coreless silica fiber based on a self-assembled polymer lens. A nearly diffraction-free Bessel
beam pattern was observed with its focused beam diameter of 20 μm maintained over a
propagation distance of 550 μm. The generated Bessel beams were experimentally tested
under various structural parameters such as the diameters of the HOF and operating
wavelengths. A beam propagation method was applied to simulate the proposed device …