Metasurface-based broadband full Stokes polarimeter with optimized simulation design
Abstract
A polarimeter, fundamental for characterizing the polarization state of light, is critical for advancing optical measurement techniques by delivering precise polarization information. A compact and portable polarimeter holds particular importance in applications like remote sensing and medical diagnosis. However, existing methods for developing a compact polarimeter are difficult to achieve full Stokes vector detection for broadband operation, and the noise immunity is also very weak. These defects significantly constrain the versatility of polarimeters across diverse application scenarios. Herein, a metadevice with dual-layer subwavelength grating structure for full Stokes vector detection has been proposed, capable of simultaneously achieving broadband detection and noise suppression. The intensity of the four elliptical polarization states of the incident light can be captured by four regions on this metadevice, enabling the computation of the full polarization state information via Mueller matrix inversion. Additionally, a set of optimized retardance at 0.73 pi and orientation angles at 43 degrees, 80 degrees, 111 degrees, and 146 degrees is provided to effectively suppress the noise. The results indicate that the recovery error remains below 5% across the 450-650 nm spectral range, showcasing a 1.5-fold enhancement in noise suppression capability compared to conventional structures.
