Wang P F, Luo G Z, Yu H Y, Li Y J, Wang M Q, Zhou X L, Chen W X, Zhang Y J, Pan J Q
Opt Express. 2019 Feb 4;27(3):2703-2712. doi: 10.1364/OE.27.002703.
A novel optical antenna for optical phased arrays is proposed and simulated. A high-contrast grating structure is used to achieve extremely efficient emission. The emission efficiency is as high as 93.94% at 1.55 μm, which exceeds 50% in a range of wavelength from 1.48 μm to 1.62 μm. The antenna can achieve a perfect grating lobe suppression with background suppression of 28.4 dB when the phase difference between adjacent waveguides is 0. A 16-wire optical phased array can easily achieve a scan range of ± 22.8° × 20.2° with a beam width of 2.4° × 2.5°, by employing the optical antenna proposed.
提出并模拟了一种用于光学相控阵的新型光学天线。采用高对比度光栅结构实现了极高的发射效率。在1.55μm波长处发射效率高达93.94%，在1.48μm至1.62μm的波长范围内超过50%。当相邻波导之间的相位差为0时，该天线可实现完美的光栅旁瓣抑制，背景抑制为28.4dB。通过采用所提出的光学天线，一个16线光学相控阵能够轻松实现±22.8°×20.2°的扫描范围，波束宽度为2.4°×2.5°。
