首页|Radiation of a TM mode from an open end of a three-layer dielectric capillary
Radiation of a TM mode from an open end of a three-layer dielectric capillary
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Modern trends in beam-driven radiation sources include the interaction of Cherenkov wakefields in open-ended cir-cular 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.
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