Resonant effects in optical second-harmonic generation from alkali covered Si(111) 7 × 7

Autor:	H.-G. Rubahn, Vladimir Bordo, J. Zhang, G. Marowsky
Rok vydání:	2005
Předmět:	Wavelength Adsorption Materials science business.industry Perpendicular General Physics and Astronomy Optoelectronics Second-harmonic generation Radiation Alkali metal business Molecular physics Surface reconstruction
Zdroj:	Europhysics Letters (EPL). 69:61-67
ISSN:	1286-4854 0295-5075
Popis:	Polarized second-harmonic generation (SHG) coverage dependencies for alkali (Na, Li) adsorption on Si(111) 7 × 7 both at room and at low temperatures are obtained for fundamental wavelengths of 497 nm, 570 nm and 1067 nm, showing characteristic and reproducible non-monotonic changes of SHG efficiency. At submonolayer coverage the SHG intensities are qualitatively different for visible vs. near-resonant IR radiation. In the coverage regime θ < 1/3, low-symmetry Na-Si bonds, resulting from a Na-induced surface reconstruction, are formed, which are resonant with 1067 nm radiation. By comparing parallelly and perpendicularly polarized coverage dependencies, we deduce that the resonant contribution in the parallel configuration is due to the χzzz(2)-component.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::64e53d575809b7ef8c385ef36bad76a3 https://doi.org/10.1209/epl/i2004-10301-8 Zobrazit plný text záznamu