journal article·2023-05-09Open access

Quantum-Coherence-Enhanced Hot-Electron Injection under Modal Strong Coupling

Yen-En Liu, Xu Shi, Tomohiro Yokoyama, Soshun Inoue, Yuji Sunaba, Tomoya Oshikiri, Quan Sun, Mamoru Tamura, Hajime Ishihara, Keiji Sasaki, Hiroaki Misawa

ACS Nano· Volume 17· Issue 9

Abstract

Modal strong coupling between localized surface plasmon resonance and a Fabry-Pérot nanocavity has been studied to improve the quantum efficiency of artificial photosynthesis. In this research, we employed Au nanodisk/titanium dioxide/Au film modal strong coupling structures to investigate the mechanism of quantum efficiency enhancement. We found that the quantum coherence within the structures enhances the apparent quantum efficiency of the hot-electron injection from the Au nanodisks to the titanium dioxide layer. Under near-field mapping using photoemission electron microscopy, the existence of quantum coherence was directly observed. Furthermore, the coherence area was quantitatively evaluated by analyzing the relationship between the splitting energy and the particle number density of the Au nanodisks. This quantum-coherence-enhanced hot-electron injection is supported by our theoretical model. Based on these results, applying quantum coherence to photochemical reaction systems is expected to effectively enhance reaction efficiencies.
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Research context

OpenAlex topics: Plasmonic and Surface Plasmon Research · Gold and Silver Nanoparticles Synthesis and Applications · Spectroscopy and Quantum Chemical Studies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan

Creative Research Institution, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan

Department of Materials Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

Research Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577, Japan

Research Institute for Light-Induced Acceleration System, Osaka Metropolitan University, Sakai, Osaka 599-8570, Japan

Center for Quantum Information and Quantum Biology, Osaka University, Toyonaka, Osaka 560-8531, Japan

Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan

Funding

Japan Society for the Promotion of Science · Japan Science and Technology Agency · Honjo International Scholarship Foundation

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