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Compared with traditional vortex beams, high-order Bessel beams (HoBBs) have the unique characteristics of non-diffraction and self-healing, which makes them more competitive in fields of complex-environment optical manipulation and long-distance optical communication. With the progress of machining technology, the realization of micro-nano-sized optical components becomes possible, and integrated optics becomes the trend of future development. However, up to now, the traditional devices for generating HoBBs have a large volume and high weight, which makes it difficult to achieve optical integration. Here, we have designed an ultra-compact micro-optical element to generate high-quality micro-sized HoBBs. Good morphology of the element prepared via laser direct writing (LDW), and beam characteristics of non-diffraction and self-healing were demonstrated experimentally.

Ultra-compact micro-optical elements for generating high-order Bessel beams