2022 Fiscal Year Final Research Report
Generation of Vector Beams using Semiconductor Nanowires
| Project/Area Number |
20H02176
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 21050:Electric and electronic materials-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
冨岡 克広 北海道大学, 情報科学研究院, 准教授 (60519411)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 半導体ナノワイヤ / ベクトル光波 / 偏光 / ナノワイヤレーザ |
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| Outline of Final Research Achievements |
We carried out the characterization of emitted light from GaAs/InGaAs/GaAs core-multishell nanowires (NWs) under laser light excitation. Under continuously working excitation, multiple sharp peaks originating from the optical cavity were observed. Under pulsed excitation, sharp peaks were observed, and their intensity increased superlinearly with excitation intensity, which indicated laser oscillation in NWs. Direct observation of the spectrally filtered peak revealed that the beam shape was hollow, indicating the existence of the singularity in its beam center. Furthermore, polarization analysis showed that the lasing beam exhibited cylindrically symmetric distribution in the polarization. These experimental results are in good agreement with calculations and indicate that NWs are a promising candidate for a compact light source of the cylindrical vector beams.
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| Free Research Field |
半導体デバイス工学
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| Academic Significance and Societal Importance of the Research Achievements |
ベクトル光波は、通常の光波とは異なる光としての特徴を持ち、光マニュピレーション、光トラッピング、レーザ加工、超解像イメージング、光通信、量子光通信や粒子加速など、多岐に渡る分野での応用が期待されているが、一般的に発生方法が煩雑で、簡便は発光源の開発が求められている。本研究において、半導体ナノ構造として形成が容易な、断面寸法サブミクロン程度の微小なナノワイヤがレーザ発振すること、そしてレーザ発振時に軸対称ベクトル光波が発生可能であることを示した。これにより、ナノワイヤは小型のベクトル光波源としての可能性が示されるとともに、ベクトル光波の応用可能性を一段と高めている。
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