纳米天线侧向散射的方向性在生物感测以及表面增强光谱学等领域都有重要研究价值。侧向散射方向性的产生需要破坏纳米天线相对于平面波极化方向的镜像对称,由纳米粒子阵列构成的纳米天线排列灵活,易于实现非镜像对称结构。采用T-matrix方法对V型纳米金球阵列天线进行数值模拟,研究了其侧向散射的方向性,分别讨论了不同阵元数目构成的不同臂长、不同臂间开角、不同球形阵元半径、不同阵元球心间距对V型天线侧向散射方向性的影响。研究表明V型纳米阵列天线具有侧向散射方向性的可调性。

The directional side scattering of nanoantennas is significant to many research fields, such as biological sensing, and surface enhanced spectroscopy. The antenna’s mirror symmetry has to be broken relative to the light polarization for generating directional side scattering. Since the nanoantenna composed of nanoparticle array has flexible configuration, it is easy for the antenna to break mirror symmetry. The V-shaped antenna composed of gold nanosphere array was simulated with T-matrix method and the directivity of its side scattering was considered. We discussed the effects of some parameters on the directional side scattering of V-nanoantennas, such as the arm length with different number of nanospheres, opening angle, sphere radius, and distance between adjacent sphere centers. Our discussion shows the directional side scattering of V-nanoantennas composed of nanosphere array is tunable.