Cherenkov radiation in anisotropic double-negative metamaterials

Abstract

We theoretically study reversed Cherenkov radiation (CR) in anisotropic double-negative metamaterials (DNMs) in general, and particularly in detail for one of the most practical cases, i.e., CR in a waveguide partially filled with anisotropic DNMs. The theory presented here provides a theoretical basis for possible experiments and potential applications. As an example, we discuss the physical properties of CR and the potential applications such as particle detectors and high-power sources.

Novel electromagnetic radiation in a semi-infinite space filled with a double-negative metamaterial

“…[8][9][10][11] In addition, RCR in the waveguide partially or fully loaded a DNM was studied in details. [12][13][14][15] The above results offer the basis for the experimental verification and potential applications of the RCR [16][17][18][19] due to the reversed behavior and easy control of effective electromagnetic parameters. However, the surface wave excited by the charged particle in the vacuum region has been given few attentions.…”

Research Progress in Reversed Cherenkov Radiation in Double-Negative Metamaterials

“…As stated before, at this moment, a single electron produces very small energy in the GHz region when it moves through the DNMs [27]. An intense electron beam need to be used to detect its reverse CR.…”

“…A numerical example illustrates that the total radiated energy increases with increasing particle velocity, the radiated energy spectral density has different poles at the different frequencies for different anisotropic DNMs when the loss of the anisotropic DNM is smaller, and when the radius has the same order as the operating wavelength, the influence of the waveguide radius on the total radiated energy is smaller on the whole. Third, they further generalized reversed CR in anisotropic DNMs, and particularly discussed one of the most practical cases, i.e., CR in a waveguide partially filled with anisotropic DNMs in great detail [27]. Then they explored the effective ways of improving the total radiated energy: one is that the DNMs need scale to higher frequencies such as terahertz range, the other is that the intense electron beam should be adopted, addressed the issues of potential applications such as particle detectors and high-power sources, and at last, pointed out the serious challenges.…”

Experimental Demonstration of Double-Negative Metamaterials Partially Filled in a Circular Waveguide

“…For a dominant mode TM or quasi-TM in the circular waveguide partially loaded by the DNMs, the DNMs must exhibit negative real permittivities in the radial and the axial directions and negative real permeability in the azimuthal direction [30][31][32][33]. Therefore, the DNM-loaded waveguide like a slow-wave structure can propagate the slow-wave.…”