The intensity-dependent nonlinear
absorption and refraction characteristics of crystalline InSb thin films are
investigated by z-scan method at 405 nm laser wavelength. Results show that the
nonlinear absorption coefficient of crystalline InSb thin films is in the order
of ~ + 10−2 m W−1, and the nonlinear refractive index is in the order of ~ +
10−9 m2 W−1. Variable-temperature ellipsometric spectroscopy measurements and
electronic process analyses as well as theoretical calculations are employed to
discuss the internal mechanisms responsible for the giant optical nonlinearity.
Analysis results indicate that the nonlinear absorption mainly stems from the
laser-induced free-carrier absorption effect, whereas the nonlinear refraction
is mainly from thermal effect due to band gap shrinking and carrier effect due
to the transition process of electrons, respectively. These characteristics may
be responsible for the super-resolution effect in nano-optical information
storage.
Source:IOPscience
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