Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, Jena 07745, Germany.
Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, Potsdam 14476, Germany.
J Am Chem Soc. 2023 Dec 6;145(48):25928-25932. doi: 10.1021/jacs.3c07647. Epub 2023 Nov 27.
We report the observation of hotspot-induced emitters and photoluminescence enhancement of up to 42-fold from DNA origami-assisted plasmonic dimer nanoantennas upon excess polarized laser illumination. The presence of DNA and laser polarization alignment along the dimer axis are critical for the generation of bright emitters responsible for the observed PL increase. The emission spectrum reveals characteristic Raman peaks of amorphous carbon, suggesting the formation of carbon-based emitters in the nanoantenna due to the plasmonic hotspots at the longitudinal antenna resonance.
我们观察到，在过量偏振激光照射下，DNA 折纸辅助的等离子体二聚体纳米天线中热点诱导发射体和光致发光增强高达 42 倍。DNA 的存在和激光偏振沿着二聚体轴的对齐对于产生负责观察到 PL 增加的明亮发射体是至关重要的。发射光谱显示无定形碳的特征拉曼峰，表明由于纵向天线共振处的等离子体热点，纳米天线中形成了基于碳的发射体。
