Perovskite metasurfaces for high-performance chiral photodetection

On-chip integrated chirality-sensitive photodetectors play a vital role in next-generation imaging, sensing, and navigation. Traditional approaches are either relatively inefficient or must be used in conjunction with separate photodetectors, strongly restricting their device performance. Here, we propose and experimentally demonstrate a new type of high-performance chiral photodetector by directly patterning a metasurface into a perovskite film. We reveal that local transformations of the perovskite metasurface within each unit cell precisely tune the out-of-plane asymmetry of the electromagnetic field, thereby producing high- Q chiral resonances with near-maximal circular dichroism (CD). The corresponding perovskite photodetector therefore responds almost exclusively to one circular polarization at the resonant wavelength. Experimentally, the chiral photodetector was realized by etching a (p-F- PEA ) 2 MA 3 Pb 4 I 13 perovskite film between two Au electrodes. The perovskite metasurface significantly enhanced chiral selectivity while preserving monolithic integration, enabling chiral photodetection with a record-breaking photocurrent dissymmetry factor ( g ph ).