Microaxicave: inverted microaxicon to generate a hollow beam

摘要

We present an inverted structure of microaxicon, called a microaxicave, with periodic micro-conic-cave shapes, tongenerate circular hollow beams. A microaxicave is fabricated in a quartz substrate with the combination of directnlaser writing and inductively coupled plasma etching. The hollow beam generated by the quartz microaxicave isndirectly recorded with a CCD camera, and the hollow beam is consistent with analysis by the diffraction theory.