Crosstalk model of division of focal plane polarization cameras: optical causes and parameter effects

Area of Science:

• Optics and Photonics
• Image Sensors
• Polarization Imaging

Background:

• Division of focal plane polarization cameras are essential integrated polarization imaging systems.
• Light intensity crosstalk between micro-polarizer pixels causes significant measurement errors in these systems.
• Previous research has qualitatively assessed crosstalk trends but lacked quantitative models.

Purpose of the Study:

• To develop a quantitative model for light intensity crosstalk in division of focal plane polarization cameras.
• To investigate the influence of F-number and incident angle on crosstalk.
• To validate the model through macroscopic experiments and confirm crosstalk calibration feasibility.

Main Methods:

• Modeling crosstalk as near-field, non-paraxial diffraction from an ideal metal grating.
• Employing the angular spectrum method with spatial-domain discrete sampling.
• Analyzing coherence effects and proposing a cosine-based intensity response.

Main Results:

• Established the relationship between F-number, incident angle, and crosstalk intensity distribution.
• Identified polarization parameter deviations and system noise due to crosstalk.
• Validated the microscopic model with macroscopic experimental data.

Conclusions:

• The developed model accurately predicts crosstalk in polarization cameras.
• Crosstalk significantly impacts polarization parameter measurements and introduces system noise.
• The study confirms the feasibility of crosstalk calibration for enhanced polarization imaging accuracy.