What is it about?

GeSe exhibits in-plane optical anisotropy similar to black phosphorus and other two-dimensional materials, so it is believed to have remarkable nonlinear optical (NLO) properties. In this work, amorphous GeSe films were prepared by vacuum thermal evaporation. After annealing at 450℃, GeSe films exhibited a polycrystalline phase. The NLO properties of these GeSe films were investigated by the Z-scan technique.

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Why is it important?

The results indicated that GeSe films exhibited typical reverse saturable absorption (RSA) and self-focusing phenomenon. It was also found that the nonlinear optical parameters and laser-induced damage threshold of annealed recrystallized GeSe films were significantly improved.


These results reveal that the polycrystalline GeSe film is a promising solid-state NLO material for application in optical limiting devices and laser protection.

jiayu zhang
Southeast University

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This page is a summary of: Nonlinear optical response of polycrystalline GeSe films, Applied Physics Letters, June 2023, American Institute of Physics,
DOI: 10.1063/5.0151433.
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