Room-Temperature Optical Nonlinearities in GaAs

Abstract

We report the first systematic study of the frequency dependence of optical nonlinearities of bulk GaAs at room temperature. In contrast to the previous understanding, band filling and plasma screening of Coulomb enhancement of continuum states are found to be the dominant contributions to the dispersive optical nonlinearities under quasi steady-state excitations. The partly phenomenological semiconductor plasma theory is in good agreement with the experimental data.

Light-induced transmission nonlinearities in gallium selenide

“…21,23 From the comparison of the calculated absorption coefficients at 300 K in GaAs and GaSe we can conclude that our results in GaSe are similar to those obtained for GaAs, with the exception that the absorption coefficient values in GaSe are almost one order of magnitude lower. On the other hand, a similar reduction of the exciton absorption peak is obtained at photogenerated carrier concentrations which are approximately one order of magnitude higher in GaSe than in GaAs.…”

Exciton valley relaxation in a single layer ofWS2measured by ultrafast spectroscopy

“…Monolayer materials exhibit ultra-tight quantum confinement [20,21,35]. Thus phasespace filling of carriers, which is related to Pauli-blocking, is very significant [26,34,35]. A similar blue shift has been observed in MoS 2 transient absorption studies as well [26].…”

“…We attribute this dispersive distortion to phase-space filling effects similar to those ob-served in conventional semiconductors [34,35]. Briefly the photoexcited population blueshifts the A exciton absorption, resulting in a differential line-shape in the transient spectrum.…”

The Research Laboratory of Electronics Progress Report Number 133, January 1-December 1990

“…Am. 80 1849-1850(1986 (3) the observed profiles very well. 26 We are planning development of facilities for performing these more experiments to determine the external and tasks/tests and for recording hand actions during internal geometry of the primate fingertip as well the tasks/tests.…”