Three-dimensional vectorial imaging of surface phonon polaritons

doi:10.1126/science.abg0330

GSTDTAP > 气候变化

DOI	10.1126/science.abg0330
	Three-dimensional vectorial imaging of surface phonon polaritons
	Xiaoyan Li; Georg Haberfehlner; Ulrich Hohenester; Odile Stéphan; Gerald Kothleitner; Mathieu Kociak
	2021-03-26
发表期刊	Science
出版年	2021
英文摘要	Atomic vibrations (phonons) govern many physical properties of materials, especially those related to heat and thermal transport. They also provide fingerprints of the chemistry of a wide variety of materials, from solids to molecules. The behavior of phonons in nanostructures can be appreciably modified because of confinement effects. Li et al. combined several electron microscopy techniques to map out the phonon-polariton excitations across the surface of magnesium oxide nanostructures with high spatial, spectral, and angular resolution. The reconstruction of the surface excitation maps in three dimensions will be useful for understanding and optimizing the properties of the nanostructured materials for advanced functionality. Science , this issue p. [1364][1] Surface phonon polaritons (SPhPs) are coupled photon-phonon excitations that emerge at the surfaces of nanostructured materials. Although they strongly influence the optical and thermal behavior of nanomaterials, no technique has been able to reveal the complete three-dimensional (3D) vectorial picture of their electromagnetic density of states. Using a highly monochromated electron beam in a scanning transmission electron microscope, we could visualize varying SPhP signatures from nanoscale MgO cubes as a function of the beam position, energy loss, and tilt angle. The SPhPs’ response was described in terms of eigenmodes and used to tomographically reconstruct the phononic surface electromagnetic fields of the object. Such 3D information promises insights in nanoscale physical phenomena and is invaluable to the design and optimization of nanostructures for fascinating new uses. [1]: /lookup/doi/10.1126/science.abg0330
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/321100
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Xiaoyan Li,Georg Haberfehlner,Ulrich Hohenester,et al. Three-dimensional vectorial imaging of surface phonon polaritons[J]. Science,2021.
APA	Xiaoyan Li,Georg Haberfehlner,Ulrich Hohenester,Odile Stéphan,Gerald Kothleitner,&Mathieu Kociak.(2021).Three-dimensional vectorial imaging of surface phonon polaritons.Science.
MLA	Xiaoyan Li,et al."Three-dimensional vectorial imaging of surface phonon polaritons".Science (2021).