Large-area and high-spatial-resolution photodetectors with the ability of light direction recognition have promising application prospects in smart sensors, human-machine interaction, the Internet of Things, and other fields. However, current photodetectors often fail to achieve accurate direction recognition of light and require a trade-off between high spatial resolution and device size. Here, we show a printed microscale perovskite dual-line structure designed for resonant, directionally selective absorption, which creates differentiated photocurrents under visible light from different directions. After investigating the change of reflected light from the eyeball, a single dual-line microstructure can be integrated as a wearable photodetector for monitoring eye movement abnormalities. The frequency and amplitude of eye movement can be recorded for early warning of neurological disorders and monitoring nervous system diseases. This strategy provides a new approach for creating high-performance optoelectronic devices using printed photonic resonant structures, which extends the application of optoelectronic devices in brain science.
Chen et al. (Wed,) studied this question.