Wave propagation and optical properties in slabs with light-induced free-charge-carriers

A. LENCINA; P. VAVELIUK; B. RUIZ; M. TEBALDI; N. BOLOGNINI

PHYSICAL REVIEW E - STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS

The American Physical Society (APS)

Lugar: Washington; Año: 2006 vol. 74 p. 56614 - 56623

1063-651X

A Theoretical analysis on wave propagation and optical properties of slab with light-induced fre charge carriers within a Fabry-Perot framework is presented. The key of the analysis is to attack the wave propagation problem in terms of the time-averaged Pointing vector modulus within the medium through an alternative approach. This fact allows coupling the microscopic (free charge rate) and macroscopic (electromagnetic field evolution) equations self-consistently by means of the non-linear permittivity and conductivity, which, in turn, depend on the time-averaged Pointing vector modulus. Thereby, the transmittance, reflectance and absoptive power are derived as functions of the pump intensity and medium thickness. Bistable behaviour is found at relatively high excitation intensity for positive values of the non linear permitttivity coefficient. The bistability enhances for increasing values of such coefficient and weakens for increasing values of non-linear photoconductivity coefficient. On the contrary, for negative non-linear permitivity coefficient, biestability does not appear possessing these media mirror like behavior. Some posible applications are suggested.