Selective filling of photonic crystal fibres

Stimulated Raman scattering in hollow core photonic crystal fibres

“…This ensures a proper filling of the fibre without any air bubbles. To estimate the time that is necessary to fill our fibres we have used the theory of capillaries filling that gives the filled length L versus time t for a given radius a of the capillary [7]. In Figure 2 we have plotted L versus t for different values of a and for ethanol.…”

Microstructured Optical Fibers Filled with Carbon Nanotubes: Photonic Bandgap Modification and Sensing Applications

“…As matter of fact, the microstructuration of the substrate, constituted by the MOF, affects the deposition process in light of the micrometric dimensions of the MOF holes enabling capillarity phenomena (Nielsen et al 2005;Zhmud et al 2000). During the vertical MOF dipping, performed with the rate of 3 mm/min and for a depth of 1mm, it is expected that the LB suspension penetrates within the MOF holes for effect of the dipping itself and at the same time rises within the MOF holes for capillarity.…”

Liquid Crystals into Planar Photonic Crystals

“…Indeed, it has been demonstrated both theoretically and experimentally that a low ambient pressure is beneficial to the infiltration process since it minimizes the effects of gas trapping in the LCs and contributes to drastically reduce the air volume that remains eventually encapsulated at the hole bottom (Leonard et al, 2000;Schuller et al, 2003;van der Heijden et al, 2006a-b). The residual air content is finally degassed through the LC column (Nielsen et al, 2005;van der Heijden et al, 2006a-b). Infiltration times of several minutes up to few hours were adopted in order to guarantee a complete gas evacuation and thus a perfect hole infiltration.…”