Diffraction-Free Bessel Beams at mm- and Submm-Wavebands

Bessel beams are a family of diffraction-free beams. They have many unique properties and prospective applications. Much attention has been focused to this subject in optics. Recently, the studies of such beams at mmand submmwavebands have been carried out in our group. The investigation results, including their theories, generation, propagation and potential applications, are presented in this paper. key words: diffraction-free, Bessel beams, millimeterand submillimeterwavebands (mmand submm-wavebands)