Fundamentals and Applications of Plasmon-Induced Hole Ejection

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H00325
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Tatsuma Tetsu 東京大学, 生産技術研究所, 教授 (90242247)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: プラズモン共鳴 / 電荷分離 / ナノ粒子 / 光ナノ加工

Outline of Final Research Achievements

It was shown that simple “photonic nanofabrication” beyond the diffraction limit of light could be a new application for plasmon resonance. One of the important factors for the nanofabrication is “high efficiency,” and it was found that efficiency can be improved by combining particles that easily collect light as “antennae”. Another important factor is the abundance of materials that can be used, and it was found that the variety of materials can be increased by a relatively simple method, “galvanic replacement”. Furthermore, while plasmon resonance can only occur with highly conductive materials such as metals, it was found that “photonic nanofabrication” using a similar resonance phenomenon is possible with semiconductors, which are not very conductive.

Free Research Field

ナノ科学

Academic Significance and Societal Importance of the Research Achievements

従来のナノ加工は主に、電子線リソグラフィーなどの手法が用いられ、コストや時間がかかるという問題があった。本研究の成果により、そうしたナノ加工の一部を、可視光による加工に置き換えられる可能性が高くなった。とくに、使用できる材料の種類を増やすための指針が複数できたため、応用の幅も広がった。この手法は、光を自在に制御する「メタマテリアル」と呼ばれる材料を、比較的簡便に作製するための技術になり得るものと期待される。