Carrier concentration dependence of optical Kerr nonlinearity in indium tin oxide films |
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Authors: | HI Elim W Ji F Zhu |
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Institution: | (1) Physics Department, National University of Singapore, 2 Science Drive 3, Singapore, Singapore, 117542;(2) Institute of Materials Research and Engineering, 3 Research Link, Singapore, Singapore, 117602 |
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Abstract: | Optical Kerr nonlinearity (n2) in n-type indium tin oxide (ITO) films coated on glass substrates has been measured using Z-scans with 200-fs laser pulses
at wavelengths ranging from 720 to 780 nm. The magnitudes of the measured nonlinearity in the ITO films were found to be dependent
on the carrier concentration with a maximum n2-value of 4.1×10-5 cm2/GW at 720-nm wavelength and an electron density of Nd=5.8×1020 cm-3. The Kerr nonlinearity was also observed to be varied with the laser wavelength. By employing a femtosecond time-resolved
optical Kerr effect (OKE) technique, the relaxation time of OKE in the ITO films is determined to be ∼1 ps. These findings
suggest that the Kerr nonlinearity in ITO can be tailored by controlling the carrier concentration, which should be highly
desirable in optoelectronic devices for ultrafast all-optical switching.
PACS 42.65.An; 42.65.Hw; 78.40.Fy |
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Keywords: | |
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