Developing multifunctional devices capable of on-demand task switching is crucial for highly integrated intelligent systems.We introduce a multifunctional ultraviolet(UV)photodetector(PD)based on an AlScN/GaN heteroju...Developing multifunctional devices capable of on-demand task switching is crucial for highly integrated intelligent systems.We introduce a multifunctional ultraviolet(UV)photodetector(PD)based on an AlScN/GaN heterojunction,featuring dynamically reconfigurable operating modes via bias voltages.At low bias voltages,it functions as a fast and highly sensitive UV PD(the specific detectivity reaching 9.37×10^(12) Jones),applied in high-speed imaging and optical communication.Interestingly,at higher bias voltages,the device exhibits a persistent photoconductivity effect.This behavior enables the effective emulation of biological synaptic plasticity,including key functions such as excitatory postsynaptic current,paired-pulse facilitation,and the transition from short-term memory to long-term memory.Leveraging this unique biascontrolled characteristic,we introduce a hardware-intrinsic encrypted optical imaging scheme by ingeniously combining the device’s distinct fast and slow photoresponse dynamics.Secure image access is achieved by employing a combination of synchronized optical inputs and dynamic biasing protocols as security keys.We demonstrate a single AlScN/GaN optoelectronic device platform for achieving reconfigurable multifunctionality and hardware-level encrypted imaging,holding significant potential for neuromorphic computing and highly secure information systems.展开更多
基金funded by the National Natural Science Foundation of China(Grant Nos.62374075,62274017,62174016,and 62074019)the Fundamental Research Funds for Central Universities of Jiangnan University(Grant Nos.JUSRP202504018 and JUSRP202501142)the Research and Practice Projects on Postgraduate Education and Teaching Reform of Jiangnan University(Grant No.YJSJGZD24_006).
文摘Developing multifunctional devices capable of on-demand task switching is crucial for highly integrated intelligent systems.We introduce a multifunctional ultraviolet(UV)photodetector(PD)based on an AlScN/GaN heterojunction,featuring dynamically reconfigurable operating modes via bias voltages.At low bias voltages,it functions as a fast and highly sensitive UV PD(the specific detectivity reaching 9.37×10^(12) Jones),applied in high-speed imaging and optical communication.Interestingly,at higher bias voltages,the device exhibits a persistent photoconductivity effect.This behavior enables the effective emulation of biological synaptic plasticity,including key functions such as excitatory postsynaptic current,paired-pulse facilitation,and the transition from short-term memory to long-term memory.Leveraging this unique biascontrolled characteristic,we introduce a hardware-intrinsic encrypted optical imaging scheme by ingeniously combining the device’s distinct fast and slow photoresponse dynamics.Secure image access is achieved by employing a combination of synchronized optical inputs and dynamic biasing protocols as security keys.We demonstrate a single AlScN/GaN optoelectronic device platform for achieving reconfigurable multifunctionality and hardware-level encrypted imaging,holding significant potential for neuromorphic computing and highly secure information systems.
