On-Chip Laser-Driven Free-Electron Spin Polarizer

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Spin-polarized electrons are crucial for investigating nanoscale spin-dependent phenomena.
• Current methods for generating spin-polarized electrons can be complex and lack integration.

Purpose of the Study:

• To propose and describe a novel method for generating spin-polarized electrons on an integrated photonics chip.
• To enable compact and efficient generation of spin-polarized electrons for nanoscale research.

Main Methods:

• Utilizing laser-driven nanophotonic fields on an integrated photonics chip.
• Employing a two-stage interaction process with a free-space drift length.
• Manipulating electron wave function spin-dependent characteristics and spin states using optical near fields.

Main Results:

• The proposed method introduces spin-dependent characteristics into the electron wave function's probability distribution.
• The second stage effectively rotates spin states to produce electrons with high ensemble average spin expectation values.
• Demonstrated potential for millimeter-scale chip implementation with tabletop lasers.

Conclusions:

• This integrated photonics platform offers a compact and efficient solution for generating spin-polarized electrons.
• The technology facilitates advanced studies of spin-dependent electric and magnetic effects at the nanoscale.
• Paves the way for miniaturized spin-polarized electron sources for diverse scientific applications.