title: Modal analysis and efficient coupling of TE₀₁ mode in small-core THz Bragg fibers.
abstract: We report a design of low-loss THz Bragg fibers with a core size on the order of wavelength that operates near the cutoff frequency of its TE01 mode. We also propose a broadband Y-type mode converter based on branched rectangular metallic waveguides to facilitate coupling between the TE01 mode of the Bragg fiber and the TEM mode in free space with 60% efficiency. Our fiber holds strong promise to facilitate beam-wave interaction in gyrotron for high-efficiency THz generation.
authors.forename: H Y
authors.initials: HY
authors.lastname: Yao
authors.forename: J Y
authors.initials: JY
authors.lastname: Jiang
authors.forename: Y S
authors.initials: YS
authors.lastname: Cheng
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Chen
authors.forename: T H
authors.initials: TH
authors.lastname: Her
authors.forename: T H
authors.initials: TH
authors.lastname: Chang