Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons

doi:10.1126/science.abg9015

GSTDTAP > 气候变化

DOI	10.1126/science.abg9015
	Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons
	Yaniv Kurman; Raphael Dahan; Hanan Herzig Sheinfux; Kangpeng Wang; Michael Yannai; Yuval Adiv; Ori Reinhardt; Luiz H. G. Tizei; Steffi Y. Woo; Jiahan Li; James H. Edgar; Mathieu Kociak; Frank H. L. Koppens; Ido Kaminer
	2021-06-11
发表期刊	Science
出版年	2021
英文摘要	Two-dimensional (2D) materials can confine light to volumes much shorter than the wavelength, and, together, the long propagation lengths make them attractive materials for developing nanophotonic platforms. Characterizing the spatiotemporal control of 2D polariton wave packets has been hindered for the same reasons that make their potential applications exciting: They have extremely small wavelengths and are strongly confined inside the material. Kurman et al. developed a new pump-probe technique based on electron emission that provides access to the spatiotemporal dynamics of 2D polaritons. The nanometric spatial resolution and femtosecond temporal resolution will be useful for probing the excitation dynamics of these materials. Science , abg9015, this issue p. [1181][1] Coherent optical excitations in two-dimensional (2D) materials, 2D polaritons, can generate a plethora of optical phenomena that arise from the extraordinary dispersion relations that do not exist in regular materials. Probing of the dynamical phenomena of 2D polaritons requires simultaneous spatial and temporal imaging capabilities and could reveal unknown coherent optical phenomena in 2D materials. Here, we present a spatiotemporal measurement of 2D wave packet dynamics, from its formation to its decay, using an ultrafast transmission electron microscope driven by femtosecond midinfrared pulses. The ability to coherently excite phonon-polariton wave packets and probe their evolution in a nondestructive manner reveals intriguing dispersion-dependent dynamics that includes splitting of multibranch wave packets and, unexpectedly, wave packet deceleration and acceleration. Having access to the full spatiotemporal dynamics of 2D wave packets can be used to illuminate puzzles in topological polaritons and discover exotic nonlinear optical phenomena in 2D materials. [1]: /lookup/doi/10.1126/science.abg9015
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/329910
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Yaniv Kurman,Raphael Dahan,Hanan Herzig Sheinfux,et al. Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons[J]. Science,2021.
APA	Yaniv Kurman.,Raphael Dahan.,Hanan Herzig Sheinfux.,Kangpeng Wang.,Michael Yannai.,...&Ido Kaminer.(2021).Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons.Science.
MLA	Yaniv Kurman,et al."Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons".Science (2021).