3D-steering and superfocusing of second-harmonic radiation through plasmonic nano antenna arrays
3D-steering and superfocusing of second-harmonic radiation through plasmonic nano antenna arrays
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DOI：
10.2351/1.4712171
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发表时间：
2012-07
影响因子：
2.1
通讯作者：
P. Reichenbach;L. Eng;U. Georgi;B. Voit
中科院分区：
文献类型：
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作者：
P. Reichenbach;L. Eng;U. Georgi;B. Voit
纳米粒子的二次谐波光产生(SHG)提供了原位产生光(所需频率)的可能性，而不是通过聚焦外部光束来引入光。我们的理论研究提供了通过多个排列成圆圈的纳米粒子的辐射的叠加来引导倍频光。作者假设纳米粒子为锥形或棒状。它们的辐射可以用辐射偶极子来模拟。它们的场的叠加产生了一个“热点”，其半高宽约为100 nm。更重要的是，只需改变激发光束的入射角度，就可以在XY平面上调整纳米天线圆形排列内热点的位置。
Second-harmonic generation (SHG) of light at nanoparticles provides the possibility to generate light (of a desired frequency) in-situ instead of introducing it by focusing an external light beam. Our theoretical study provides steering SHG light through the superposition of the radiation from a number of nanoparticles which are arranged in a circle. The authors assume cone-shaped or rod-shaped nanoparticles. Their radiation can be modeled as radiating dipoles. The superposition of their fields yields a “hot spot” with a full width at half-maximum of around 100 nm. Even more important, the position of the hot spot within the circular arrangement of nanoantennas can be adjusted in the xy plane simply by changing the incident angle of the exciting beam.