## What is it about?

This article describes a method to simulate the propagation of THz radiation. A well-know mathematical method is used to decompose the electromagnetic waveform into Hermitt-Gausian base modes. Optimization process is carried out in order to find the best base parameters such that most of the energy is contained in small number of modes. The beam is then propagated using the well-know ABCD matrices method. The radiation source is a free electron laser, and the energy the beam carries is about 6 MeV.

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## Why is it important?

The Terahertz spectrum lies between the optical and microwave areas. Methods intended for simulating systems in the optical or microwave fields are based on assumptions and mathematical approximations suitable for each of the fields but not necessarily suitable for the terahertz field. Therefore, a designated method for THz beam propagation is important.

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## Read the Original

This page is a summary of: Study of the transmission line for Israeli THz free-electron radiation source, Physics of Plasmas, November 2022, American Institute of Physics,

DOI: 10.1063/5.0112104.

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