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Electrically Driven Unidirectional Optical Nanoantennas
Nano Letters ( IF 10.8 ) Pub Date : 2017-11-02 00:00:00 , DOI: 10.1021/acs.nanolett.7b03312
Surya Prakash Gurunarayanan 1, 2 , Niels Verellen 2, 3 , Vyacheslav S. Zharinov 3 , Finub James Shirley 2, 3 , Victor V. Moshchalkov 3 , Marc Heyns 1, 2 , Joris Van de Vondel 3 , Iuliana P. Radu 2 , Pol Van Dorpe 2, 3
Affiliation  

Directional antennas revolutionized modern day telecommunication by enabling precise beaming of radio and microwave signals with minimal loss of energy. Similarly, directional optical nanoantennas are expected to pave the way toward on-chip wireless communication and information processing. Currently, on-chip integration of such antennas is hampered by their multielement design or the requirement of complicated excitation schemes. Here, we experimentally demonstrate electrical driving of in-plane tunneling nanoantennas to achieve broadband unidirectional emission of light. Far-field interference, as a result of the spectral overlap between the dipolar emission of the tunnel junction and the fundamental quadrupole-like resonance of the nanoantenna, gives rise to a directional radiation pattern. By tuning this overlap using the applied voltage, we record directivities as high as 5 dB. In addition to electrical tunability, we also demonstrate passive tunability of the directivity using the antenna geometry. These fully configurable electrically driven nanoantennas provide a simple way to direct optical energy on-chip using an extremely small device footprint.

中文翻译:

电驱动单向光学纳米天线

定向天线通过以最小的能量损耗实现无线电和微波信号的精确波束控制,彻底改变了现代电信。同样,定向光学纳米天线有望为片上无线通信和信息处理铺平道路。当前,这种天线的片上集成受到其多元件设计或复杂激励方案的要求的阻碍。在这里,我们通过实验演示了平面隧穿纳米天线的电驱动,以实现宽带光的单向发射。由于隧道结的偶极发射与纳米天线的基本四极子形谐振之间的光谱重叠而导致的远场干扰产生了定向辐射图。通过使用施加的电压来调整这种重叠,我们记录的指向性高达5 dB。除了电气可调性,我们还演示了使用天线几何形状的方向性的被动可调性。这些完全可配置的电驱动纳米天线提供了一种非常简单的方法,可以使用极小的设备占地面积来在芯片上定向光能。
更新日期:2017-11-02
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