Optical spin Hall effect driven by hybrid spin-orbit coupling in organic microcavities

Area of Science:

• Photonics and Spintronics
• Topological Photonics
• Organic Electronics

Background:

• The optical spin Hall effect (OSHE) enables spin-dependent light manipulation, crucial for on-chip photonic technologies.
• Previous OSHE studies demonstrated distinct topological textures separately, but achieving multiple textures in one system was a challenge.

Purpose of the Study:

• To report the first observation of OSHE driven by the interplay between transverse electric-transverse magnetic (TE-TM) splitting and Rashba-Dresselhaus spin-orbit coupling (RDSOC).
• To investigate hybrid spin textures and their properties in an organic microcavity system at room temperature.

Main Methods:

• Utilized an organic microcavity system at room temperature.
• Employed polarization-resolved measurements to analyze the resulting spin textures.
• Investigated the interplay between TE-TM splitting and RDSOC.

Main Results:

• Observed hybrid spin textures: quadrupole patterns at high momenta (from TE-TM splitting) and mirror-symmetric textures at low momenta (from RDSOC).
• Demonstrated a persistent spin bias with a polarization lifetime of approximately 300 ps.
• Confirmed robust spin coherence for device applications.

Conclusions:

• Organic microcavities are versatile platforms for engineering hybrid spin-orbit coupling.
• The findings advance topological photonics and integrated spin-based information processing.
• Established a new method for creating complex spin textures in light manipulation.