Эллипсометрия металлических пленок в условиях аномального скин-эффекта

Inhomogeneous Fredholm’s integral equations of the second kind are formulated, which describe the fields of TE and TM polarized waves in metallic films with allowance for the anomalous skin effect. The equations are solved numerically by the quadrature method. The electric fields in gold and aluminum films located on a silicon substrate and the angular dependences of the polarization angles of light reflected from the films are investigated. It is found that the solution of the inverse problem of multi-angle ellipsometry for metallic films using the standard model of the normal skin effect is characterized by instability of the reconstructed complex refractive index of the metal with a change in the thickness of the metallic film.

First applications of the ballistic model in femtosecond laser–matter interaction: Preliminary evidence of ac-run-away and new features about normal skin effect

The role of collisional absorption is supposed to be important in the beginning of the interaction between a laser pulse and matter. Later on, collective absorption phenomenons take place. The scope of this paper is to present first results about the so-called AC-run-away effect, defined as a “sudden transition from collisional absorption regime to a collective one.” For this purpose, we use a simple model based on ballistic theory. The delicate point concerning the Coulomb logarithm is also studied: we propose for it a convenient cutoff and an ensemble averaged Coulomb logarithm fit formula. Another application of the model presented here is the normal skin effect. We show some sensible differences between the present approach and those based on more common and rough collision frequency formulas.

Fokker–Planck simulations of interactions of femtosecond laser pulses with dense plasmas

The interaction of femtosecond laser pulses with solid-state density plasmas in regime of normal skin effect is investigated by means of numerical simulation. For short-wavelength lasers and laser pulses with length ≲ 120 fs full width at half maximum, the regime of normal skin effect is shown to hold for peak intensities up to 1017 W/cm2. The basic characteristics of the interaction are revealed and certain departures from simplistic models in electron distribution function, in plasma dielectric constant, and in laser absorption are pointed out. Comparison with the published experimental results is made.

Zum Skin-Effekt zeitlich periodischer elektromagnetischer Felder unter Berücksichtigung der magnetischen Widerstandsänderung

Magnetoresistance leads to a change of the normal skin-effect. The electromagnetic field, periodic in time, is calculated by a successive approximation method for a half-space, the electric conductivity of which is dependent quadratically on the magnetic field. As expected results show the existence of uneven harmonics. Compared with the case without magnetoresistance, the a-c-resist-ance of some part of the half-space is altered by additional terms, which are dependent on the intensity of the current. Analogous results are given for a planar conducting layer of constant thickness.

Zum normalen Skin-Effekt unter Berücksichtigung der magnetischen Widerstandsänderung

The penetration of a magnetic field into an infinite metallic half-space is altered due to the presence of the magnetoresistance of the medium. MAXWELL’S equations modified by the magnetic field dependence of the conductivity are solved for the case where the field at the surface is switched on immediately and is constant afterwards. It is shown that due to magnetoresistance the field runs into the medium quicker compared to the case of the pure normal skin effect. The induced eddy current has its maximum value no longer at the surface of the specimen. The results are discussed in connection with pulse methods for the measurement of magnetoresistance in high fields.