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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Synthesis of Hierarchical ZnO/CdSSe Heterostructure Nanotrees
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Surface structure evolution and Raman response for multipulse, few-cycle, laser damaged ZnSe.

Yingjie Chai, Xiaoming Yu, He Cheng

    Optics Express
    |May 14, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Polycrystalline zinc selenide (ZnSe) surfaces subjected to intense laser pulses show grain boundaries initiating damage and ripple formation. Thermal properties change with increasing laser irradiations, indicating material modification.

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    Area of Science:

    • Materials Science
    • Laser Physics
    • Surface Science

    Background:

    • Understanding laser-induced material modifications is crucial for applications in optics and material processing.
    • Polycrystalline materials exhibit unique responses to laser irradiation due to grain boundaries.

    Purpose of the Study:

    • To investigate the evolution of surface damage morphologies on polycrystalline zinc selenide (ZnSe) under ultrashort laser pulses.
    • To identify the initiation sites of damage and ripple formation.
    • To analyze changes in material properties post-irradiation.

    Main Methods:

    • Irradiation of ZnSe with multiple 11-fs infrared, few-cycle laser pulses.
    • Surface characterization using Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM).
    • Analysis of crystalline changes and phase transitions via confocal Raman spectroscopy.
    • Thermal property evaluation using AFM thermal tip testing.

    Main Results:

    • Polycrystalline grain boundaries identified as initiation sites for surface damage and ripple formation.
    • Observed evolution and organization of surface ripples with increasing laser pulse counts.
    • Slight increase in thermal expansion coefficient in ablated zones compared to non-ablated zones.
    • Evidence of crystalline changes and material phase transitions.

    Conclusions:

    • Laser-induced surface damage on ZnSe initiates at grain boundaries and evolves with cumulative irradiation.
    • Surface ripple formation and modification of thermal properties are directly linked to the number of laser pulses.
    • The study provides insights into laser-matter interactions in polycrystalline semiconductors.