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|Title:||Fast and reversible excited state absorption in II-VI-based nanocomposite thin films|
|Publisher:||AMER INST PHYSICS|
|Citation:||APPLIED PHYSICS LETTERS, 87(6), -|
|Abstract:||Nanocomposite CdS-ZnO thin films deposited directly on quartz substrates by high-pressure magnetron sputtering show a completely reversible photodarkening at a very low threshold intensity (similar to 1 kWcm(-2)), and a moderately fast recovery time (< 1 ms). This makes them ideal in optical limiting applications for both continuous wave as well as high rep-rate pulsed lasers. The same system also shows an intensity-dependent quenching of the photoluminescence. Using a pump-probe experiment, we show that photodarkening in such a quantum-dot thin film originates from excited state absorption. (c) 2005|
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