为了实现光相控阵的大规模扩展和无栅瓣扫描，提出了一种工作波长为1550 nm的小型化高效率的介质光纳米天线。设计的天线呈喇叭形，由硅材料构成，尺寸为亚波长量级。光通过硅波导从天线底部馈入，之后再被天线有效地辐射到自由空间中。由于硅材料对波长为1550 nm的光是透明的，因此材料吸收所造成的损耗非常小，天线具有很高的辐射效率。利用三维电磁场仿真软件对天线进行仿真、优化，最终得到在垂直于辐射方向的平面上投影尺寸为0.82 μm×0.28 μm的天线。仿真、优化的结果表明，天线在1550 nm处的增益为6.1 dB，辐射效率为82.7%，具有方向图对称性好、主瓣垂直辐射、无双向辐射等良好的辐射特性。

To realize a large scalable optical phased array and beam steering without grating lobes, we design a miniaturized dielectric optical nanoantenna operating at 1550 nm with high efficiency. The nanoantenna is trumpet-shaped with a footprint and composed of silicon in the subwavelength order. Light is fed from the bottom of the nanoantenna by a silicon waveguide and then radiated into free space efficiently. Because silicon is nearly transparent to the wavelength of 1500 nm, absorption loss caused by the material is very low and the nanoantenna has a high radiation efficiency. A three-dimensional electromagnetic simulation software is used for simulation and optimization. The final footprint of the designed nanoantenna vertical to the radiation direction is 0.82 μm×0.28 μm. The results of simulation and optimization indicate that the nanoantenna has good radiation characteristics at 1550 nm with a gain of 6.1 dB, an efficiency of 82.7%, a good symmetry of radiation pattern, emitting vertically to the nanoantenna plane and no bidirectional radiation.