Bessel beams are of great potential applications in many fields due to their non-diffraction and self-reconstruction. Here we firstly present a type of nonlinear meta-axicon to generate second harmonic Bessel beams. The nonlinear meta-axicons are based on Au/WS2 hybrid nanostructures. Zero-order and first-order Bessel beams of second harmonic are generated under exciting of 810 nm femtosecond laser. In addition, the performances of the nonlinear meta-axicons, such as the second harmonic generation (SHG) efficiency, non-diffracting distance and full width at half maximum (FWHM) are analyzed theoretically and experimentally. The experimental results are consistent with the predicted, which can enable miniaturized nonlinear optical devices related to generate nonlinear Bessel beams, having potential application in nonlinear optical manipulation, imaging and tractor beams.

中文翻译：

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通过混合元轴生成二次谐波贝塞尔光束。

贝塞尔光束因其无衍射和自重构而在许多领域具有巨大的潜在应用。在这里，我们首先提出一种非线性的元轴锥，以产生二次谐波贝塞尔光束。非线性元轴基基于Au / WS2杂化纳米结构。在810 nm飞秒激光的激发下产生二次谐波的零阶和一阶贝塞尔光束。此外，从理论上和实验上分析了非线性元轴的性能，例如二次谐波生成（SHG）的效率，非衍射距离和半峰全宽（FWHM）。实验结果与预期相符，可以使小型化的非线性光学器件产生非线性贝塞尔光束，在非线性光学操纵中具有潜在的应用前景，