Liquid lens offers a novel approach to achieving large depth of field,wide viewing angle,high speed,and high-quality imaging in zoom optical systems.However,the aperture and reliability limit the lens’s performance i...Liquid lens offers a novel approach to achieving large depth of field,wide viewing angle,high speed,and high-quality imaging in zoom optical systems.However,the aperture and reliability limit the lens’s performance in various optical applications.The liquid material is crucial for the reliability of the large-aperture liquid lens.To solve the dielectric failure problem associated with the large aperture,we first reveal the mechanism of dielectric failure based on the transport properties of electrolyte solutions and the impact of electrochemical reaction rates from physical chemistry so as to propose a theoretical method to suppress dielectric failure fundamentally.Based on this theory,we develop a series of non-aqueous organic solutions to suppress high-voltage dielectric failure.Next,we identify the optimal formulation for comprehensive optical performance and fabricate a centimeter-level large-aperture electrowetting liquid lens.This lens features an optical power variation range of−11.98m^(−1) to 12.93m^(−1),with clear and high-quality imaging function,which can enlarge the field of view and depth adjustment range of holographic reconstructions while maintaining excellent edge clarity of the reconstructed images.The proposed centimeter-level large-aperture non-aqueous electrowetting liquid lens effectively suppresses dielectric failure under high voltage,demonstrates excellent optical performance,and holds exciting potential for applications in 3D display,precision measurement,biomedical observation,and more.展开更多
Photonic synapses combining photosensitivity and synaptic function can efficiently perceive and memorize visual information,making them crucial for the development of artificial vision systems.However,the development ...Photonic synapses combining photosensitivity and synaptic function can efficiently perceive and memorize visual information,making them crucial for the development of artificial vision systems.However,the development of high-performance photonic synapses with low power consumption and rapid optical erasing ability remains challenging.Here,we propose a photon-modulated charging/discharging mechanism for self-powered photonic synapses.The current hysteresis enables the devices based on CsPbBr3/solvent/carbon nitride multilayer architecture to emulate synaptic behaviors,such as excitatory postsynaptic currents,paired-pulse facilitation,and long/short-term memory.Intriguingly,the unique radiation direction-dependent photocurrent endows the photonic synapses with the capability of optical writing and rapid optical erasing.Moreover,the photonic synapses exhibit exceptional performance in contrast enhancement and noise reduction owing to the notable synaptic plasticity.In simulations based on artificial neural network(ANN)algorithms,the pre-processing by our photonic synapses improves the recognition rate of handwritten digit from 11.4%(200 training epochs)to 85%(~60 training epochs).Furthermore,due to the excellent feature extraction and memory capability,an array based on the photonic synapses can imitate facial recognition of human retina without the assistance of ANN.展开更多
基金supported by the National Natural Science Foundation of China under Grant No.U23A20368,62175006,and 62275009.
文摘Liquid lens offers a novel approach to achieving large depth of field,wide viewing angle,high speed,and high-quality imaging in zoom optical systems.However,the aperture and reliability limit the lens’s performance in various optical applications.The liquid material is crucial for the reliability of the large-aperture liquid lens.To solve the dielectric failure problem associated with the large aperture,we first reveal the mechanism of dielectric failure based on the transport properties of electrolyte solutions and the impact of electrochemical reaction rates from physical chemistry so as to propose a theoretical method to suppress dielectric failure fundamentally.Based on this theory,we develop a series of non-aqueous organic solutions to suppress high-voltage dielectric failure.Next,we identify the optimal formulation for comprehensive optical performance and fabricate a centimeter-level large-aperture electrowetting liquid lens.This lens features an optical power variation range of−11.98m^(−1) to 12.93m^(−1),with clear and high-quality imaging function,which can enlarge the field of view and depth adjustment range of holographic reconstructions while maintaining excellent edge clarity of the reconstructed images.The proposed centimeter-level large-aperture non-aqueous electrowetting liquid lens effectively suppresses dielectric failure under high voltage,demonstrates excellent optical performance,and holds exciting potential for applications in 3D display,precision measurement,biomedical observation,and more.
基金supported by the Natural Science Foundation of Shandong Province(ZR2021YQ32)the China Postdoctoral Science Foundation(2023M740472)+2 种基金the National Natural Science Foundation of China(62175162,62205214,and 61901222)the Taishan Scholars Program of Shandong Province(tsqn201909117)the Special Fund for Science and Technology Innovation Teams of Shanxi Province and Foundation of Shenzhen Science and Technology(20200814100534001).
文摘Photonic synapses combining photosensitivity and synaptic function can efficiently perceive and memorize visual information,making them crucial for the development of artificial vision systems.However,the development of high-performance photonic synapses with low power consumption and rapid optical erasing ability remains challenging.Here,we propose a photon-modulated charging/discharging mechanism for self-powered photonic synapses.The current hysteresis enables the devices based on CsPbBr3/solvent/carbon nitride multilayer architecture to emulate synaptic behaviors,such as excitatory postsynaptic currents,paired-pulse facilitation,and long/short-term memory.Intriguingly,the unique radiation direction-dependent photocurrent endows the photonic synapses with the capability of optical writing and rapid optical erasing.Moreover,the photonic synapses exhibit exceptional performance in contrast enhancement and noise reduction owing to the notable synaptic plasticity.In simulations based on artificial neural network(ANN)algorithms,the pre-processing by our photonic synapses improves the recognition rate of handwritten digit from 11.4%(200 training epochs)to 85%(~60 training epochs).Furthermore,due to the excellent feature extraction and memory capability,an array based on the photonic synapses can imitate facial recognition of human retina without the assistance of ANN.
