband heterodyne electro-optic sampling using a lithium niobate ridge-waveguide 査読有り国際共著

S. Mine, G. Gandubert, J. Nkeck, X. Ropagnol, K. Murate, F. Blanchard

Applied Physics Express 2024年4月

Collinear injection-seeded terahertz parametric generator 査読有り国際誌

S. Mine, N. Yamamoto, K. Kawase, and K. Murate

APL Photonics 9 巻 ( 3 ) 頁： 036103 2024年3月

Cascaded Terahertz Parametric Generation Under Noncollinear Phase-Matching Condition 査読有り

S. Mine, K. Kawase, K. Murate

45 巻 ( 1-2 ) 頁： 116 - 123 2024年1月

Pulse Burst Multiwavelength Terahertz-Wave Spectroscopic Measurement Using Parametric Wavelength Conversion 査読有り国際誌

Murate K., Kawaguchi R., Hayashi S., Kawase K.

IEEE Transactions on Terahertz Science and Technology 13 巻 ( 5 ) 頁： 561 - 564 2023年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEEE Transactions on Terahertz Science and Technology

In this study, we developed a multiwavelength spectroscopic measurement system using a pulse burst-pumped injection-seeded terahertz (THz)-wave parametric generator (is-TPG). Real-time spectroscopy using multiwavelength simultaneous generation has been demonstrated; however, the ability to make quantitative measurements with this method has been limited by the gain competition between wavelengths. In this study, we divided the pump beam into multiple paths and created pulse bursts with nanosecond intervals via spatial delays. Quasi-multiwavelength simultaneous generation was achieved by generating different THz wavelengths with each pulse; in principle, this is equal to repetitive single-wavelength generation. The gain competition between multi-wavelengths was suppressed compared to the multiwavelength is-TPG pumped by a single-pump pulse. Pulse-burst pumping improved the 'quantitativeness' of real-time spectroscopic measurements using an is-TPG and is expected to expand the scope of THz wave applications.

DOI： 10.1109/TTHZ.2023.3286664

Scopus

Terahertz Parametric Generators and Detectors for Nondestructive Testing Through High-Attenuation Packaging Materials 招待有り査読有り国際誌

Murate Kosuke, Mine Sota, Kawase Kodo

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 29 巻 ( 5 ) 2023年9月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IEEE Journal of Selected Topics in Quantum Electronics

Here, we introduce an injection-seeded terahertz (THz)-wave parametric generator (is-TPG) spectroscopic system and its application to nondestructive inspection through a packaging material with high attenuation. Recent technological innovations have dramatically improved is-TPG output. Combined with THz parametric detection, whereby detection is performed in the reverse process of generation, a spectrometer with an extremely high dynamic range has been achieved. THz spectroscopic imaging has enabled the previously difficult visualization of substance spatial distributions, even through thick packaging materials. Moreover, the introduction of machine learning has improved the accuracy of identification. High-speed wavelength tuning and multi-wavelength generation enable real-time acquisition of sample information and real-time identification by image recognition, thus broadening the range of applicability of the is-TPG. Additionally, detection sensitivity has improved to a level of < 1 aJ through multi-stage THz parametric detection. The system combining is-TPG and THz parametric detection now exhibits a dynamic range of 125 dB, enabling imaging through thick, high scattering materials with an attenuation factor of -100 dB; to our knowledge, such measurements are difficult to achieve with other THz-wave systems.

DOI： 10.1109/JSTQE.2023.3296989

Web of Science

Scopus

Wide dynamic range and real-time reagent identification and imaging using multi-wavelength terahertz parametric generation and machine learning 査読有り国際誌

Murate Kosuke, Mine Sota, Torii Yuki, Inoue Hyuga, Kawase Kodo

SCIENTIFIC REPORTS 13 巻 ( 1 ) 頁： 12743 2023年8月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Scientific Reports

In this study, we propose a technique for identifying and imaging reagents through shielding over a wide dynamic range using a real-time terahertz (THz) spectroscopy system with multi-wavelength THz parametric generation/detection and machine learning. To quickly identify reagents through shielding, the spectral information of the “detection Stokes beam” is used for reagent recognition via machine learning. In general THz wave-based reagent identification, continuous spectra are acquired and analyzed quantitatively by post-processing. In actual applications, however, such as testing for illicit drugs in mail, the technology must be able to quickly identify reagents as opposed to quantifying the amount present. In multi-wavelength THz parametric generation/detection, THz spectral information can be measured instantly using a “multi-wavelength detection Stokes beam” and near-infrared (NIR) camera. Moreover, machine learning enables reagent identification in real-time and over a wide dynamic range. Furthermore, by plotting the identification results as pixel values, the spatial distribution of reagents can be imaged at high speed without the need for post-processing.

DOI： 10.1038/s41598-023-40013-y

Web of Science

Scopus

PubMed

Efficient Terahertz Parametric Source Using Flat Pump Beam 査読有り

S. Mine, M. Abe, K. Kawase, K. Murate

IEEE Transactions on Terahertz Science and Technology 13 巻 ( 2 ) 頁： 153 - 157 2023年3月

テラヘルツ光を用いた遮蔽物内薬物の分光イメージング招待有り査読有り

村手宏輔, 川瀬晃道

光学 51 巻 ( 9 ) 頁： 393 - 399 2022年9月

Multi-Wavelength Terahertz Parametric Generator Using a Seed Laser Based on Four-Wave Mixing 査読有り

S. Mine, K. Kawase, and K. Murate

Photonics 9 巻 ( 4 ) 頁： 258 - 258 2022年4月

Terahertz Spectroscopy Applied to Estimation of Firing Temperatures of Ancient Ceramics 査読有り

Niijima S., Taniguchi H., Murate K., Kawase K.

IEEE Transactions on Terahertz Science and Technology 12 巻 ( 3 ) 頁： 300 - 306 2022年4月

Noise-free terahertz-wave parametric generator. 査読有り

Mine S, Kawase K, Murate K

Optics letters 47 巻 ( 5 ) 頁： 1113 - 1116 2022年3月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Optics Letters

We achieved noise-free terahertz (THz)-wave output from an injection-seeded THz-wave parametric generator (is-TPG) employing high-power injection seeding. A conventional is-TPG uses a weak continuous-wave (CW) seed beam. The position in which broadband noise is generated (via spontaneous parametric down-conversion) and the position of the THz signal overlap. Thus, the output features broadband TPG noise, reducing the signal-to-noise ratio. To solve this problem, we shifted the position in which the THz signal is generated to the front of the crystal; we separated the signal from broadband TPG noise using a high-powered, pulsed seed beam that was 107-fold more powerful than the CW seed beam. Thus, we extracted only the THz signal; we achieved a noise-free is-TPG. This system features a signal-to-noise ratio of 95 dB, approximately 40 dB better than the signal-to-noise ratio of the conventional system.

DOI： 10.1364/OL.448636

Scopus

PubMed

Application of Machine Learning to Terahertz Spectroscopic Imaging of Reagents Hidden by Thick Shielding Materials 査読有り

K. Murate, H. Kanai, K. Kawase

IEEE Transactions on Terahertz Science and Technology 11 巻 ( 6 ) 頁： 620 - 625 2021年7月

Real-time wide dynamic range spectrometer using a rapidly wavelength-switchable terahertz parametric source 査読有り

Mine Sota, Kawase Kodo, Murate Kosuke

OPTICS LETTERS 46 巻 ( 11 ) 頁： 2618 - 2621 2021年6月

Effects of the crystal phase and microstructure of pottery bodies on the transmission characteristics of terahertz waves 査読有り

Seiji Niijima, Hiroaki Taniguchi, Hideki Matsuda, Noritsugu Hashimoto, Kosuke Murate, Kodo Kawase

Journal of Asian Ceramic Societies 9 巻 2021年3月

High-power ASE-free fast wavelength-switchable external cavity diode laser 査読有り

Sota Mine, Kodo Kawase, and Kosuke Murate

Applied Optics 60 巻 ( 7 ) 頁： 1953 - 1957 2021年3月

Highly sensitive multi-stage terahertz parametric detector 査読有り

H. Sakai, K. Kawase, and K. Murate

Optics Letters 45 巻 ( 14 ) 頁： 3905 - 3908 2020年7月

Six-Billion-Fold Amplification via a Two-Stage Terahertz Parametric Amplifier 査読有り

K. Murate, H. Sakai, K. Kawase

IEEE Transactions on Terahertz Science and Technology 10 巻 ( 2 ) 頁： 200 - 203 2020年3月

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論文 - 村手　宏輔