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Obliczanie współczynnika absorbcji supersieci InAs/GaSb

Machowska-Podsiadło E., Bugajski M.

Elektronika : konstrukcje, technologie, zastosowania

2014

Vol. 55, nr 11

60-62

W pracy przedstawiono wyniki obliczeń dla supersieci (InAs)10 ML / (GaSb)10 ML z asymetrycznymi powierzchniami międzyfazowymi. Symulacje zrealizowano z zastosowaniem zmodyfikowanej 3-pasmowej metody k•p, która uwzględnia mieszanie się stanów ciężkich oraz lekkich dziur na powierzchniach międzyfazowych w strukturze. Wyznaczono strukturę pasmową oraz współczynnik absorpcji supersieci, w temperaturze T=300K. Obliczenia wykonano dla światła padającego na strukturę prostopadle do płaszczyzny warstw supersieci (tj. w kierunku z) i spolaryzowanego w kierunku x (polaryzacja TE). Symulacje zrealizowano dla dwóch dyskretyzacji w przestrzeni wektora falowego kt=(kx, ky), tj. z krokiem Δkx=Δky=0,01π/a oraz Δkx=Δky=0,005π/a, gdzie a jest stałą sieci.

The paper presents results of calculations of band structure of (InAs)10 ML / (GaSb)10 ML superlattice with asymetric interfaces. Simulations have been performed using modified k•p method which takes into account valence band mixing at the interfaces. The absorption coefficient of the superlattice has been determined at T=300K. The calculation has been done for normal incidence and TM polarization of incoming light. Two different discredizations in the wavevector space kt=(kx, ky) have been considered; with Δkx=Δky=0,01π/a step and Δkx=Δky=0,005π/a, where a is lattice constant.

Reflection and transmission of waves from a plane interface between viscous liquid and magneto elastic solid half space with voids

Acharya D. P., Maji C.

International Journal of Applied Mechanics and Engineering

2009

Vol. 14, no 1

21-54

This paper investigates the propagation of plane waves as well as their reflection and transmission from the plane interface which separates a viscous liquid half space and a magneto elastic solid semi infinite medium containing a distribution of void pores. From the analysis of the propagation of plane waves in a magneto elastic solid medium with voids, it is found that the longitudinal wave in a void solid medium is subject to dispersion of the general wave form. In this case, short wave and long wave approximations have been made. A 'cut of frequency', which depends upon the void parameter, exists below which one of the longitudinal waves cannot propagate at all. Amplitude and energy ratios of various reflected and transmitted waves are presented in each of the four cases when (i) a set of coupled longitudinal waves (ii) a similar set of coupled waves (iii) a transverse wave, propagating through the solid half space (iv) a longitudinal wave propagating through the viscous liquid half space, are made incident at the interface. Numerical computations are made for a specific model and results are presented graphically to highlight the modulations of these ratios due to the variation of incident angle of the incident wave. It is found that the amplitude and energy ratios of various reflected and transmitted waves are functions of angle of incidence and frequency. The effects of viscosity of the liquid, magnetic field as well as void nature of the solid medium on the amplitude and energy ratios have been analyzed from the graphical representations.