Radiation of a TM mode from an open end of a three-layer dielectric capillary  

作　　者：Sergey NGalyamin Alexandr MAltmark Sergey NGalyamin;Alexandr MAltmark(St.Petersburg State University,7/9Universitetskayanab.,St.Petersburg 199034,Russia;St.Petersburg Electrotechnical University“LETI”,5ProfessoraPopova,St.Petersburg 197022,Russia)

机构地区：[1]St.Petersburg State University,7/9Universitetskayanab.,St.Petersburg 199034,Russia [2]St.Petersburg Electrotechnical University“LETI”,5ProfessoraPopova,St.Petersburg 197022,Russia

出　　处：《Chinese Physics B》2024年第7期311-318,共8页中国物理B（英文版）

基　　金：supported by the Russian Science Foundation(Grant No.18-72-10137)。

摘　　要：Modern trends in beam-driven radiation sources include the interaction of Cherenkov wakefields in open-ended circular waveguides with complicated dielectric linings, with a three-layer dielectric capillary recently proposed to reduce radiation divergence being a representative example [Opt. Lett. 45 5416(2020)]. We present a rigorous approach that allows for an analytical description of the electromagnetic processes that occur when the structure is excited by a single waveguide TM mode. In other words, the corresponding canonical waveguide diffraction problem is solved in a rigorous formulation. This is a continuation of our previous papers which considered simpler cases with a homogeneous or two-layer dielectric filling. Here we use the same analytical approach based on the Wiener–Hopf–Fock technique and deal with the more complicated case of a three-layer dielectric lining. Using the obtained rigorous solution, we discuss the possibility of manipulating the far-field radiation pattern using a third layer made of a low permittivity material.

关 键 词：diffraction radiation open-ended waveguide Wiener–Hopf technique Cherenkov radiation 

分 类 号：O441.4[理学—电磁学]