Optical synapses have an ability to perceive and remember visual information, making them expected to provide more intelligent and efficient visual solutions for humans. As a new type of artificial visual sensory devices, photoelectric memristors can fully simulate synaptic performance and have great prospects in the development of biological vision. However, due to the urgent problems of nonlinear conductance and high-energy consumption, its further application in high-precision control scenarios and integration is hindered. In this work, we report an optoelectronic memristor with a structure of TiN/CeO₂/ZnO/ITO/Mica, which can achieve minimal energy consumption (187 pJ) at a single pulse (0.5 V, 5 ms). Under the stimulation of continuous pulses, linearity can be achieved up to 99.6%. In addition, the device has a variety of synaptic functions under the combined action of photoelectric, which can be used for advanced vision. By utilizing its typical long-term memory characteristics, we achieved image recognition and long-term memory in a 3 × 3 synaptic array and further achieved female facial feature extraction behavior with an activation rate of over 92%. Moreover, we also use the linear response characteristic of the device to design and implement the night meeting behavior of autonomous vehicles based on the hardware platform. This work highlights the potential of photoelectric memristors for advancing neuromorphic vision systems, offering a new direction for bionic eyes and visual automation technology.

The University of Pennsylvania's Bo Zhen and postdoctoral researcher Li He developed a system for guiding light through tiny crystals in ways that allow it to navigate undeterred by bumps and defects. Their work could lead to sturdier lasers, faster data links, and light-based chips that don’t get tripped up by imperfections.

NASA’s Perseverance Rover spent three years exploring the floor of Jezero Crater, located just north of the Martian equator. This close-up look at what had previously been seen only from orbit revealed evidence of chemical reactions that shaped the planet billions of years ago. SETI Institute Senior Research Scientist Janice Bishop and University of Massachusetts Engineering Professor Mario Parente analyzed orbital hyperspectral images from the Compact Imaging Spectrometer for Mars (CRISM) aboard the Mars Reconnaissance Orbiter, producing a detailed mineral map at the tens of meters scale of the crater documenting deposits of clays and carbonates signaling abundant water on ancient Mars. In a new Nature News & Views article, Bishop and Parente explore how these findings, combined with Perseverance’s confirmation of the minerals observed from orbit and discoveries of unusual minerals not detectable from orbit, suggest chemical reactions involving minerals, water, and possibly organic material could have created energy-rich environments on early Mars.

“Coordinating mineral detections from orbit at Mars with in situ detections by the Perseverance rover gives us a detailed look at ancient chemical reactions for a few small areas and a broader view across kilometers of the surface,” said Bishop.