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http://hdl.handle.net/2289/4413| Title: | Near-resonant two-photon absorption in luminescent CdTe quantum dots |
| Authors: | Khatei, Jayakrishna Sandeep, Suchand C.S. Philip, Reji Rao, Koteswara KSR |
| Issue Date: | 20-Feb-2012 |
| Publisher: | American Institute of Physics |
| Citation: | Applied Physics Letters, 2012, Vol.100, p081901 |
| 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 |
| Description: | Open Access. |
| URI: | http://hdl.handle.net/2289/4413 |
| ISSN: | 0003-6951 1077-3118 (online) |
| Alternative Location: | http://dx.doi.org/10.1063/1.3689775 |
| Copyright: | 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. |
| Appears in Collections: | Research Papers (LAMP) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2012_APL_100_081901.pdf | Open Access. | 837.37 kB | Adobe PDF | View/Open |
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