Photodetection with Active Optical Antennas
Photodetection with Active Optical Antennas
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DOI：
10.1126/science.1203056
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发表时间：
2011-05-06
期刊：
影响因子：
56.9
通讯作者：
Halas, Naomi J.
中科院分区：
文献类型：
--
作者：
Knight, Mark W.;Sobhani, Heidar;Halas, Naomi J.
纳米天线是光收集的关键光学部件；光电二极管将光转化为电子流以进行光检测。我们证明了这两个不同的、独立的功能可以组合成相同的结构。耦合到金属纳米天线中的光子激发共振等离子体，等离子体衰变为高能的热电子，穿过纳米天线-半导体界面的势垒注入，产生光电流。这种双功能结构是一种高度紧凑、波长共振和特定于偏振的紧密探测器，其光谱响应延伸到远低于半导体带边的能量。
Nanoantennas are key optical components for light harvesting; photodiodes convert light into a current of electrons for photodetection. We show that these two distinct, independent functions can be combined into the same structure. Photons coupled into a metallic nanoantenna excite resonant plasmons, which decay into energetic, "hot" electrons injected over a potential barrier at the nanoantenna-semiconductor interface, resulting in a photocurrent. This dual-function structure is a highly compact, wavelength-resonant, and polarization-specific tight detector, with a spectral response extending to energies well below the semiconductor band edge.