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Related Concept Videos

Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

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Related Experiment Video

Updated: Jun 7, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization
08:19

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Intrinsic optical bistability in layered crystals.

B Ratajska-Gadomska, W Gadomski

    Applied Optics
    |November 6, 2010
    PubMed
    Summary

    Parametric excitation in Gallium Selenide (GaSe) crystals creates bistability in refractive index and optical fields. This effect is more pronounced in layered crystals compared to those with higher symmetry.

    Area of Science:

    • Solid-state physics
    • Nonlinear optics
    • Materials science

    Background:

    • Parametric excitation is a phenomenon where a system's parameters oscillate, leading to amplified responses.
    • Biharmonic optical fields involve two distinct frequencies interacting within a material.
    • Gallium Selenide (GaSe) is a layered semiconductor with unique optical properties.

    Purpose of the Study:

    • To investigate the parametric excitation of low-frequency overtones in GaSe crystals.
    • To analyze the resulting bistability in optical properties and generated fields.
    • To compare the strength of this effect in layered versus higher-symmetry crystals.

    Main Methods:

    • Theoretical modeling of parametric excitation in GaSe under biharmonic optical fields.

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    Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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    Published on: April 14, 2020

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    Last Updated: Jun 7, 2026

    Patterning via Optical Saturable Transitions - Fabrication and Characterization
    08:19

    Patterning via Optical Saturable Transitions - Fabrication and Characterization

    Published on: December 11, 2014

    Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
    07:24

    Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

    Published on: April 14, 2020

  • Analysis of four-wave-mixing processes to observe generated optical fields.
  • Comparative study of optical bistability in GaSe and other crystal structures.

    • Main Results:

    • Parametric excitation of low-frequency overtones in GaSe leads to bistability.
    • Both the crystal refractive index and the four-wave-mixing generated optical field exhibit bistability.
    • The observed bistability is significantly stronger in layered GaSe crystals than in crystals with higher symmetry.

    Conclusions:

    • Layered crystal structures, like GaSe, exhibit enhanced nonlinear optical phenomena.
    • Biharmonic optical field excitation provides a route to achieving optical bistability in semiconductors.
    • The findings have implications for optical switching and signal processing applications in nonlinear optics.