Nonlinear characterization of PbS nanocrystals embedded in sol-gel planar waveguides

Jochen Fick; Jochen Schell; Alessandro Martucci; Massimo Guglielmi

doi:10.1117/12.343730

26 March 1999 Nonlinear characterization of PbS nanocrystals embedded in sol-gel planar waveguides

Jochen Fick, Jochen Schell, Alessandro Martucci, Massimo Guglielmi

Proceedings Volume 3620, Integrated Optics Devices III; (1999) https://doi.org/10.1117/12.343730
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

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.

Citation Download Citation

Jochen Fick, Jochen Schell, Alessandro Martucci, and Massimo Guglielmi "Nonlinear characterization of PbS nanocrystals embedded in sol-gel planar waveguides", Proc. SPIE 3620, Integrated Optics Devices III, (26 March 1999); https://doi.org/10.1117/12.343730

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