【公開日：2025.06.10】【最終更新日：2025.05.09】
課題データ / Project Data
課題番号 / Project Issue Number
24HK0024
利用課題名 / Title
Characterization of quantum coherence using a doped modal strong coupling system
利用した実施機関 / Support Institute
北海道大学 / Hokkaido Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）加工・デバイスプロセス/Nanofabrication（副 / Sub）計測・分析/Advanced Characterization
【重要技術領域 / Important Technology Area】（主 / Main）量子・電子制御により革新的な機能を発現するマテリアル/Materials using quantum and electronic control to perform innovative functions（副 / Sub）-
キーワード / Keywords
量子効果/ Quantum effect,ALD,電子線リソグラフィ/ EB lithography,電子顕微鏡/ Electronic microscope,フォトニクス/ Photonics,スパッタリング/ Sputtering
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
劉 言恩
所属名 / Affiliation
北海道大学 電子科学研究所
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
HK-404：超高分解能電界放出形走査電子顕微鏡
HK-603：超高速スキャン電子線描画装置(130kV)
HK-609：ヘリコンスパッタリング装置
HK-611：多元スパッタ装置
HK-617：原子層堆積装置（粉末対応型）
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Investigating the quantum efficiency of hot-electron transfer and photoemission characteristics of Au-nanodisk-nanotriangle-mixed-structures (Au-NDTms)/TiO2/Au-film (ATA) to understand the mechanisms of quantum coherence and identify key factors for improving quantum efficiency.
実験 / Experimental
Using the ARIM platform instruments to fabricate Au-NDTms structures while manipulating the ratio of triangles to disks. In this process, helicon sputtering was used to deposit the bottom Au film, followed by atomic layer deposition to coat a TiO2 layer. Electron beam lithography- 130 kV was employed to pattern the nanodisk and nanotriangle structures. Subsequently, a Ti adhesion layer and Au structures were deposited using helicon sputtering, followed by a lift-off process. After measuring their optical spectra, transient absorption spectroscopy was employed to determine the quantum efficiency of hot-electron transfer. Additionally, photoemission electron microscopy (PEEM) was used to characterize the near-field properties and dephasing time.
結果と考察 / Results and Discussion
According to previous studies, quantum coherence in modal strong coupling structures can effectively enhance the quantum efficiency of hot-electron transfer. In this study, we found that under upper branch excitation, the apparent quantum efficiency (AQE) decreases as the number of triangles (with detuning) increases. Under lower branch excitation, AQE increases from 0% to 11% triangles but slightly decreases and stabilizes beyond 11%. We believe this is because 11% triangles are distributed across all coherence areas. Additionally, PEEM experiments show that under upper branch excitation, photoemission is concentrated around triangular structures, whereas under lower branch excitation, the distribution is less distinct.
図・表・数式 / Figures, Tables and Equations
Relationship between the apparent quantum efficiency (AQE) normalized by coverage ratio (CR) and the percentage of triangles (PoT)
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件