Opt Express. 2022 Nov 21;30(24):43842-43851. doi: 10.1364/OE.472207.
This paper proposes a phase-only modulation method to improve the main lobe's efficiency of the Airy beam based on the truncated asymptotic expression of the Airy function. As the truncated asymptotic expression can greatly reduce the range of amplitude modulation, it can be applied to the equal-amplitude modulation method with less amplitude error, which simplifies the design difficulty of the device and improves the beam's efficiency. A transmissive metasurface with a relative bandwidth of 10% is further adapted to generate the Airy beam with characteristics of non-diffraction, self-bending, and high-efficiency, which benefits the practical application of the Airy beam.
本文提出了一种基于艾里函数截断渐近表达式的纯位相调制方法来提高艾里光束的主瓣效率。由于截断渐近表达式可以大大减小振幅调制的范围，因此可以应用于幅度误差较小的等幅调制方法，从而简化了器件的设计难度并提高了光束的效率。进一步采用具有 10%相对带宽的透射超表面来产生具有无衍射、自弯曲和高效率等特性的艾里光束，这有利于艾里光束的实际应用。
