Browsing by Author "Lee, M. -T."

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Spectral dependence of third-order nonlinear optical properties in InN
(2014-05-19)
Ahn, H.
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Lee, M. -T.
;
Chang, Y. -M.
;
光電工程學系
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Department of Photonics
We report on the nonlinear optical properties of InN measured in a wide near-infrared spectral range with the femtosecond Z-scan technique. The above-bandgap nonlinear absorption in InN is found to originate from the saturation of absorption by the band-state-filling and its cross-section increases drastically near the bandgap energy. With below-bandgap excitation, the nonlinear absorption undergoes a transition from saturation absorption (SA) to reverse-SA (RSA), attributed to the competition between SA of band-tail states and two-photon-related RSA. The measured large nonlinear refractive index of the order of 10(-10) cm(2)/W indicates InN as a potential material for all-optical switching and related applications. (C) 2014 AIP Publishing LLC.