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|Title: ||Optical nonlinearity in lead sulfide microtowers|
|Authors: ||Tamilselvan, V.|
Rao, Narasimha K.
|Issue Date: ||29-Sep-2010 |
|Publisher: ||IOP Publishing Ltd.|
|Citation: ||Journal of Physics D: Applied Physics, 2010, Vol.43, 385402|
|Abstract: ||Lead sulfide (PbS) microtowers on silicon substrates, having the physical properties of bulk PbS, have been synthesized. Optical nonlinearity studies using the open aperture z-scan technique employing 5 ns and 100 fs laser pulses reveal effective two-photon type absorption. For nanosecond excitation the nonlinear absorption coefficients (βeff) are in the order of 10−11 m W−1, two orders of magnitude less than the values reported for quantum confined PbS nanocrystals. For femtosecond excitation βeff is of the order of 10−14 m W−1. These results obtained in bulk PbS experimentally confirm the importance of quantum confinement in the enhancement of optical nonlinearities in semiconductor materials|
|Description: ||Restricted Access.|
|Alternative Location: ||http://iopscience.iop.org/0022-3727/43/38/385402|
|Copyright: ||2010 IOP Publishing Ltd.|
|Appears in Collections:||Research Papers (LAMP)|
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