Sol–gel fabrication of thick multilayers applied to Bragg reflectors and microcavities

Rare-earth photoluminescence in sol–gel derived confined glass structures

“…The electric field of the emitted light beam whose wavelengths match the cavity position is enhanced by a quantity corresponding to the quality factor (Q) of the cavity [25], due to multiple reflections inside the defect layer. Defects in microcavities can also be doped with RE elements, like erbium and, when the emitted light is resonant with the cavity, the Er 3+ PL intensity will be enhanced by its Q factor [19,26]. Excitation can be provided by an argon ion or an IR diode laser at 980 nm, for example.…”

Rare-earth-doped silica-based glasses for photonic applications

“…If an atom is placed inside such a structure, the atom cannot radiate away energy if its transition frequency falls within the photonic bandgap, and thus spontaneous-emission can be completely inhibited. The Bragg reflector is a powerful component to fabricate dielectric rare-earth-activated 1-D PBGs and microcavities [8]. In the following example, an one-dimensional cavity is realized by an Er 3+ -activated dielectric layer placed between two distributed Bragg reflectors (DBRs).…”

Advances in original fibres fabrication using innovative techniques

“…This wet chemical method allows to fabricate very thin films with a very high homogeneity and purity at low processing temperature (Rabaste et al 2002;Almeida et al 2003Almeida et al , 2004Zhang et al 2000;Doeuff et al 1987).…”