Radiation induced effects in CdSSe microcrystallites embedded in glass

Fourier transient grating in semiconductors with nonlinear carrier recombination

“…Concentration gratings can be used in pulsed (transient) [8][9][10][11][12][13][14][15][16][17][18] and in steady-state applications [19][20][21]. Several different physical properties for read-out signals have been used for different semiconductors and probe wavelengths, including the refractive index (so-called holographic TG) [8][9][10][11][12][13][15][16][17][18], the absorption [14,17,22], the photoconductivity current [19][20][21]23], or the electron spins [24]. Under an additional assumption of local space charge neutrality, the sinusoidal TG erasure time has ‡ On leave from Vilnius University (e-mail: vytas@ele.kth.se and/or vytautas.grivickas@FF.vu.lt).…”

“…In the experiments discussed above, the sinusoidal profile is a reasonable approximation for the carriers generated instantaneously by short pulses, either using a light interference pattern [8][9][10][11][12][13][15][16][17][18][19][20][21][22] or a single pulse projected through a semitransparent grating [1,15,25,26]. Although nonlinear recombination could be present in these experiments, it was commonly assumed that a sinusoidal approximation may still provide an estimation which is valid at small grating periods for obtaining the transport parameters [8-12, 16, 27].…”