Smith–Purcell Radiation Driven by the Field of a Standing Laser Wave

Abstract

Smith-Purcell radiation (SPR) is well known as a source of quasi-monochromatic electromagnetic radiation that occurs when fast electrons move above a diffraction grating. In this paper, we calculated the Smith–Purcell radiation generation from a flat surface along which there is a field of a standing laser wave. A periodically changing laser field induces a periodic inhomogeneity in the distribution of electrons in the near-surface layer. This periodicity, being an analogue of a diffraction grating, leads to the possibility of generating Smith– Purcell radiation. It is shown that the properties of Smith–Purcell radiation from such an unusual “light” grating are also unusual: the dispersion relation, unlike the standard for Smith–Purcell radiation, does not contain diffraction orders, so that all radiation is concentrated in one peak. The calculated effect makes it possible to control the radiation frequency or angle by changing the laser frequency and may be of interest for the development of new compact radiation sources with tunable characteristics and for non-invasive diagnostics of relativistic electron beams.

Radiation processes on acoustic superlattices

“…Note that the electromagnetic properties of the interface can also be periodically controlled by external electromagnetic fields. An example of that type has been considered recently in [23], where the periodic structure is generated by a standing laser wave.…”

Cholesteric Liquid Crystals Based Micro‐Fingerprints Generator for Anti‐Counterfeiting Labels

“…[ 11–15 ] Due to their unique properties CNLCs have been used in a plethora of applications in optics, photonics, and security. [ 16–18 ] In 2012 Nakayama et al. have proposed the use of chiral LCs as materials for optical security devices, developing a way to prepare random patterns with a fingerprint‐like texture.…”

“…[11][12][13][14][15] Due to their unique properties CNLCs have been used in a plethora of applications in optics, photonics, and security. [16][17][18] In 2012 Nakayama et al have proposed the use of chiral LCs as materials for optical security devices, developing a way to prepare random patterns with a fingerprint-like texture. [19] Recently, a lot of research has been carried out on the peculiar optical properties of LCs confined inside spheres, tens of microns in size.…”