Spectral shifts of evanescent waves generated by the scattering of polychromatic light in the near field

Abstract

Evanescent waves generated by the scattering of polychromatic light using a spatially deterministic medium and their near-zone spectral properties, to the best of our knowledge, have not been addressed in the literature. On the basis of the first-order Born approximation, we formulate expressions for the near-zone scattered wave by assuming that the scattering potential of the medium is of the Gaussian profile. The dependence of the spectral shift on effective sizes of the scattering potential (ESSP) is shown using numerical simulations. It is indicated that the increase of either ESSP or near-field diffraction length can induce spectral shifts in scattered evanescent waves.

Electromagnetic scattering of a polarized plane wave from an ellipsoidal particle in the near field

“…Upon substituting from equations ( 4) and (5) into equation (12), we can readily obtain the Fourier transform of the scattering potential of the ellipsoidal particle ( )…”

“…Notably, the properties of evanescent fields scattered from a particulate medium have become very promising research targets, and they have attracted substantial interest in the last two decades. Typical studies on this topic included the development of novel theoretical models to analyze the scattering properties from a variety of particles and reveal the relations between the scattering properties and the scattering potential of these particles [10][11][12][13][14][15][16].…”

“…However, to the best of our knowledge, no one has formally studied the electro magnetic scattering of a polarized wave from a particulate medium in the near field. To address this problem, we extend our previous studies on the scalar scattering case in the near field [10][11][12][13] to the electromagnetic scattering situation, where we still assume that the interaction between the incident wave and the medium is extremely weak, but the incident field here is a polarized plane wave with a tuned DOP. Within the validity of the first-order Born approximation, integral expressions are derived for the three-dimensional (3D) evanescent field components in the near-zone scattered field.…”

Near-field spectral shift of a zero-order Bessel beam scattered from a spherical particle

“…In addition to the media's correlations that were capable of inducing changes in properties of the scattered field, beams of certain types also influenced the scattered field properties [10][11][12][13][14][15][16][17]. In recent years, there has been an increasing interest in non-diffracting beams after the introduction of Bessel Beams by Durnin et al [18,19].…”

Spectral shifts and spectral switches produced by scattering from a random hollow scatterer with adjustable shell thickness

“…It is worth noting that the spectral switch, which defines the phenomenon whereby the spectral lines of the scattered field make a rapid transition from a red shift to a blue shift (or vice versa), can be realized in some special cases [15,16]. In addition to the far-zone scattered spectrum, the near-zone scattered spectrum has also been addressed and the spectral changes of evanescent waves have been analyzed [17]. Recently, the incident plane waves in the subject of spectral changes were generalized to various laser beams such as rectangular Gaussian Schell-model beams [18].…”