Excitonic transitions and off-resonant optical limiting in CdS quantum dots stabilized in a synthetic glue matrix

Kurian, Pushpa Ann; Vijayan, C.; Sathiyamoorthy, K.; Suchand Sandeep, C.S.; Philip, Reji

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3448

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DC Field	Value	Language
dc.contributor.author	Kurian, Pushpa Ann	-
dc.contributor.author	Vijayan, C.	-
dc.contributor.author	Sathiyamoorthy, K.	-
dc.contributor.author	Suchand Sandeep, C.S.	-
dc.contributor.author	Philip, Reji	-
dc.date.accessioned	2008-03-19T05:43:05Z	-
dc.date.available	2008-03-19T05:43:05Z	-
dc.date.issued	2007-11	-
dc.identifier.citation	Nanoscale Research Letters, 2007, Vol.2, p561-568	en
dc.identifier.issn	E-ISSN: 1556-276X	-
dc.identifier.issn	P-ISSN: 1931-7573	-
dc.identifier.uri	http://hdl.handle.net/2289/3448	-
dc.description	Article from an open access journal	en
dc.description.abstract	Stable films containing CdS quantum dots of mean size 3.4 nm embedded in a solid host matrix are prepared using a room temperature chemical route of synthesis. CdS/synthetic glue nanocomposites are characterized using high resolution transmission electron microscopy, infrared spectroscopy, differential scanning calorimetry and thermogravimetric analysis. Significant blue shift from the bulk absorption edge is observed in optical absorption as well as photoacoustic spectra indicating strong quantum confinement. The exciton transitions are better resolved in photoacoustic spectroscopy compared to optical absorption spectroscopy. We assign the first four bands observed in photoacoustic spectroscopy to 1s e –1s h , 1p e –1p h , 1d e –1d h and 2p e –2p h transitions using a non interacting particle model. Nonlinear absorption studies are done using z-scan technique with nanosecond pulses in the off resonant regime. The origin of optical limiting is predominantly two photon absorption mechanism.	en
dc.format.extent	338871 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Springer	en
dc.relation.uri	http://dx.doi.org/10.1007/s11671-007-9099-8	en
dc.rights	2007 Springer	en
dc.subject	Exciton	en
dc.subject	Nanomaterials	en
dc.subject	Optical limiting	en
dc.subject	Photoacoustics	en
dc.subject	Nonlinearity	en
dc.title	Excitonic transitions and off-resonant optical limiting in CdS quantum dots stabilized in a synthetic glue matrix	en
dc.type	Article	en
Appears in Collections:	Research Papers (LAMP)

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