Xu Weihan, Zhou Linjie, Lu Liangjun, Chen Jianping
Opt Express. 2019 Feb 4;27(3):3354-3368. doi: 10.1364/OE.27.003354.
We investigate the feasibility of generating a plateau envelope for beam-steering with optical phased arrays (OPAs). The design guidelines are summarized from numerical simulations and verified with a fabricated chip, which incorporates both a coupling-suppressed curved waveguide array with a pitch of 0.8 μm for light emission and a 1-μm-long silica cavity for envelope tailoring. This silicon-on-insulator (SOI) based device demonstrates aliasing-free beam-steering over the entire field-of-view available (-32°~32°) with a far-field addressability of 6.71°. The steered beam exhibits a plateau envelope, with a peak intensity fluctuation of less than 0.45 dB, from -30° to 30°. These results represent a significant step towards realizing integrated OPA for optical beam-forming with a large aliasing-free steering range and a uniform beam intensity.
我们研究了利用光学相控阵（OPA）产生用于光束转向的平台包络的可行性。通过数值模拟总结了设计准则，并使用一个制造的芯片进行了验证，该芯片包含一个用于发光的间距为0.8μm的耦合抑制弯曲波导阵列和一个用于包络调整的1μm长的二氧化硅腔。这种基于绝缘体上硅（SOI）的器件在整个可用视场（-32°至32°）内展示了无混叠光束转向，远场可寻址性为6.71°。在-30°至30°范围内，转向光束呈现出平台包络，峰值强度波动小于0.45dB。这些结果代表了朝着实现具有大的无混叠转向范围和均匀光束强度的用于光束形成的集成OPA迈出的重要一步。
