Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/95297
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dc.contributor.authorXing, Guichuanen
dc.contributor.authorLiao, Yileen
dc.contributor.authorWu, Xiangyangen
dc.contributor.authorChakrabortty, Sabyasachien
dc.contributor.authorLiu, Xinfengen
dc.contributor.authorYeow, Edwin Kok Leeen
dc.contributor.authorSum, Tze Chienen
dc.contributor.authorChan, Yinthaien
dc.date.accessioned2013-01-07T06:32:43Zen
dc.date.accessioned2019-12-06T19:12:04Z-
dc.date.available2013-01-07T06:32:43Zen
dc.date.available2019-12-06T19:12:04Z-
dc.date.copyright2012en
dc.date.issued2012en
dc.identifier.citationXing, G., Liao , Y., Wu , X., Chakrabortty, S., Liu, X., Yeow, E. K. L., et al. (2012). Ultralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructures. ACS Nano, 6 (12), 10835–10844.en
dc.identifier.urihttps://hdl.handle.net/10356/95297-
dc.description.abstractUltralow threshold two-photon pumped amplified spontaneous emission (2ASE) and lasing in seeded CdSe/CdS nanodot/nanorod heterostructures is demonstrated for the first time. Such heterostructures allow the independent tunability of the two-photon absorption (2PA) cross-section (σ2) through varying the CdS rod size, and that of the emission wavelength through varying the CdSe dot size. With an enhanced σ2, 2ASE in these heterostructures is achieved with an ultralow threshold fluence of ~1.5 mJ/cm2 – which is as much as one order less than that required for spherical semiconductor NCs. Importantly, by exploiting this unique property of the seeded nanorods exhibiting strong quantum confinement even at relatively large rod sizes, a near reciprocal relation between the 2ASE threshold and the 2PA action cross-section (σ2η) (where η is the quantum yield) was found and validated over a wide volume range for II-VI semiconductor nanostructures. Ultrafast optical spectroscopy verified that while the Auger processes in these heterostructures are indeed suppressed, ASE in these samples could also be strongly affected by a fast hole trapping process to the NR surface states. Lastly, to exemplify the potential of these seeded CdSe/CdS nanodot/nanorod heterostructures as a viable gain media for achieving two-photon lasing, a highly photostable microsphere laser with an ultralow pump threshold is showcased.en
dc.language.isoenen
dc.relation.ispartofseriesACS nanoen
dc.rights© 2012 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Nano, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1021/nn304200a].en
dc.subjectDRNTU::Science::Mathematics::Discrete mathematics::Theory of computationen
dc.titleUltralow-threshold two-photon pumped amplified spontaneous emission and lasing from seeded CdSe/CdS nanorod heterostructuresen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen
dc.identifier.doi10.1021/nn304200aen
dc.description.versionAccepted versionen
dc.identifier.rims167995en
item.grantfulltextopen-
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