File:PolaritonImaging.jpg

Figure 3: Frames from a phonon-polariton movie of broadband phonon-polariton generation and propagation in lithium niobate taken with real-space imaging. The first frame shows the initial phonon-polaritons at the time of generation. Immediately afterwards, wavepackets travel away from the excitation region in both directions. The second frame, taken 30 ps after generation, shows two phonon-polaritons traveling to the right. The first (left) is the reflection of the initial left-going wavepacket and the other was initially traveling to the right.