| 研究課題/領域番号 |
23K13681
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分30020:光工学および光量子科学関連
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| 研究機関 | 国立研究開発法人理化学研究所 |
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研究代表者 |
BALGOS MARIAHERMINIA 国立研究開発法人理化学研究所, 光量子工学研究センター, 特別研究員 (20971386)
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| 研究期間 (年度) |
2023-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
3,510千円 (直接経費: 2,700千円、間接経費: 810千円)
2024年度: 780千円 (直接経費: 600千円、間接経費: 180千円)
2023年度: 2,730千円 (直接経費: 2,100千円、間接経費: 630千円)
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| キーワード | THz time domain / Rapid data acquisition / Terahertz / Near-field spectroscopy / Rapid measurement system |
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| 研究開始時の研究の概要 |
I will build a rapid hyperspectral imaging system with nano-scale spatial and sub-ps scale temporal resolution (Year 1) to study the carrier dynamics in GaAs photoconductive antenna (Year 2).
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| 研究実績の概要 |
In this fiscal year, a reflection-type terahertz time-domain spectroscopy setup based on photoconductive antenna emitter and detector was constructed. Since the pre-requisite for using the frictionless delay stage is fast data sampling, a scheme for rapid data acquisition per point when detecting the THz signal via lock-in amplifier was developed. Using an electro-optic pulse picker, the signal was modulated at a maximum of 40 MHz, which is half the input laser repetition rate, resulting in 100x faster acquisition rates than in conventional systems using chopper. The system can monitor a signal that varies as fast as 10 kHz and reduced the acquisition time for one spectrum from more than one minute to 1.6 s. The assembly of qplus sensors for scanning probe microscopy was also started.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The project has so far progressed according to the schedule. The terahertz spectroscopy has been developed in this year and we were able to confirm rapid signal detection. To accommodate the SPM head, the system is setup in a reflection geometry. The qPlus sensor assembly was also successfully done as well as the initial alignment for nearfield measurements. However, additional optical elements are necessary for efficient coupling of THz to the SPM head.
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| 今後の研究の推進方策 |
In the coming fiscal year, I will optimize the alignment optics for nearfield experiments. Based on last year's progress, the detection optics of THz needs additional stirring mirror for more efficient collection of THz when the SPM head is coupled to the THz beam. Since the rapid detection using a slow mechanical delay stage is already confirmed, I can proceed with the use of the fast delay stage. Lastly, I will investigate plasmonic effect on THz emission at the nearfield from the target sample.
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