2023 Fiscal Year Research-status Report
Quantum-dot chiral lasers via bound state in the continuum for interferometric chirality sensing
| Project/Area Number |
23KF0107
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| Research Institution | The University of Tokyo |
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Principal Investigator |
J・J Delaunay 東京大学, 大学院工学系研究科(工学部), 准教授 (80376516)
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| Co-Investigator(Kenkyū-buntansha) |
XING DI 東京大学, 大学院工学系研究科(工学部), 外国人特別研究員
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| Project Period (FY) |
2023-07-26 – 2026-03-31
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| Keywords | metasurface / emission / polarization |
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| Outline of Annual Research Achievements |
Structures that support a bound-state-in-the-continuum (BIC) lasing mode on a photonic crystal were designed by simulation. These structures made of dielectric materials were patterned into nanocylinder arrays to support a resonance mode with a high-quality factor (quasi-BIC mode). Solution-processed quantum dots (QDs) were integrated on top of the nanocylinder array to form an isolated cavity. Due to the existence of side edges, the lasing mode is better confined within the cavity and shows lower scattering losses in the lateral direction. In summary, a single-mode BIC laser using CsPbBr3 QDs having a narrow linewidth of around 0.1 nm and a small footprint (10 × 10 μm^2) was demonstrated. This lasing structure is the smallest among the existing solution-processed BIC laser.
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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
Cavity structures supporting BIC lasing mode have been designed. Direct fabrication of well-defined patterns of quantum dots (QDs) via a solution process was proposed to take advantage of the pattern edges to reduce losses through the cavity edges. A miniaturized BIC laser (10 × 10 μm^2) with a low threshold has been demonstrated. The results were published in Advanced Functional Materials a leading journal in the field of nanotechnology.
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| Strategy for Future Research Activity |
We will break the symmetry of the employed nanostructures to produce a high Q factor chiral lasing emission. For this purpose, simulations and experimental verifications will be used to design and optimize the chiral structure. To characterize the experimental result, an angle-resolved spectrometer will be built. This setup can characterize the polarization properties of the far field emission in off normal direction. Finally, a chiral emission with a high Q factor will be demonstrated.
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