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Capturing Structural Dynamics in Crystalline Silicon Using Chirped Electrons from a Laser Wakefield Accelerator.

Z-H He¹, B Beaurepaire², J A Nees¹

¹Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109-2099 USA.

Scientific Reports

|November 9, 2016

Summary

Novel laser-driven electron sources enable time-resolved electron diffraction, capturing ultrafast structural dynamics in silicon nano-membranes. This technique offers atomic-scale insights into material changes on picosecond timescales.

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Area of Science:

Ultrafast Science
Materials Science
Particle Accelerators

Background:

Laser wakefield acceleration produces novel electron and X-ray sources.
These sources are valuable for studying ultrafast phenomena with atomic resolution.

Purpose of the Study:

Demonstrate laser-wakefield-accelerated electron bunches for time-resolved electron diffraction.
Investigate structural dynamics of single-crystal silicon nano-membranes pumped by ultrafast lasers.

Main Methods:

Utilized laser-wakefield-accelerated electron bunches.
Performed time-resolved electron diffraction on silicon nano-membranes.
Employed a static magnetic field to deflect electrons for time-dependent diffraction efficiency measurement.

Main Results:

Resolved silicon lattice dynamics on a picosecond timescale.
Successfully demonstrated proof-of-concept for this novel pump-probe technique.

Conclusions:

Laser-wakefield-accelerated electrons are effective for time-resolved electron diffraction.
Future advancements could achieve femtosecond resolution with minimal jitter for ultrafast electron diffraction schemes.