Improved temporal resolution in ultrafast electron diffraction measurements through THz compression and...

Area of Science:

• Physics
• Materials Science
• Physical Chemistry

Background:

• Ultrafast electron diffraction (UED) is a powerful technique for studying dynamic processes in materials.
• Achieving high temporal resolution in UED is crucial for capturing transient phenomena.
• Existing UED methods face limitations in temporal resolution and precision.

Purpose of the Study:

• To experimentally demonstrate a novel UED technique utilizing THz-driven electron bunch compression and time-stamping.
• To enhance the temporal resolution and precision of time-resolved UED measurements.
• To probe ultrafast dynamics in materials with unprecedented detail.

Main Methods:

• Implementing THz-driven longitudinal bunch compression to achieve a compression factor of approximately four.
• Suppressing time-of-arrival jitter between electron bunches and pump laser pulses by a factor of three.
• Utilizing THz-induced transverse spatiotemporal correlations in the electron distribution for enhanced measurement precision.

Main Results:

• Achieved significant electron bunch compression and reduced timing jitter.
• Demonstrated enhanced precision in time-resolved UED measurements.
• Successfully probed single-crystal gold nanofilms, revealing transient THz near-field oscillations.

Conclusions:

• The developed THz-driven UED technique offers superior temporal resolution, down to 50 fs.
• This advancement enables the study of transient phenomena previously inaccessible.
• The method opens new avenues for investigating ultrafast dynamics in various materials.