2022 Fiscal Year Annual Research Report
Quantum dot manipulation and photon emission control through metamaterial tweezers
| Project/Area Number |
22J10196
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| Allocation Type | Single-year Grants |
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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| Research Fellow |
Bouloumis Theodoros 沖縄科学技術大学院大学, 科学技術研究科, 特別研究員(DC2)
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| Project Period (FY) |
2022-04-22 – 2024-03-31
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| Keywords | Optical tweezers / Metamaterials / Plasmonics / Optical setup / Picosecond laser / Fluorescence |
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| Outline of Annual Research Achievements |
In this project, an optical trapping setup based on inverted microscope was used for investigating the optical properties of certain quantum emitters. The setup was modified by adding a picosecond laser for the excitation of the nanoparticles. The picosecond laser had a tunable wavelength from 480 nm to 750 nm and could serve our needs for exciting various quantum emitters with different absorption wavelengths. For collecting the emission from the emitters, we also added a part based on a telescope guiding the emitted light towards a multi-mode fiber that was connected to a spectrometer for the emission wavelength monitoring. We tested the proof of concept by depositing fluorescent nanoparticles on a glass slide, and placing it on the microscope holder. The excitation wavelength was tuned at 500 nm and the emission wavelength was measured at 570, in agreement with the specifications, therefore we have also been using this particles for calibrating the spectrometer. The main achievement of this project was the establishment of an experimental setup for simultaneous single-particle trapping on metamaterial plasmonic tweezers and fluorescence excitation of the trapped quantum emitters.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
There was a delay in the delivery of certain parts for the modification of the setup. In addition, the picosecond laser needed for the excitation of the particles was used by another member of the group so we had to allocate some time to both users.
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| Strategy for Future Research Activity |
The plan for next year was to collaborate with an organic chemistry group that could synthesize for us some quantum emitters based on our needs. We planned to trap these quantum emitters in water solution using metamaterial plasmonic tweezers. In addition, we wanted to excite the quantum emitters while being trapped and monitor their photoluminescence over time as they remain trapped.
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