光致发光驱动的宽带发射定向光学纳米天线
Photoluminescence-driven Broadband Transmitting Directional Optical Nanoantennas
摘要：
光学纳米天线介导近和远光场。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尺寸的光频发生器驱动，在天线谐振频率下工作，并以正确的方向精确地连接到天线馈电。量子发射器已被用作光学纳米发电机。然而，它们相对于纳米天线的精确定位是实际实施的技术障碍。驱动纳米天线的一个独特来源是天线材料的光致发光，因为操作频率范围对应于物质中的电子跃迁。在这里，我们利用等离子体激元调制光致发光（PMPL）作为一种有效的光源来驱动定向纳米天线。我们实验实现了两个技术上具有挑战性的理论建议，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。使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实现。
英文摘要：
Optical nanoantennas mediate near and far optical fields. Operating a directional nanoantenna in transmitting mode is challenging as the antenna needs to be driven by a nanosized optical-frequency generator, working at the antenna resonance frequency and attached precisely to the antenna feed with a correct orientation. Quantum emitters have been used as optical nanogenerators. However, their precise positioning relative to the nanoantenna is a technical barrier to the practical implementation. One unique source to drive nanoantenna is the photoluminescence of the antenna material as the operation frequency range corresponds to 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, optical nano-spectrometer 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.
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