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|Title:||Near-resonant two-photon absorption in luminescent CdTe quantum dots|
Sandeep, Suchand C.S.
Rao, Koteswara KSR
|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|
|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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