Ultracompact and unidirectional metallic antennas
Ultracompact and unidirectional metallic antennas
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DOI：
10.1103/physrevb.82.115429
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发表时间：
2010-09-16
影响因子：
3.7
通讯作者：
Stout, Brian
中科院分区：
文献类型：
--
作者：
Bonod, Nicolas;Devilez, Alexis;Stout, Brian
我们研究了位于偶极银纳米粒子附近的单个发射体辐射的光的角度重新分布。我们指出了由发射体和粒子之间的光程差引入的相位差的基本作用，并证明了仅凭金属纳米粒子的极化率不能预测发射的方向性。特别是，我们证明了单个纳米粒子的集体或反射性质可以通过调节单个发射体的距离在lambda/30尺度上进行控制。这些结果使我们能够设计出单向和超致密的纳米天线，这些天线只由两个耦合的纳米颗粒组成，相隔一段生物连接物可以达到的距离。
We investigate the angular redistribution of light radiated by a single emitter located in the vicinity of dipolar silver nanoparticles. We point out the fundamental role of the phase differences introduced by the optical path difference between the emitter and the particle and demonstrate that the polarizability of the metallic nanoparticle alone cannot predict the emission directionality. In particular, we show that collective or reflective properties of single nanoparticles can be controlled by tuning the distance of a single emitter at a lambda/30 scale. These results enable us to design unidirectional and ultracompact nanoantennas composed of just two coupled nanoparticles separated by a distance achievable with biological linkers.