Anomalous Momentum States, Non-Specular Reflections, and Negative Refraction of Phase-Locked, Second Harmonic Pulses

We simulate and discuss novel spatio-temporal propagation effects that relate specifically to pulsed, phase-mismatched second harmonic generation in a negative index material having finite length. Using a generic Drude model for the dielectric permittivity and magnetic permeability, the fundamental and second harmonic frequencies are tuned so that the respective indices of refraction are negative for the pump and positive for the second harmonic signal. A phase-locking mechanism causes part of the second harmonic signal generated at the entry surface to become trapped and dragged along by the pump and to refract negatively, even though the index of refraction at the second harmonic frequency is positive. These circumstances culminate in the creation of an anomalous state consisting of a forward-moving second harmonic wave packet that has negative wave vector and momentum density, which in turn leads to non-specular reflections at intervening material interfaces. The forward-generated second harmonic signal trapped under the pump pulse propagates forward, but has all the attributes of a reflected pulse, similar to its twin counterpart generated at the surface and freely propagating backward away from the interface. This describes a new state of negative refraction, associated with nonlinear frequency conversion and parametric processes, whereby a beam generated at the interface can refract negatively even though the index of refraction at that wavelength is positive

MECHANISMS OF CULTURAL INNOVATION ACTIVITY OF STUDENTS IN HIGHER EDUCATIONAL INSTITUTIONS

This article is a scientific study of the mechanisms of formation of a culture of innovative activity of students of technical higher education. A number of references have been analyzed in defining the directions of scientific research, and the creation of educational technologies that allow students to dramatically increase the innovative learning environment and mastery indicators that can lead to a culture of innovative thinking has been identified as the main direction and goal of our research. As a result of our research, the need to create opportunities for students to use modern literature to increase their interest in science and improve their mastery. The article provides information on how to solve this problem, as well as the creation of electronic textbooks, manuals, task sets and electronic manuals for students of technical disciplines in several branches and their capabilities. Recommendations and suggestions are also made on the mechanisms of formation and development of integration of higher education institutions and industrial enterprises, the introduction of innovative technologies in the educational process and the formation of an innovative environment.Keywords:  innovation, integration, innovative learning environment, e-literature, innovative ability, learning process, independent learning, e-learning, mastery indicators, innovative thinking culture, learning development mechanisms, innovative practice platform, student personal indicators, self-assessment system and individual control

Technology of fabrication of CDSXTe1-X solid solution on silicon substrate

Heterojunction between Si and CdSxTe1-x have been obtained by vacuum deposition of powders of cadmium sulfide and cadmium telluride on the surface of monocrystalline silicon. The optimal temperature regime for the growth of the CdSxTe1-x solid solution on the silicon surface has been determined. The values of the crystal lattice constant and the thickness of the CdSxTe1-x solid solution at the interface of the n/Si − n/ CdSxTe1-x heterostructure are calculated