title: Microaxicave: inverted microaxicon to generate a hollow beam.
abstract: We present an inverted structure of microaxicon, called a microaxicave, with periodic micro-conic-cave shapes, to generate circular hollow beams. A microaxicave is fabricated in a quartz substrate with the combination of direct laser writing and inductively coupled plasma etching. The hollow beam generated by the quartz microaxicave is directly recorded with a CCD camera, and the hollow beam is consistent with analysis by the diffraction theory.
authors.affiliation: Institute of Modern Optics, The Key Laboratory of Opto-Electronic Information Science and Technology of the Education Ministry of China, Nankai University, Tianjin, 300071, China. dfkuang@nankai.edu.cn
authors.forename: Dengfeng
authors.initials: D
authors.lastname: Kuang
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Fang