Near-resonant two-photon absorption in luminescent CdTe quantum dots
| dc.contributor.author | Khatei, Jayakrishna | |
| dc.contributor.author | Sandeep, Suchand C.S. | |
| dc.contributor.author | Philip, Reji | |
| dc.contributor.author | Rao, Koteswara KSR | |
| dc.date.accessioned | 2012-04-27T04:18:26Z | |
| dc.date.available | 2012-04-27T04:18:26Z | |
| dc.date.issued | 2012-02-20 | |
| dc.description | Open Access. | en |
| dc.description.abstract | We report the nonlinear optical absorption studies in two differently sized water-soluble cadmium telluride quantum dot (QD) samples, exhibiting first excitonic absorption peaks at 493 nm and 551 nm, respectively. An optical limiting behavior is observed for near-resonant excitation at 532 nm using nanosecond laser pulses, originating from the effective two-photon absorption (TPA) mechanism. The effective TPA coefficient (beta(eff)) is measured to be in the range of 10(-12) m/W. This is one order of magnitude higher than the TPA coefficient (beta) reported for off-resonant excitation. At this excitation wavelength, the smaller QD shows a relatively weaker photoluminescence and stronger nonlinear absorption | en |
| dc.identifier.citation | Applied Physics Letters, 2012, Vol.100, p081901 | en |
| dc.identifier.issn | 0003-6951 | |
| dc.identifier.issn | 1077-3118 (online) | |
| dc.identifier.uri | http://hdl.handle.net/2289/4413 | |
| dc.language.iso | en | en |
| dc.publisher | American Institute of Physics | en |
| dc.relation.uri | http://dx.doi.org/10.1063/1.3689775 | en |
| dc.rights | 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. | en |
| dc.title | Near-resonant two-photon absorption in luminescent CdTe quantum dots | en |
| dc.type | Article | en |