用超快会聚束电子衍射探测双层系统中的定制纳米声子波场

IF 2.3 2区 物理与天体物理 Q3 CHEMISTRY, PHYSICAL
N. Bach, A. Feist, M. Möller, C. Ropers, S. Schäfer
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引用次数: 1

摘要

光激发纳米结构为产生具有不同自由度之间的潜在(非线性)相互作用的受限纳米声子场提供了一个通用平台。由于纳米级几何结构和界面耦合机制的相互作用,共振频率的控制和声模式的选择性激发仍然具有挑战性。在这里,我们证明了具有铂条纹图案的半导体膜作为高频应变波的定制源,产生通过膜传播的多模态畸变波。为了在与沉积金属条一定距离处局部监测超快结构动力学,我们采用激光泵浦/电子探针方案中的超快会聚束电子衍射。在连续介质模型中,通过数值模拟再现了实验观察到的声学变形,揭示了晶格动力学的时空演化,该演化由局部旋转主导,应变和剪切贡献较小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tailored nanophononic wavefield in a patterned bilayer system probed by ultrafast convergent beam electron diffraction
Optically excited nanostructures provide a versatile platform for the generation of confined nanophononic fields with potential (non-)linear interactions between different degrees of freedom. Control of resonance frequencies and the selective excitation of acoustic modes still remains challenging due to the interplay of nanoscale geometries and interfacial coupling mechanisms. Here, we demonstrate that a semiconductor membrane patterned with a platinum stripe acts as a tailored source for high-frequency strain waves generating a multi-modal distortion wave propagating through the membrane. To locally monitor the ultrafast structural dynamics at a specific distance from the deposited metal stripe, we employ ultrafast convergent beam electron diffraction in a laser-pump/electron-probe scheme. Experimentally observed acoustic deformations are reproduced by numerical simulations in a continuous medium model, revealing a spatiotemporal evolution of the lattice dynamics dominated by local rotations with minor strain and shear contributions.
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来源期刊
Structural Dynamics-Us
Structural Dynamics-Us CHEMISTRY, PHYSICALPHYSICS, ATOMIC, MOLECU-PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
CiteScore
5.50
自引率
3.60%
发文量
24
审稿时长
16 weeks
期刊介绍: Structural Dynamics focuses on the recent developments in experimental and theoretical methods and techniques that allow a visualization of the electronic and geometric structural changes in real time of chemical, biological, and condensed-matter systems. The community of scientists and engineers working on structural dynamics in such diverse systems often use similar instrumentation and methods. The journal welcomes articles dealing with fundamental problems of electronic and structural dynamics that are tackled by new methods, such as: Time-resolved X-ray and electron diffraction and scattering, Coherent diffractive imaging, Time-resolved X-ray spectroscopies (absorption, emission, resonant inelastic scattering, etc.), Time-resolved electron energy loss spectroscopy (EELS) and electron microscopy, Time-resolved photoelectron spectroscopies (UPS, XPS, ARPES, etc.), Multidimensional spectroscopies in the infrared, the visible and the ultraviolet, Nonlinear spectroscopies in the VUV, the soft and the hard X-ray domains, Theory and computational methods and algorithms for the analysis and description of structuraldynamics and their associated experimental signals. These new methods are enabled by new instrumentation, such as: X-ray free electron lasers, which provide flux, coherence, and time resolution, New sources of ultrashort electron pulses, New sources of ultrashort vacuum ultraviolet (VUV) to hard X-ray pulses, such as high-harmonic generation (HHG) sources or plasma-based sources, New sources of ultrashort infrared and terahertz (THz) radiation, New detectors for X-rays and electrons, New sample handling and delivery schemes, New computational capabilities.
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