| 研究課題/領域番号 |
22K14623
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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 |
Fong CheeFai 国立研究開発法人理化学研究所, 開拓研究本部, 基礎科学特別研究員 (30881544)
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| 研究期間 (年度) |
2022-04-01 – 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 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2023年度: 2,080千円 (直接経費: 1,600千円、間接経費: 480千円)
2022年度: 2,600千円 (直接経費: 2,000千円、間接経費: 600千円)
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| キーワード | 2D materials device / Photonic crystal / Optics and photonics / photonic crystal / optics and photonics / Valley spin devices / semiconductor / layered material |
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| 研究開始時の研究の概要 |
In 2D semiconductors, the electron and holes possess coupled valley and spin properties which are referred to as valley spin. We propose the demonstration of valley spin devices by coupling 2D semiconductors to novel circularly polarized chiral photonic crystal nanocavities.
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| 研究実績の概要 |
Using the photonic crystal (PhC) and 2D materials transfer technologies that we have developed previously, in this fiscal year, we have been focused on studying the self-aligned hybrid nanocavities. These hybrid nanocavities are formed by partially covering a photonic crystal waveguide post-fabrication with a suitably-sized 2D material flake. The presence of the flake increases the local refractive index causing a frequency mismatch of the optical fields in the regions with and without the flake results in the formation of a nanocavity. We successfully fabricated such hybrid nanocavity devices with hBN, WSe2 and MoTe2 flakes on silicon PhC waveguides.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
In our hybrid nanocavity devices, we have obtained Q factors as high as 4.0×10^5. Remarkably, even monolayer flakes can provide sufficient local refractive index modulation to induce high Q nanocavity formation. We have also managed to observe cavity PL enhancement in a self-aligned MoTe2 cavity device, with a cavity Purcell enhancement factor of about 15. Our results highlight the potential of our devices to enhance light-matter coupling and to create functional optical devices.
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| 今後の研究の推進方策 |
So far, we have fabricated hybrid nanocavities using a single flake per device. One of the key features of 2D materials is their amenability to heterogenous stacking i.e. stacking of 2D materials with different compositions and atomic lattices without having to worry about lattice matching. Such heterogeneous stacking has been used as encapsulation or passivation layer to sandwich and protect the 2D materials. Following from our results, our next step will be focused on coupling heterogenous stack of materials to the self-aligned hybrid nanocavities.
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