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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.
ISSN: 0003-6951
1077-3118 (online)
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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)

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