Molecular-Orientation Engineering Photonic Spin Textures Rotation in Organic Crystal Microcavities

Area of Science:

• Quantum optics
• Condensed matter physics
• Materials science

Background:

• Exciton polaritons are bosonic quasiparticles with both photon and exciton properties.
• Optical spin-orbit coupling (SOC) is crucial for novel physical effects but lacks intuitive explanations regarding spin textures.
• Understanding exciton polariton-photon interactions is key to controlling spin textures.

Purpose of the Study:

• To demonstrate and explain the spin texture rotation of optical SOC.
• To investigate the role of molecular orientation in organic crystal-filled microcavities.
• To establish mechanisms for manipulating spin textures for device applications.

Main Methods:

• Fabrication of organic crystal-filled microcavities.
• Investigation of exciton-photon interactions under weak and strong coupling regimes.
• Analysis of spin textures using circularly polarized light.

Main Results:

• Observed antisymmetric spatial distribution of spin textures at k_y = 0 in weak coupling systems.
• Demonstrated 45° spin texture rotation in strong coupling systems due to effective magnetic field rotation.
• Showcased effective manipulation of spin texture rotation via exciton polaritons.

Conclusions:

• Exciton polaritons provide a platform for understanding and controlling optical SOC spin textures.
• The findings offer fundamental insights into spin-photon interactions.
• This work lays the groundwork for on-chip spin photon devices, spin filtering, and quantum information manipulation.