A lattice-shifted photonic crystal waveguide (LSPCW) maintains slow light as a guided mode and works as an optical antenna when a kind of double periodicity is introduced. Selecting one LSPCW from its array and converting the fan beam to a spot beam using a collimator lens allows non-mechanical, two-dimensional beam steering. We employed a shallow-etched grating into the LSPCW as the double periodicity to increase the upward emission efficiency and designed a bespoke prism lens to convert the steering angle in a desired direction while maintaining the collimation condition for the steered beam. As a result, a sharp spot beam with an average beam divergence of 0.15° was steered in the range of ${40}^\circ \; \times \;{4.4}^\circ $ without precise adjustment of the lens position. The number of resolution points obtained was 4256. This method did not require complicated and power-consuming optical phase control like that in optical phased arrays, so it is expected to be applied in complete solid-state light detection and ranging.

中文翻译：

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慢光波导光栅和棱镜透镜的宽光束转向

当引入一种双重周期性时，晶格移位光子晶体波导（LSPCW）保持慢光为引导模式，并用作光天线。从其阵列中选择一个LSPCW，并使用准直透镜将扇形光束转换为点状光束，可以进行非机械的二维光束转向。我们在LSPCW中采用浅蚀刻光栅作为双重周期性，以提高向上发射效率，并设计了定制的棱镜，可在保持转向光束的准直条件的同时将转向角转换为所需方向。结果，在$ {40} ^ \ circ \范围内操纵了平均光束发散度为0.15°的尖锐点光束。\ times \; {4.4} ^ \ circ $无需精确调整镜头位置。所获得的分辨率点数为4256。该方法不需要像光学相控阵那样复杂且耗电的光学相位控制，因此有望应用于完整的固态光检测和测距。