Self-assembled axicon lens in integrated optical fiber

This work reports the fabrication of an integrated axicon lens within a monolithic fiber-upon-planar format. The lens is self-assembled around a tapered optical fiber during flame hydrolysis planarization. The formed lens approximates an oblate axicon that upon launch generates a quasi-Bessel beam, guided in the planar optical layer of the substrate. Experimental observations are theoretically concurred using Fourier-based beam propagation.