TY - JOUR
T1 - Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons
AU - Kurman, Yaniv
AU - Dahan, Raphael
AU - Sheinfux, Hanan Herzig
AU - Wang, Kangpeng
AU - Yannai, Michael
AU - Adiv, Yuval
AU - Reinhardt, Ori
AU - Tizei, Luiz H.G.
AU - Woo, Steffi Y.
AU - Li, Jiahan
AU - Edgar, James H.
AU - Kociak, Mathieu
AU - Koppens, Frank H.L.
AU - Kaminer, Ido
N1 - Publisher Copyright:
© 2021 American Association for the Advancement of Science. All rights reserved.
PY - 2021/6/11
Y1 - 2021/6/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85107726450&partnerID=8YFLogxK
U2 - 10.1126/science.abg9015
DO - 10.1126/science.abg9015
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C2 - 34112689
AN - SCOPUS:85107726450
SN - 0036-8075
VL - 372
SP - 1181
EP - 1186
JO - Science
JF - Science
IS - 6547
ER -