See Kel-Meng, Lin Fan-Cheng, Chen Tzu-Yu, Huang You-Xin, Huang Chen-Hsien, Yeşilyurt A T Mina, Huang Jer-Shing
Department of Chemistry , National Tsing Hua University , Hsinchu 30013 , Taiwan.
Leibniz Institute of Photonic Technology , Albert-Einstein Straße 9 , 07745 Jena , Germany.
Nano Lett. 2018 Sep 12;18(9):6002-6008. doi: 10.1021/acs.nanolett.8b02836. Epub 2018 Aug 31.
Optical nanoantennas mediate near and far optical fields. Operating a directional nanoantenna in transmitting mode is challenging because the antenna needs to be driven by a nanosized optical frequency generator, which must work at the antenna's resonance frequency and be precisely attached to the antenna's feed with correct polarization. Quantum emitters have been used as optical nanogenerators, but their precise positioning relative to the nanoantenna is technically challenging, setting up a barrier to the practical implementation. One unique source to drive nanoantenna is the photoluminescence from the material of the nanoantenna because the high operational frequency of the antenna reaches the regime for the electronic transitions in matter. Here, we exploit plasmon-modulated photoluminescence (PMPL) as an effective optical source to drive directional nanoantennas. We experimentally realize two technically challenging theoretical proposals, namely, an optical nanospectrometer based on Yagi-Uda nanoantennas and tunable broadband directional emission from log-periodic nanoantennas. Using photoluminescence from the nanoantenna as an optical source promotes practical implementation of transmitting optical nanoantennas.
光学纳米天线可调控近场和远场光。在发射模式下操作定向纳米天线具有挑战性，因为天线需要由纳米级光学频率发生器驱动，该发生器必须在天线的共振频率下工作，并且必须以正确的偏振精确地连接到天线的馈源。量子发射器已被用作光学纳米发生器，但其相对于纳米天线的精确定位在技术上具有挑战性，这为实际应用设置了障碍。一种驱动纳米天线的独特光源是纳米天线材料的光致发光，因为天线的高工作频率达到了物质中电子跃迁的范围。在这里，我们利用等离子体调制光致发光（PMPL）作为驱动定向纳米天线的有效光源。我们通过实验实现了两个技术上具有挑战性的理论方案，即基于八木-宇田纳米天线的光学纳米光谱仪和对数周期纳米天线的可调谐宽带定向发射。利用纳米天线的光致发光作为光源促进了发射光学纳米天线的实际应用。
