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    • Nanoscale Polarization Transient Gratings

    NATURE COMMUNICATIONS（2024）

    Elettra Sincrotrone Trieste SCpA | Univ Trieste | Univ Colorado Colorado Springs | CNR | Max Born Inst Nonlinear Opt & Short Pulse Spect | Ca Foscari Univ Venice

    Cited 0|Views56
    Abstract
    We present the generation of transient polarization gratings at the nanoscale, achieved using a tailored accelerator configuration of the FERMI free electron laser. We demonstrate the capabilities of such a transient polarization grating by comparing its induced dynamics with the ones triggered by a more conventional intensity grating on a thin film ferrimagnetic alloy. While the signal of the intensity grating is dominated by the thermoelastic response of the system, such a contribution is suppressed in the case of the polarization grating. This exposes helicity-dependent magnetization dynamics that have so-far remained hidden under the large thermally driven response. We anticipate nanoscale transient polarization gratings to become useful for the study of any physical, chemical and biological systems possessing chiral symmetry.
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    Optical Gratings,Nanofabrication
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    【要点】：本研究利用定制的FERMI自由电子激光加速器配置，在纳尺度上生成了瞬态极化光栅，揭示了在具有手性对称性的系统中隐藏的磁化动力学。
    

    【方法】：通过对比传统强度光栅与纳尺度瞬态极化光栅在薄膜铁磁合金上诱发的动力学，分析了极化光栅在抑制热弹性响应方面的优势。
    

    【实验】：实验在FERMI自由电子激光设施上进行，使用铁磁合金薄膜作为样品，结果表明瞬态极化光栅能够揭示出在强度光栅作用下被热驱动响应掩盖的螺旋性依赖的磁化动力学。
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