X-ray absorption and infrared reflectance of poled silica glass for second harmonic generation

Autor:	G. Le Flem, Valérie Briois, Evelyne Fargin, Thierry Buffeteau, C. Cartier dit Moulin, B. Desbat, Virginie Nazabal
Rok vydání:	2000
Předmět:	Materials science Scattering Poling Analytical chemistry General Physics and Astronomy Infrared spectroscopy Second-harmonic generation Fourier transform infrared spectroscopy Absorption (electromagnetic radiation) Spectroscopy Molecular physics XANES
Zdroj:	Journal of Applied Physics. 88:6245-6251
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1321786
Popis:	Structural alterations induced by a thermal poling treatment which is at the origin of second harmonic generation in a Herasil silica glass are studied by x-ray absorption near-edge spectroscopy (XANES). Multiple scattering calculations are performed to explain the experimental O–K edge XANES shape of unpoled surfaces of the glass and then to interpret modifications resulting from poling. The observations are consistent with emergence of disorder by breaking Si–O bridging bonds which are not completely removed by a thermal depoling treatment. Fourier transform infrared spectroscopy shows modifications of nonbridging oxygen bonds which are coherent with a model involving a protons migration during poling. Moreover, a partial anisotropy in the direction of the electrostatic field which is applied during the poling treatment is observed.
Databáze:	OpenAIRE
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