期刊
NANO LETTERS
卷 20, 期 7, 页码 5243-5250出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01569
关键词
surface plasmon resonance; nanohole arrays; diarylethenes; molecular photoswitch; FDTD; plasmon-enhanced light-matter interaction
类别
资金
- Deutsche Forschungsgemeinschaft (DFG - German Research Foundation) [SCHE 505/13-1, MA 2151/3-1, HU 1682/3-1]
Diarylethene molecules are discussed as possible optical switches, which can reversibly transition between completely conjugated (closed) and nonconjugated (open) forms with different electrical conductance and optical absorbance, by exposure to UV and visible light. However, in general the opening reaction exhibits much lower quantum yield than the closing process, hindering their usage in optoelectronic devices. To enhance the opening process, which is supported by visible light, we employ the plasmonic field enhancement of gold films perforated with nanoholes. We show that gold nanohole arrays reveal strong optical transmission in the visible range (similar to 60%) and pronounced enhancement of field intensities, resulting in around 50% faster switching kinetics of the molecular species in comparison with quartz substrates. The experimental UV-vis measurements are verified with finite-difference time-domain simulation that confirm the obtained results. Thus, we propose gold nanohole arrays as transparent and conductive plasmonic material that accelerates visible-light-triggered chemical reactions including molecular switching.
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