Manipulating perovskite structural asymmetry for high-performing self-powered full-stokes polarimetry

Area of Science:

• Materials Science
• Optoelectronics
• Photonics

Background:

• Direct full-Stokes imaging polarimetry is crucial but technically challenging.
• Perovskites offer excellent optoelectronic properties but have limited circular-polarization discrimination due to low chiroptical activity.

Purpose of the Study:

• To enhance the chiroptical activity of perovskites for improved direct full-Stokes polarimetry.
• To investigate the relationship between structural chiral distortion and chiroptical activity in perovskites.

Main Methods:

• Utilized halide mixing in perovskites to engineer asymmetric chiral transfer and increase structural chiral distortion.
• Performed ab initio calculations to understand the underlying physical mechanisms.
• Developed a self-powered direct full-Stokes polarimetry system.

Main Results:

• Achieved a 16-fold increase in optical chiroptical activity through halide mixing.
• Demonstrated a self-powered polarimetry system with high detectivity (1.2 × 10^12 Jones) and low errors (ΔS1-3 ≤ 5.0%).
• Verified that enhanced activity stems from strengthened magnetic transition dipoles in mixed-halide structures.

Conclusions:

• Structural chiral distortion is key to perovskite chiroptical activity.
• Halide mixing is an effective strategy to enhance chiroptical activity for polarimetry applications.
• The developed perovskite-based polarimetry system offers state-of-the-art performance for full-Stokes imaging.