Calculations of the Absorption Coefficient of a Weak Electromagnetic Wave by Free Carriers in Quantum Wells by the Kubo-Mori Method

The Nonlinear Absorption of a Strong Electromagnetic Waves Caused by Confined Electrons in a Cylindrical Quantum Wire

“…The nonlinear absorption coefficient is considered as a function of the intensity E 0 and the energy of the strong EMW, the temperature T of the system, and the parameters of the CQW. The parameters used in the numerical calculations [6,13] are ξ = 13. Figure 1 shows the dependence of the nonlinear absorption coefficient of a strong EMW on the wire's radius at different values of temperature T of the system.…”

“…c Ω E 0 cos(Ωt) is the vector potential; E 0 and Ω are the intensity and the frequency of the EMW; a + n, , p (a n, , p ) is the creation (annihilation) operator of an electron; b + q (b q ) is the creation (annihilation) operator of a optical phonon for a state having wave vector q; ω is the frequency of a optical phonon; and C q is the electron-optical phonon interaction constant, which can be taken as [1,5,6]…”

“…In recent years, the optical properties in bulk semiconductors, as well as low-dimensional systems, have been investigated [1][2][3][4][5][6][7][8][9][10][11]. The linear absorption has been studied in normal bulk semiconductors 1, 2], in two dimensional systems [3][4][5][6] and in quantum wires [7,8].…”

“…The linear absorption has been studied in normal bulk semiconductors 1, 2], in two dimensional systems [3][4][5][6] and in quantum wires [7,8]. The nonlinear absorption of a strong electromagnetic wave (EMW) was considered in normal bulk semiconductors [9], quantum wells [10,16], doping superlattices [17,18].…”

Negative Absorption Coefficient of a Weak Electromagnetic Wave Caused by Electrons Confined in Rectangular Quantum Wires in the Presence of Laser Radiation Modulated by Amplitude

“…In quantum wires, many the physical properties of the material changes significantly from the properties of normal bulk semiconductors, including optical properties [1,2]. The linear absorption of a weak EMW and the nonlinear absorption of a strong EMW in low-dimensional systems have been studied [3][4][5][6]. The influence of laser radiation on the absorption of a weak EMW in normal bulk semiconductors, quantum wells and cylindrical quantum wires have been investigated using the quantum kinetic equation method [7][8][9][10].…”