Editorial

Tamm, Christoph; Kisakürek, M. Volkan

doi:10.1002/hlca.19950780102

Cited by 3 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect was discovered in 1934 by Pavel Cherenkov 2 and its theoretical interpretation dates back to 1937. 3 The theory was later generalized to account for dispersive media 4 and more sophisticated descriptions have been produced since then. 5,6 The Cherenkov effect is extensively used to detect charged-particle byproducts resulting from energetic subatomic collisions in particle detectors.…”

Section: Introductionmentioning

confidence: 99%

Boundary effects in Cherenkov radiation

et al. 2004

View full text Add to dashboard Cite

The effect of dielectric boundaries on the Cherenkov radiation ͑CR͒ produced when a fast point charge moves inside or near a material is analyzed for different shapes of the sample. Calculations are offered for a charge moving near both planar and nonplanar surfaces. CR is found to be produced even when the external charge moves outside a semi-infinite medium. For charges moving near planar boundaries, the reflected radiation interferes with the direct CR, leading to oscillations in the emission probability as a function of the impact parameter relative to the interfaces. Thin-film guided modes are excited by penetrating electrons and our calculations agree reasonably well with available experiments. The bulk limit in the emission probability is recovered for charges passing by the center of cylinders or spheres of increasingly large radius. Recent experiments of energy loss of electrons passing near dielectric spheres are explained thanks to the inclusion of retardation effects in the sphere response. These effects lead to an efficient channel of radiative energy losses. Finally, the diffraction of CR in void inclusions is proposed as a tool for providing information on otherwise inaccessible buried structures.

show abstract

Section: Introductionmentioning

confidence: 99%

Boundary effects in Cherenkov radiation

et al. 2004

View full text Add to dashboard Cite

show abstract

“…The theory of CR was largely worked out more than 60 years ago by Tamm and Frank. 21,22 For an infinite medium and pulses propagating along the z axis, the fields are a function of zϪv g t and the cylindrical coordinates and . This approximation, valid for a thick sample, greatly simplifies the theory.…”

Section: A Point Sourcementioning

confidence: 99%

“…23 In the experiments discussed here, the induced dipole is oriented perpendicular to the z axis. For this orientation, the fields are proportional to cos, where is measured from the direction of the dipole; dropping for simplicity the dependence, we have [21][22][23] …”

Section: A Point Sourcementioning

confidence: 99%

“…Note that CR in a finite crystal is similar to the so-called ''Tamm problem'' of CR for a particle traveling along a finite path. 22,46 The finiteness of the crystal is expected to play an even more important role in the planar geometry, in which Cherenkov components are emitted exclusively in the forward direction. The CR pattern is the result of interference among these components, so that this pattern should change dramatically with crystal thickness.…”

Section: Finite-crystal Effectsmentioning

confidence: 99%

See 1 more Smart Citation

Cherenkov radiation emitted by ultrafast laser pulses and the generation of coherent polaritons

Wahlstrand

Merlín

2003

Phys. Rev. B

View full text Add to dashboard Cite

We report on the generation of coherent phonon polaritons in ZnTe, GaP, and LiTaO 3 using ultrafast optical pulses. These polaritons are coupled modes consisting of mostly far-infrared radiation and a small phonon component, which are excited through nonlinear optical processes involving the Raman and the second-order susceptibilities ͑respectively, impulsive stimulated Raman scattering and difference frequency generation͒. We probe their associated hybrid vibrational-electric field, in the THz range, by electro-optic sampling methods. The measured field patterns agree very well with calculations for the field due to a distribution of dipoles that follows the shape and moves with the group velocity of the optical pulses. For a tightly focused pulse, the pattern is identical to that of classical Cherenkov radiation by a moving dipole. Results for other shapes and, in particular, for the planar and transient-grating geometries are accounted for by a convolution of the Cherenkov field due to a point dipole with the function describing the slowly varying intensity of the pulse. Hence, polariton fields resulting from pulses of arbitrary shape can be described quantitatively in terms of expressions for the Cherenkov radiation emitted by an extended source. Using the Cherenkov approach, we recover the phase-matching conditions that lead to the selection of specific polariton wave vectors in the planar and transient grating geometry as well as the Cherenkov angle itself. The formalism can be easily extended to media exhibiting dispersion in the THz range. Calculations and experimental data for pointlike and planar sources reveal significant differences between the so-called superluminal and subluminal cases where the group velocity of the optical pulses is, respectively, above and below the highest phase velocity in the infrared. Using the Cherenkov radiation formalism, the fields generated by a spatiotemporally shaped pulse in a thick dispersive medium can be calculated analytically.

show abstract

“…12 is finally ascribed to transition radiation but not Cherenkov radiation because the path length of the high-energy electrons in the medium is smaller than the formation zone. 14 The effect of finite path length on Cherenkov radiation was first investigated by Tamm, 15 and later by several other authors. [16][17][18] In this article, we revisit Cherenkov radiation generated by a beam of electrons, with the inclusion of finite path length and coherent effects.…”

Section: Introductionmentioning

confidence: 99%

Cherenkov radiation generated by a beam of electrons revisited

Zheng

Zhi-Jian

et al. 2005

Physics of Plasmas

View full text Add to dashboard Cite

Cherenkov radiation generated by a beam of electrons is theoretically investigated. In the case that the boundary effect is negligible, coherent Cherenkov radiation does not depend on the longitudinal bunch form of the electron beam, which is remarkably different from other kinds of coherent radiation like coherent transition radiation and coherent synchrotron radiation. The reason for this result is ascribed to the criterion of the emission of Cherenkov radiation. The angular distribution of coherent Cherenkov radiation is mainly determined by the transverse bunch form of the beam. The spectral intensity of incoherent Cherenkov radiation is proportional to the velocity distribution function of the electrons in the beams. Based on these results, some methods are suggested to study hot electrons with the measurement of Cherenkov radiation.

show abstract

Editorial

Cited by 3 publications

References 0 publications

Boundary effects in Cherenkov radiation

Boundary effects in Cherenkov radiation

Cherenkov radiation emitted by ultrafast laser pulses and the generation of coherent polaritons

Cherenkov radiation generated by a beam of electrons revisited

Contact Info

Product

Resources

About