Based On The Double Negative Material Of Reverse Cerenkov Radiation

Double negative materials (DNMs), a kind of artificially structured metamaterials,exhibit some exotic electromagnetic properties, which are not found in naturallyoccurring materials. DNMs posse negative permeability and negative permittivitysimultaneously, have some fascinating electromagnetic properties, such as the reversalof Snell’s law, Cherenkov radiation, and Doppler effect.Cherenkov radiation (CR) is extensively employed in particle physics, microwaveelectronics, cosmic-ray physics, and so on. Due to the reversed behavior of thereversed Cherenkov radiation (RCR), the physical interference of the particle detectoris minimized, and the detection sensitivity can be improved. By tailoring the materialparameters of DNMs, we can obtain a slower phase velocity. According to themechanism of CR, the device can operate at a low-voltage. Compact devices can beeasily realized by adopting DNMs. Meanwhile, it is easier to synchronize the amplifiedelectromagnetic waves with an intense electron beam bunch, and the output power canbe enhanced. Since then, we propose a novel radiation sources in microwave,millimeter wave, even in terahertz regime.This paper firstly investigated the mechanism of the radiation generated by acharged particle beam bunch moving through the channel in a circular waveguidepartially loaded with DNMs, found an effective way to enhance the RCR, and offered atheoretical basis for the direct detecting of RCR and developing high power radiationsource. Secondly, this paper studied the electromagnetic radiation excited by a chargedparticle moving along a semi-infinite apace filled with DNM. We found that theamplitude of the surface wave can be greatly enhanced by using DNMs. The enhancedsurface wave may be useful for novel terahertz sources. This article was organized asfollows:The first chapter introduced the concept, progress, and application of DNMs andRCR.The second chapter illustrated the properties of RCR for a charged particlemoving along the axis of a circular waveguide fully or partially filled with DNMs. The third chapter studied the RCR generated by a charged particle beam bunchmoving through the channel in a circular waveguide partially loaded with DNMs.Numerical results shows that the radiated energy can be greatly enhanced by increasingthe charged particle number and the particle velocity.The fourth chapter investigated the case of a charged particle moving along asemi-infinite space filled with DNMs. CR in the double-negative region exhibitsreversed radiation property. The amplitude of the surface wave is greatly enhancedover some normal dielectiric material cases.The fifth chapter, on the full-text’s summary of the completion of the work andproposed the future work plans.