Pulse duration dependence of the third order optical nonlinearity of a cadmium sulfide dendrimer nanocomposite

Autor:	Mary Potasek, Roger Dorsinville, Ardie D. Walser, Michael Etienne, Valeria Balogh-Nair
Rok vydání:	2007
Předmět:	Optics Chemistry Quantum dot business.industry Picosecond Excited state Femtosecond Pulse duration Nonlinear optics Z-scan technique business Ultrashort pulse Molecular physics
Zdroj:	SPIE Proceedings.
ISSN:	0277-786X
DOI:	10.1117/12.703186
Popis:	Open and close aperture Z-scans were performed on various CdS quantum dots embedded in either generation 4 (G4) and G5 poly(propyleneimine) dendrimer films using picosecond and femtosecond pulses between 350 nm and 1 mm. The films had an average thickness of 400nm. The measured values of the third order nonlinear coefficient were among the highest off-resonance nonlinearities reported for organic and/or hybrid composites materials. However, the nonlinear response with picosecond pulses were about an order of magnitude higher than the femtosecond counterpart. We show that the nonlinear response in these materials is also a function of the dynamics of the excited states involved and that measurements of the nonlinear optical coefficient with pulses of different duration is directly correlated to the dynamics of the excited states.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::42b276b7f81291f7508b8b8a741d0080 https://doi.org/10.1117/12.703186 Zobrazit plný text záznamu