Vladimir V. Trubaev

Surface electromagnetic waves in optics

The basic concepts of surface electromagnetic waves (SEWs) in the optical band, the unique features of their excitation by light at the boundary of condensed media, and the participation of SEWs in the formation of periodic structures and other photophysical processes that occur on surfaces due to the influence of high-intensity laser radiation are presented. The use of middle infrared SEW for measuring optical characteristics of materials is considered. A method, developed by the authors, for measuring the real part of the SEW wave vector to obtain metal plasma frequency directly, is presented.

Formation of microrelief on silicon surface under action of radiation pulses with different polarization

The regular structures formation on a silicon surface under the millisecond pulse of linear- polarized, circular-polarized and unpolarized Nd-laser light irradiation has been studied experimentally. The surface structures induced by the interference of incident wave and surface electromagnetic waves and also the double- and triple-period structures with periods d equals 2 - 3 microns were observed in the nonhomogeneous melting regime. The diffraction pattern separation at higher incident fluence and incident angles have been observed. The main peculiarities of the surface structures formation were explained by polaritonic mechanism.

Measurement of SEW phase velocity by optical heterodyning method

Heterodyning surface electromagnetic wave (SEW) interferometer for measuring SEW phase velocity and the corresponding metal plasma frequency is described. Plasma frequency measurements for gold and copper are reported.

Negative dispersion cylindrical surface plasmon-polaritons in layered media

The general theories for the behavior of the cylindrical modes as well as dispersion curves for simplest case (metal — vacuum) have been presented a long time ago [1]. Recently, experimental works verifying the existence of surface plasmon resonances in cylindrical geometry have been demonstrated. The dispersion relation for surface plasmons in single gold nanorod was obtained from experimental results [2]. Silver nanowires as surface plasmon resonators were experimentally demonstrated [3]. Experimental demonstration of negative refractive index material in optical range caused by surface plasmon resonance of pair of parallel metal nanorods was reported [4]. The surface polaritons for the left-handed material in cylindrical geometry were investigated [5] for terahertz frequency range. At the same time it is known [6] the negative reflectance index for surface plasmons of layered systems was realized with transition layers for plane boundary case. In this work surface plasmons of transition layers in cylindrical geometry were considered.

Peculiarities of the dynamics of the relief induced by two-beam laser interference on silicon surface near the melting threshold

To study the material mechanisms of laser-induced silicon microrelief formation the periodic space-modulated heating up to melting point was used. On the basis of measurements of dynamics of surface thermal radiation and of the relief height the conclusion about material mechanisms of relief formation had been made.

Relief self-organization under laser action on surface

The surface periodic structures induced by interference of surface plasmon-polaritons and waveguide modes with laser radiation are discussed.

Laser-induced semiconductor-metal phase transition and periodic structure formation on silicon surface

The regular structure formation on a silicon surface under the millisecond pulse of linear-polarized Nd-laser light irradiation has been studied experimentally. The surface structures induced by the interference of incident wave and surface electromagnetic waves and also the double-period structures with periods d — 2-3 microns were observed in the nonhomogeneous melting regime. The double-period structures formation was explained by polaritonic mechanism and was due to a nonlinear absorptance changes in semiconductor-metal phase transition.

Surface structures formation by pulse heating of metals in oxidized environment

Experimental investigation of ordered and disordered surface structure formation under the pulse laser radiation effect of titanium and zirconium metal surfaces primary in oxidizing environment are presented. A model for qualitative explanation of formed structures is proposed. The occurrence of dilate stress fluctuation will induce the vacancy concentration growth that consequently results in tensile stress growth.