Enhancing plasmonic hot-carrier generation by strong coupling of multiple resonant modes
| Autor: | Xuming Zhang, Yat Lam Wong, Abdel I. El Abed, Huaping Jia, Aoqun Jian, Dangyuan Lei |
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| Rok vydání: | 2021 |
| Předmět: |
Photocurrent
Materials science business.industry Resonance Reflector (antenna) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Surface plasmon polariton 0104 chemical sciences Mode coupling Optoelectronics General Materials Science Surface plasmon resonance 0210 nano-technology Absorption (electromagnetic radiation) business Plasmon |
| Zdroj: | Nanoscale. 13:2792-2800 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/d0nr07643k |
| Popis: | Plasmon-induced hot carriers have recently attracted considerable interest, but the energy efficiency in visible light is often low due to the short lifetime of hot carriers and the limited optical absorption of plasmonic architectures. To increase the generation of hot carriers, we propose to exert multiple plasmonic resonant modes and their strong coupling using a metal-dielectric-metal (MDM) nanocavity that comprises an Au nanohole array (AuNHA), a TiO2 thin film and an Au reflector. Unlike common MDM structures, in addition to the Fabry-Perot mode in the dielectric layer, AuNHA as the top layer is special because it excites the localized surface plasmon resonance (LSPR) mode in the Au nanoholes and launches the gap surface plasmon polariton (GSPP) mode in the Au reflector surface. The spatial field overlapping of the three resonance modes enables strong mode coupling by optimizing the TiO2 thickness, which leads to notably enhanced average IPCE (∼1.5%) and broadband photocurrent (170 μA·cm-2). This MDM structure would be useful for photochemistry and photovoltaics using sunlight. |
| Databáze: | OpenAIRE |
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