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Proceedings Paper

Nonlinear characterization of PbS nanocrystals embedded in sol-gel planar waveguides
Author(s): Jochen Fick; Jochen Schell; Alessandro Martucci; Massimo Guglielmi
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Paper Abstract

Thin silica-titania planar waveguides doped with different concentrations of lead sulfide (10 - 25 mol%) have been prepared by a sol-gel process. It consist of three steps: (a) preparation of a colloidal sol of semiconductor particles; (b) preparation of an alkoxide solution, precursor of the glass- like matrix; (c) mixing of the colloidal sol and the alkoxide solution. Films were deposited on fused silica by dipping and densified for 1 h at 300 degrees Celsius in nitrogen. The mean particle size is 3 nm and the optical absorption edge is situated around 1100 nm. The nonlinear properties have been investigated using degenerated four wave mixing (DFWM) an a nonlinear m-line technique. Different Nd:YAG lasers with pico- and nanosecond pulses at 1064 nm have been used. Depending on the PbS concentration we measured a high negative nonlinear refractive index of n2 equals -3 to -9 10-8 cm2kW for nanosecond pulses (m-lines) and -1 to -10 10-10 cm2/kW for picosecond pulses (m-lines and DFWM). The response time of the nonlinearity is below 30 ps. All observed nonlinear effects are fully reversible and we did not observe any photodarkening. Straight, monomode channel waveguides have been fabricated on theses films.

Paper Details

Date Published: 26 March 1999
PDF: 8 pages
Proc. SPIE 3620, Integrated Optics Devices III, (26 March 1999); doi: 10.1117/12.343730
Show Author Affiliations
Jochen Fick, ENSERG (France)
Jochen Schell, IPCMS (Germany)
Alessandro Martucci, Univ. degli Studi di Padova (Italy)
Massimo Guglielmi, Univ. degli Studi di Padova (Italy)


Published in SPIE Proceedings Vol. 3620:
Integrated Optics Devices III
Giancarlo C. Righini; S. Iraj Najafi, Editor(s)

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