Recently some papers reported with I-scan to evaluate the nonlinearity of the materials. What are the advancements through the I-scan technique?
The transmission Z-scan method is based on the scanning of the sample relative to the focal plane of a lens . The refractiveindex lens effect is monitored during the is placement of the sample, by a detectorplaced behind the sample, in the far field, with an aperture in front of it (closedaperture Z-scan). Thus, the variable focusing / defocusing due to the light inducedlens inside the sample is measured.
The necessity of I-scan development originates from its advantages. Firstly, in the Z-scan method one will have different illuminated areas of the sample due to the scan of it relative to the focal plane. This could be a problem in the case of inhomogeneous samples, where a different area of the sample will be measured at each scan distance, leading to very inconsistent data. Also a major advantage of this method is that the sample is no longer passing through the focus and the probability of damaging is lowered. Another huge advantage came from the fact that by using this method it is easier to observe high-order effects from a single experiment.
If to speak very briefly, the transmission Z-scan method is based on the scanning
of the sample relative to the focal plane of a lens. The refractive index lens effect
is monitored during the displacement of the sample, in the far field, with on aperture
front of it. Thus the variable focusing/defocusing due to the light induced lens inside
the sample is measured. I-scan was developed as a variant of Z-scan method.
In this method the sample is kept in fixed position and the incident intensity is changed using optical attenuators.
The advantages of I-scan are the following: in the Z-scan method one will have different illuminated areas of the sample due to the scan of it relative to the focal plane. This could be a problem in the case of inhomogeneous samples, where a different area of the sample will be measured at each scan distance, leading to very inconsistent data; also a major advantage of this method is that the sample is no longer passing through the focus and the probability of damaging is lowered; another huge advantage came from the fact that by using this method it is easier to observe high-order effects.
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