| Project/Area Number |
23K13681
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 30020:Optical engineering and photon science-related
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
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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| Project Period (FY) |
2023-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2024: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2023: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | THz time domain / Rapid data acquisition / Terahertz / Near-field spectroscopy / Rapid measurement system |
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| Outline of Research at the Start |
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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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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