Simple Stokes polarimeter using a liquid crystal grating with ternary orientation domains

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Polarization measurement is crucial for optical applications.
• Traditional polarimeters can be complex and bulky.
• Liquid crystal (LC) gratings offer tunable optical properties.

Purpose of the Study:

• To propose and demonstrate a novel liquid crystal grating for optical polarization measurements.
• To investigate the use of a ternary orientation domain for simultaneous polarization parameter acquisition.
• To evaluate the performance of the LC grating as a Stokes polarimeter.

Main Methods:

• Fabrication of a liquid crystal grating with a ternary orientation domain.
• Experimental investigation of LC molecular orientation and diffraction efficiency.
• Characterization of the LC grating as a Stokes polarimeter for determining Stokes parameters (S0, S1, S2, S3).

Main Results:

• The proposed LC grating exhibits two-dimensional diffraction properties.
• Simultaneous acquisition of multiple polarization parameters was achieved.
• The feasibility of the LC grating as a Stokes polarimeter was experimentally demonstrated for linearly and circularly polarized light.

Conclusions:

• The developed liquid crystal grating is a viable component for Stokes polarimetry.
• The ternary orientation domain is key to simultaneous polarization measurement.
• The study validates the practical application of LC gratings in optical polarization analysis.