2023 Fiscal Year Final Research Report
Laser control of matter via mode-selective vibrational excitation
| Project/Area Number |
20K20556
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| Research Category |
Grant-in-Aid for Challenging Research (Pioneering)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 30:Applied physics and engineering and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2020-07-30 – 2024-03-31
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| Keywords | 超短パルスレーザー / 赤外電磁波 / 分子振動 |
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| Outline of Final Research Achievements |
The aim of this study was to lay the scientific foundations for 'mode-selective vibrational excitation' by infrared pulsed lasers and to explore its potential applications in materials manipulation. First, theoretical analysis enabled the prediction of multi-step vibrational excitation depending on the electric field waveform and fluence of the IR pulses. Next, multi-step vibrational excitation by mid-infrared pulses was achieved for carbon dioxide molecules. Specifically, the first excitation up to quantum number 9 was achieved for the antisymmetric stretching vibrational mode of carbon dioxide in the liquid phase, and the multi-step vibrational and rotational excitation and rotational wave packet generation in carbon dioxide in the gas phase were also successfully achieved. As described above, it was demonstrated that waveform-shaping infrared pulses can be used for advanced vibrational excitation and contributed to the development of potential applications in materials manipulation.
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| Free Research Field |
量子エレクトロニクス
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は，赤外超短パルスレーザーの波形整形により，分子振動モードを選択的にかつ強く駆動できることを実証した．また，振動回転の多段階励起も可能であることを示した．このことは，赤外光が分子センシングに有用であるだけでなく，分子の振動を積極的に駆動するツールとして有用であることを示した，という意義をもつ．と同時に，加熱によって化学反応を促進する従来のアプローチと異なり，「所望の反応に関わる振動モードを選択的に励起して反応を促進する」というモード選択的化学へ向けて，その礎となる技術を開発した，という意義を有する．以上の通り，波形整形赤外光による物質操作への道を開く，重要な成果と言える．
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