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Reflection of vortex beam from relativistic flying mirror
Weixin Chen1, Xiaomei Zhang2, Dirui Xu1
1Department of Physics, Shanghai Normal University, Shanghai, 200234, China.
Scientific Reports
|July 22, 2022
Summary
This study investigated angular momentum changes in vortex beams reflected by relativistic flying mirrors. Results show spin and linear momentum remain collinear, while orbital angular momentum deviates due to the Doppler effect.
Area of Science:
- Physics
- Optics
- Plasma Physics
Background:
- Vortex beams carry orbital and spin angular momentum.
- Relativistic flying mirrors can significantly alter light properties.
- Understanding momentum transfer in extreme conditions is crucial.
Purpose of the Study:
- To investigate the change in angular momentum of a vortex beam after reflection from a relativistic flying mirror.
- To analyze the collinearity of spin, orbital, and linear momentum in the reflected beam.
- To determine the influence of the Doppler effect on momentum distribution.
Main Methods:
- Full three-dimensional particle-in-cell simulations were employed.
- The simulations modeled the interaction of a vortex beam with a relativistic mirror.
- Analysis focused on the momentum components of the reflected beam.
Main Results:
- The spin angular momentum of the reflected beam is collinear with its linear momentum.
- The orbital angular momentum of the reflected beam is not collinear with its linear momentum.
- The Doppler effect was identified as the cause for the orbital angular momentum's non-collinearity.
Conclusions:
- Reflection from a relativistic flying mirror alters the angular momentum of vortex beams.
- Spin and linear momentum remain aligned, but orbital momentum deviates.
- The findings highlight the complex interplay between relativistic effects, Doppler shifts, and light momentum.
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