INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Electromagnetic field in an active slab: conditions for spontaneous emission
Autor/es:
M. T. GAREA; M. C. DUPLAÁ; F. E. VEIRAS; L. I. PÉREZ; C. L. MATTEO; P. A. SORICHETTI
Lugar:
Santiago de Compostela
Reunión:
Congreso; ICO 23 Enlightening the future; 2014
Institución organizadora:
International Commission for Optics
Resumen:
In this work we analyze the conditions for the propagation of plane waves emitted spontaneously within an active slab of width d and complex relative permittivity b. The slab is immersed in transparent, semi-infinite media of relative permittivities a and c, respectively, without external field sources ? except, of course, the power source used for pumping the active medium in the slab. It is well known that,if there is enough gain in the active medium, it may sustain the so-called spontaneous electromagnetic field. For many applications it is important to avoid this condition. Active media may be classically described by a complex permittivity, with its the imaginary part opposite in sign to that in usual dissipative materials. Linear propagation of electromagnetic fields in active media can be assumed for small amplitudes, where the gain may be considered as independent of the electric field. It must be remarked that in this work we will study the conditions for the onset of spontaneous emission at a given frequency, and therefore we consider the complex permittivity as a parameter, neglecting saturation effects.