Light propagation scattering in porous silicon nanocomposite waveguides

Parastesh Pirasteh (1) , Joël Charrier (1) , Yannick Dumeige (1) , Pierre Joubert (1) , Severine Haesaert (1) , Annick Chaillou (1) , Lazhar Haji (1) , P. Le Rendu (2) , Thien-Phap Nguyen (2)

1 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
2 IMN - Institut des Matériaux Jean Rouxel

Planar waveguides have been achieved from oxidised porous silicon layers (OPS) which have been impregnated by solvents, Congo Red (CR) dye and poly(p-phenylene vinylene) (PPV) polymer. Optical loss has been investigated by a simple technique based on surface optical scattering measurements. Optical loss has been studied as a function of the wavelength, impregnation type and CR concentration. The main sources of attenuation, such as absorption, scattering from interface roughness, scattering from nano- crystallites and modification of the refractive indexes after filling are discussed. Optical loss measured at 0.633 µm is about 1.8 dB/cm for the OPS waveguides The optical loss decreases with wavelength. Otherwise, the optical loss increases with the concentration of Congo Red dye which is absorbent at this wavelength.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Optique [physics.optics]

Parastesh Pirasteh, Joël Charrier, Yannick Dumeige, Pierre Joubert, Severine Haesaert, et al.. Light propagation scattering in porous silicon nanocomposite waveguides. physica status solidi (a), 2005, Vol.202 (Issue 8), pp.1712-1716. ⟨10.1002/pssa.200461238⟩. ⟨hal-00023523⟩