High-quality THz OAM mode generation based on difference frequency generation

• Project/Area Number: 19K05299
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: Chiba University
• Principal Investigator: Miyamoto Katsuhiko 千葉大学, 大学院工学研究院, 准教授 (20375158)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: テラヘルツ / 光渦 / 軌道角運動量 / 非線形光学 / ベッセルビーム / 周波数可変 / 差周波発生

Outline of Research at the Start

本研究課題では、固有モード性を保ったテラヘルツ光渦を周波数可変かつ任意次数で発生させることが可能な、テラヘルツ光渦シンセサイザーの実現を目的としている。
光渦とは、位相が一意に決まらない位相特異点に起因した螺旋波面を有し、軌道角運動量・ドーナツ型強度分布といった特徴を持つ光の総称である。非線形波長変換を用いる本手法では、既存のテラヘルツ光渦の様な発生できる周波数と次数に制限を一切受けず、高いモード純度を達成できる。テラヘルツ光渦シンセサイザーは、物性研究の新たなツールとしての応用が期待される。

Outline of Final Research Achievements

We have demonstrated a widely tunable terahertz (THz) vortex generation based on difference frequency generation in combination with a 4’-dimethylamino-N-methyl-4-stilbazolium tosylate crystal pumped by 1.5μm dual-wavelength pump beams having Gaussian and optical vortex profiles. The generated THz vortex output exhibits a high-purity orbital angular momentum mode with a topological charge of LTHz = ± 1 in a frequency range of 2-6 THz. The maximum average power of the THz vortex output reached up to ~3.3μW at 4 THz.

Academic Significance and Societal Importance of the Research Achievements

非線形フォトニクスに立脚した本手法において、これまで実現できなかったテラヘルツ光渦の周波数可変性を実現した。さらに、軌道角運動量の高純度固有モードを各発生周波数において担保できる点が大きな利点として挙げられる。周波数可変高純度テラヘルツ光渦光源を用いる事で、軌道角運動量を主成分とした新奇テラヘルツ分光など、テラヘルツ領域における光物性研究への新たな応用展開が期待される。

Research Products

• [Journal Article] Tunable terahertz Bessel beams with orbital angular momentum (2022)
  • Author(s): Katsuhiko Miyamoto, Riku Nomura, Shohei Tsurumaru, Takashige Omatsu
  • Journal Title: Optics Continuum Volume: 1 Issue: 4 Pages: 633-640
  • DOI: 10.1364/optcon.452881
  • Peer Reviewed / Open Access
• [Journal Article] Tunable 2.3-3 μm optical vortex parametric laser (2022)
  • Author(s): Shutong Wang, Yusufu Tulake, Dulikun Sulaiman, Mairihaba Ababaike, Katsuhiko Miyamoto, Takashige Omatsu, Taximaiti Yusufu
  • Journal Title: Laser Physics Volume: 32 Issue: 4 Pages: 045001-045001
  • DOI: 10.1088/1555-6611/ac57b4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Broadband high-resolution terahertz single-pixel imaging (2020)
  • Author(s): Adam Valles, Jiahuan He, Seigo Ohno, Takashige Omatsu, Katsuhiko Miyamoto
  • Journal Title: Optics Express Volume: 28 Issue: 20 Pages: 28868-28881
  • DOI: 10.1364/oe.404143
  • Peer Reviewed / Open Access
• [Journal Article] Zero-spindle spectral drill: real-time spectral measurement in a fixed Fabry-Perot cavityavity (2020)
  • Author(s): Seigo Ohno, Katsuhiko Miyamoto, Shin'ichiro Hayashi, Norihiko Sekine
  • Journal Title: Optics Express Volume: 28 Issue: 15 Pages: 22088-22094
  • DOI: 10.1364/oe.397238
  • Peer Reviewed / Open Access
• [Journal Article] Ultraviolet intracavity frequency-doubled Pr3+:LiYF4 orbital Poincare laser (2020)
  • Author(s): A. Srinivasa Rao, Katsuhiko Miyamoto, Takashige Omatsu
  • Journal Title: Optics Express Volume: 28 Issue: 25 Pages: 37397-37405
  • DOI: 10.1364/oe.411624
  • Peer Reviewed / Open Access
• [Journal Article] Tunable near- and mid-infrared (1.36?1.63 μm and 3.07?4.81 μm) optical vortex laser source (2020)
  • Author(s): Sujian Niu, Shutong Wang, Mairihaba Ababaike, Taximaiti Yusufu, Katsuhiko Miyamoto, Takashige Omatsu
  • Journal Title: Laser Physics Letters Volume: 17 Issue: 4 Pages: 045402-045402
  • DOI: 10.1088/1612-202x/ab7dcf
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Twisted mass transport enabled by the angular momentum of light (2020)
  • Author(s): Takashige Omatsu, Keigo Masuda, Katsuhiko Miyamoto, Kohei Toyoda, Natalia M Litchinitser, Yoshihiko Arita, Kishan Dholakia
  • Journal Title: Journal of Nanophotonics Volume: 14 Issue: 01 Pages: 010901-010901
  • DOI: 10.1117/1.jnp.14.010901
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Generation of high-quality terahertz OAM mode based on soft-aperture difference frequency generation (2019)
  • Author(s): Katuhiko Miyamoto, Kazuki Sano, Takahiro Miyakawa, Hiromasa Niinomi, Kohei Toyoda, Adam Valles, Takashige Omatsu
  • Journal Title: Optics Express Volume: 27 Issue: 22 Pages: 31840-31840
  • DOI: 10.1364/oe.27.031840
  • Peer Reviewed / Open Access
• [Journal Article] Generation of coupled orbital angular momentum modes from an optical vortex parametric laser source (2019)
  • Author(s): Roukuya Mamuti, Shunsuke Goto, Katsuhiko Miyamoto, Takashige Omatsu
  • Journal Title: Optics Express Volume: 27 Issue: 25 Pages: 37025-37025
  • DOI: 10.1364/oe.27.037025
  • Peer Reviewed / Open Access
• [Presentation] High-resolution terahertz single-pixel imaging for 2D spectral analysis (2021)
  • Author(s): A. Valles, S. Ohno, T. Omatsu, K. Miyamoto
  • Organizer: 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
  • Int'l Joint Research
• [Presentation] Generation of tunable terahertz Bessel beam with a Tsurupica Axicon lens (2021)
  • Author(s): R. Nomura, K. Miyamoto, T. Omatsu
  • Organizer: JSAP-OSA Joint Symposia
  • Int'l Joint Research
• [Presentation] ピコ秒パルス励起によるリッジ形状PPLNからの差周波THz波発生 (2021)
  • Author(s): 浜崎 淳一、岸本 直、関根 紀彦、野村 陸、宮本 克彦、尾松 孝茂、寶迫 巌
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] テラヘルツ高次ベッセルビームの発生 (2021)
  • Author(s): 野村陸, 宮本克彦, 尾松孝茂
  • Organizer: Optics & Photonics Japan 2021
• [Presentation] 有機非線形光学結晶における熱レンズ効果 (2021)
  • Author(s): 井上一馬, 宮本克彦, 尾松孝茂
  • Organizer: Optics & Photonics Japan 2021
• [Presentation] テラヘルツ多次元顕微分光システム (2021)
  • Author(s): 辻将太, 野村陸, 大野誠吾, Adam Valles, Peter Kruger, 松浦彰, 宮本克彦, 尾松孝茂
  • Organizer: Optics & Photonics Japan 2021
• [Presentation] テラヘルツ波高次ベッセルビームの発生 (2021)
  • Author(s): 野村陸, 宮本克彦, 尾松孝茂
  • Organizer: テラヘルツ科学の最先端VIII
• [Presentation] 軌道角運動量を有した周波数可変テラヘルツ高次ベッセ ルビーム (2021)
  • Author(s): 辻 将太, 野村 陸, 宮本 克彦, 尾松 孝茂
  • Organizer: 第69回応用物理学会春季学術講演会
• [Presentation] Broadband terahertz single pixel imaging system (2020)
  • Author(s): Adam Valles, Jiahuan He, Taisei Ookawa, Seigo Ohno, Katsuhiko Miyamoto, Takashige Omatsu
  • Organizer: SPIE Structured Light at OPIC, Optical Manipulation and Structured Materials Conference
  • Int'l Joint Research
• [Presentation] テラヘルツ領域における周波数可変高次光渦の発生 (2020)
  • Author(s): 鶴丸将平，戸部雄輝， 野村 陸，井上一馬，辻 将太，宮本克彦，尾松孝茂
  • Organizer: 第38回レーザセンシングシンポジウム
• [Presentation] High pixel resolution terahertz imaging (2020)
  • Author(s): Adam Valles, Seigo Ohno, Takashige Omatsu, Katsuhiko Miyamoto
  • Organizer: シンポジウム「テラヘルツ科学の最先端VII」
• [Presentation] ツルピカアキシコンレンズによるテラヘルツ波ベッセルビーム発生 (2020)
  • Author(s): 野村 陸、鶴丸 将平、辻 将太、戸部 雄輝、井上 一馬、宮本 克彦、尾松 孝茂
  • Organizer: 第68回 応用物理学会春季学術講演会
• [Presentation] 非線形フォトニクスに立脚した光渦の発生 (2020)
  • Author(s): 宮本克彦、尾松孝茂
  • Organizer: レーザー学会学術講演会, 第40回年次大会
  • Invited
• [Presentation] 赤外・テラヘルツ域の光渦発生とその応用 (2019)
  • Author(s): 宮本克彦、尾松孝茂
  • Organizer: 日本光学会年次学術講演会Optics&Photonics Japan (OPJ 2019)
  • Invited
• [Presentation] Frequency-versatile terahertz vortex generation (2019)
  • Author(s): Katsuhiko Miyamoto, Takashige Omatsu
  • Organizer: The 5th International Symposium on Microwave/THz science and Applications (MTSA 2019)
  • Int'l Joint Research / Invited
• [Presentation] Highly intense THz vortex generation and its applications (2019)
  • Author(s): Katsuhiko Miyamoto, Fabian Rotermund, Takashige Omatsu
  • Organizer: The 7th Advanced Electromagnetics Symposium (AES 2019)
  • Int'l Joint Research / Invited