Study on a Quasi-Optical Mode Converter for Gyrotron Based on Metamaterial

Artificial metamaterials offer unique functionalities for manipulating the spectral and spatial properties of electromagnetic waves in unconventional ways. In this paper, we report a transmission-type quasi-optical mode converter for gyrotron based on metamaterial. The initial simulation results show that the designed metamaterial quasi-optical mode converter is capable to transform the cylindrical TE01 mode to Gaussian beam, and the beam on the observed plane is with more than 95% scalar Gaussian mode content.