A charged particle passing through or near a narrow optical fiber induces, by polarisation, coherent light guided by the fiber. In the limit of zero crossing angle, the radiation tends towards a Cherenkov radiation with a discrete spectrum, studied by different authors. If the particle crosses a bent fiber at regularly spaced points, interference gives quasi-monochromatic lines. If the particle...

We investigate further [1], [2] the possibility of phenomenologically visible effects of violation of Lorentz invariance in the framework of noncommutative electrodynamics. We show that, in this framework, Cherenkov radiation is permitted in vacuum and we explicitly compute its spectrum. We discuss the phenomenological impact of the merge of this new analysis with the old results of the substan...

The abnormally intense radiation due to the uniform rotation of electron around the equatorial plane of a dielectric sphere is obtained. It takes place when the sphere surface is at a specific distance from the electron orbit and when the Cherenkov condition for electron and the matter of the sphere is satisfied. PACS number: 41.60.Ap, 41.60.Bq

We propose an approach for an efficient generation of optical Cherenkov radiation (OCR) in the near-infrared by tailoring the waveguide dispersion for a zero group-velocity mismatching between the radiation and the pump soliton. Based on an As(2)S(3) slot waveguide with subwavelength dimensions, dispersion profiles with four zero dispersion wavelengths are found to produce a phase-matching nonl...

For waveguides with two separate regions of anomalous dispersion, it is possible to create a quasistable two-color solitary wave. In this paper, we consider how those waves interact dispersive radiation, i.e., both the generation Cherenkov radiation and scattering incident waves. We derive analytic resonance conditions verify them through numeric experiments. also report driving internal oscill...

Cherenkov Radiation (CR), this blue glow seen in nuclear reactors, is an optical light originating from energetic β-emitter radionuclides. CR emitter 90Y triggers a cascade of energy transfers in the presence of a mixed population of fluorophores (which each other match their respective absorption and emission maxima): Cherenkov Radiation Energy Transfer (CRET) first, followed by multiple Först...

We show that in the framework of noncommutative classical electrodynamics Cherenkov radiation is permitted in vacuum and we explicitly compute its spectrum at first order in the noncommutative parameter. We discuss the phenomenological impact of the merge of this new analysis with the old results of the substantial modification to the spectrum of the synchrotron radiation obtained in [1]. We pr...

The recent detection of gamma radiation from Mkn 501 at energies as high as ∼ 25 TeV suggests stringent upper bounds on the diffuse, far infrared, extragalactic radiation density. The production of electron-positron pairs through photon-photon collisions would prevent gamma photons of substantially higher energies from reaching us across distances of order 100Mpc. However, coherently arriving T...

A new terahertz (THz) source in air based on the bifilamentation of femtosecond laser pulses is reported. This THz radiation is 1 order of magnitude more intense than the transition-Cherenkov THz emission from femtosecond laser filaments reported recently and shows different angular and polarization properties. We attribute it to the emission from a bimodal transmission line created by two plas...

With the flourishing development of nanophotonics, Cherenkov radiation pattern can be designed to achieve superior performance in particle detection by fine-tuning properties metamaterials such as photonic crystals (PCs) surrounding swift particle. However, sensitive geometry and material PCs, periodicity, unit thickness, dielectric fraction, making direct analysis inverse design difficult. In ...