Bessel-like Beam Array Generation Using Round-tip Micro- structures and Their Use in the Material Treatment

Generation of Bessel-like beam array from polymeric microstructures, which were created using four-beam interference lithography is demonstrated. Quality of the produced Bessel-like beams depends on the geometrical parameters of the manufactured axicon-like structures, and their shape can be efficiently controlled through the laser treatment parameters. The output beam characteristics indicate the characteristic features of Bessel beams. The created Bessel-like beams were used for photopolymerisation, ablation and thin-film ink coated glass modification in order to show the material treatment abilities by the generated Bessel-like beams. The presented strategy of micro-optics formation could be employed not only for the material treatment but also for a simple creation of angular-tolerant wavefront detectors, optical imaging systems, optical tweezers, etc.