@article{oai:nifs-repository.repo.nii.ac.jp:00010550,
 author = {Goto, Yuki and TSUJIMIRA, Toru and TSUJIMURA, Toru Ii and Kubo,  Shin},
 journal = {Journal of Infrared, Millimeter, and Terahertz Waves},
 month = {Aug},
 note = {0000-0001-6636-8500, In this paper, for the first time, we developed the measurement method of the topological charge (TC) in millimeter wave with helical wavefront by a triangular aperture. The millimeter wave with helical wavefront was passively generated by conversion from a Gaussian beam using a spiral mirror, which we also developed. Each diffraction pattern depended on TC, and negative TC and positive TC were symmetric pairs under reflection. These diffraction patterns were perfectly compatible with the calculation results.},
 pages = {943--951},
 title = {Diffraction Patterns of the Millimeter Wave with a Helical Wavefront by a Triangular Aperture},
 volume = {40},
 year = {2019}
}