Speaker
Description
Ultrafast electron diffraction (UED) provides atomic-scale access to transient structural dynamics, yet its temporal resolution is fundamentally constrained by finite electron bunch durations and pump–probe timing jitter. We introduce a THz-streaking approach that overcomes these limitations by using a high-gradient (~1 GV m⁻¹) THz deflecting field synchronized with the diffraction process. The transient THz field angularly streaks the femtosecond diffraction pattern, mapping temporal information onto a spatial coordinate on the detector. This time-to-space encoding enables single-shot retrieval of attosecond dynamics without requiring sub-femtosecond electron pulses or stringent synchronization. Particle-tracking simulations demonstrate that the temporal resolution can be effectively decoupled from both electron bunch duration and timing jitter. This approach extends UED into the attosecond regime and enables direct access to coupled electronic and lattice dynamics in ultrafast processes.
Funding Agency
This work is supported by the National Natural Science Foundation of China under project No.12235005, No. 12275094. National Key Research and Development Program of China (2024YFB4607900, 2022YFA16022
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