Abstract
This work envisions the powerful roles of the proposed design methodology. The experimental results affirm that the designed polarization-sensitive metalenses effectively eliminate the chromatic aberration while exhibiting polarization selectivity and negligible crosstalk. Compared with the single-polarization optimization method, the average crosstalk has been reduced by more than three times for incident light with arbitrary polarization in a wavelength range from 9 μm to 12 μm, guaranteeing a more accurate measurement of the polarization state. This work could impact applications in wavefront detection, remote sensing, color imaging, and light-field imaging.
In a recent paper published on Opto-Electronic Advances
Polarization comprises abundant information of substance, playing an essential role in light-matter interactions. Polarimetry, a method of determining the polarization states of the scene, has been widely adopted in remote sensing
Albeit some works attempted to extend the bandwidth of the polarimeter by using metagrating
Figure 1.
Metasurface has made numerous impressive applications in imaging
To execute the proposed methodology, a crosstalk-free broadband achromatic full Stokes imaging polarimeter based on dielectric metasurface is produced, which operates in wavelength range from 9 µm to 12 µm with a relative bandwidth of 0.2857. The polarimeter consists of 2×3 polarization-sensitive dielectric metalenses, elaborately designed by the particle swarm optimization (PSO) algorithm and polarization-dependent phase optimization method. The performances of the achromatic metalenses for linear (X, Y) and circular (L, R) polarizations are first verified. Both numerical simulations and experimental results demonstrate that these metalenses accomplish crosstalk-free polarization-sensitive achromatic focusing within the designated bandwidth. Moreover, the performance of the polarimeter is validated by illuminating various polarization states under 9.3 μm, 9.6 μm, 10.3 μm, and 10.6 μm wavelength. The polarimeter can directly and accurately measure without calibration at each wavelength, which is of great significance to the practicality of the device, because various influencing factors are considered in the early elaborate design. Finally, the polarization imaging performance is evidenced by utilizing a self-built polarization mask that carries polarization information.
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