Angular-modulated spatial distribution of ultrahigh-order modes assisted by random scattering
Kan Xue-Fen1, Yin Cheng1, 2, †, Xu Tian3, Chen Fan4, Li Jian1, Han Qing-Bang1, Chen Xian-Feng2
       

(color online) Schematic diagram of the hollow-core metal cladding waveguide.