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Laser stimulated nonlinear optics of Ag nanoparticle-loaded poriferous TiO2 microtablet

Nafisah S., Saad S. K. M., Umar A. A., Plucinski K., Lis M., Maciaga A., Miedzinski R.

Optica Applicata

2015

Vol. 45, nr 2

263--271

The studies of the photoinduced second harmonic generation were performed for the Ag-loaded poriferous TiO2 microtablets deposited on an ITO substrate. The poriferous TiO2 microtablets on a pre-cleaned ITO substrate (Kaivo, China, sheet resistance of ca. 10 Ω/square) were prepared by simply immersing the ITO substrate vertically into the growth solution that contains 5 ml of 0.5 M (NH4)2TiF6 (Sigma-Aldrich) and 5 ml of 1.0 M H3BO3 (R.M. Chemicals) for 15 h at room temperature. The samples were obtained from the growth solution with concentration of 0.4, 0.5 and 0.6 M. We have found that maximal second harmonic generation signal was achieved for the samples with concentration 0.5 M.

Infrared second-order nonlinear optical effect in Sb2Te3-SrBr2-PbCl2 glass

Gruhn W.

Optica Applicata

2005

Vol. 35, nr 3

329-336

A phenomenological and microscopic theory of IR picosecond nonlinear optical response in glass is developed for the middle IR spectral range (5-15 um). Both IR-induced second harmonic generation (SHG) as welt as linear electrooptic effect (LEOE) were observed. The observed effects are explained within a framework of fifth-order nonlinear optical susceptibilities. A model that reproduces the basic features of the experimental data, in which are discovered the optical nonlinearities caused by photoinduced electron-phonon anharmonic interactions, is proposed. The role of the IR induced phase matching conditions in the observed phenomena is discussed.