Yuan Mingjian of Nankai University, AM: Uniaxially Aligned Chiral Perovskites for Flexible All-Stokes Polarimeters

Full-Stokes polarization detection boasts high integration and portability, offering an effective pathway for next-generation multi-information optoelectronic systems. However, current filter-based approaches result in rigid and bulky configurations, thereby limiting practical applicability. In light of this, on May 11, 2024, Yuan Ming from Nankai University published in Advanced Materials a study demonstrating the use of uniaxially aligned chiral perovskite films in a flexible, filter-free full-Stokes polarimeter. This paper reports, for the first time, such a device. The study reveals that strategic manipulation of the surfactant-mediated Marangoni effect during blade-coating is crucial for guiding balanced mass transport and achieving oriented crystallization. By employing this approach, the resulting uniaxially aligned chiral perovskite film inherently exhibits anisotropy and chirality, conferring the requisite sensitivity to both linearly and circularly polarized light vectors. Moreover, the uniaxial crystal structure enhances photoelectric detection, yielding a specific detectivity of 5.23 × 10^13 Jones—ten times higher than that of non-aligned devices. The fabricated flexible polarimeter can accurately capture full-Stokes polarization without optical filters, with minimal errors in Stokes parameter measurement: ΔS1 = 9.2%, ΔS2 = 8.6%, and ΔS3 = 6.5%, approaching the detection accuracy of filter-based polarimeters. This proof-of-concept also demonstrates potential applications in matrix polarization imaging.