Layered Bi_(2)O_(2)Se nanosheets,characterized by a low bandgap,high electron mobility,and good air stability,have garnered significant attention for their potential applications in electronics and photonics.However,t...Layered Bi_(2)O_(2)Se nanosheets,characterized by a low bandgap,high electron mobility,and good air stability,have garnered significant attention for their potential applications in electronics and photonics.However,the relatively low photocurrent generated by single Bi_(2)O_(2)Se nanosheet photodetectors results in diminished switching ratios and responsiveness,thereby limiting the overall performance of Bi_(2)O_(2)Se-based photodetectors.In this study,we report a dual-band heterostructure photodetector constructed from high-quality Bi_(2)O_(2)Se nanosheets and CdS nanobelts.This device demonstrates exceptional photodetection performance in both the visible(450 nm)and near-infrared(1150 nm)regions,featuring a high switching ratio,increased responsivity,elevated specific detectivity,large external quantum efficiency,and rapid response speed.Notably,these key parameters exceed those reported in most Bi_(2)O_(2)Se-based photodetectors.Importantly,the Bi_(2)O_(2)Se/CdS heterostructure photodetector showcases impressive high-resolution imaging capabilities.These findings highlight the promising potential of this device for applications in image sensing and encrypted optical communication.展开更多
Information security plays an important role in every aspect of life to protect data from stealing and deciphering.However,most of the previously reported works were based on pure algorithm layer or pure physical laye...Information security plays an important role in every aspect of life to protect data from stealing and deciphering.However,most of the previously reported works were based on pure algorithm layer or pure physical layer encryptions,which have certain limitations in security.In this paper,a nondeterministic message encryption communication scheme is proposed based on a spin-space-frequency multiplexing metasurface(SSFMM),which integrates both algorithmic and physical layer encryptions,and can also produce multiple different ciphertexts for the same message to prevent the message from being cracked through frequency analysis,thus greatly enhancing the security of the information.To be specific,an SSFMM is first designed as a physical-layer meta-key,which can generate eight independent dot matrix holograms with different spin,space,and frequency characteristics.The target message is then encrypted based on these dot matrix holograms combined with algorithmic operations,and the encrypted message is converted into a quick response(QR)code for easy sending to the target users.Once the target user gets that QR code,he/she can scan it to obtain the encryption information,and then recover the target message according to the pre-agreed encryption protocol combined with the eight dot matrix holograms of SSFMM.Finally,the feasibility of the proposed encryption scheme was experimentally validated at the microwave frequency band.展开更多
Information security is a critical requirement across military affairs,business,and daily life.Compared to traditional encryption methods,non-volatile memory offers significant advantages for data encryption due to it...Information security is a critical requirement across military affairs,business,and daily life.Compared to traditional encryption methods,non-volatile memory offers significant advantages for data encryption due to its high-density storage,reli-ability,rewrite capability,fast data transport,robust handleability,and ease of integration into electrical circuits.This review comprehensively summarizes the latest advancements in functional materials design and fabrication for data storage and encryption.It highlights innovative techniques that leverage the stimulus including optical,electrical,magnetic,and humid-ity properties,covering both single-stimulus and multi-stimulus synergistic effect.This review also systematically explores notable progress in the field of encryption.Future research directions will focus on developing ultra-low power devices for data encryption,implementing multiple coordinated encryption techniques,and efficiently integrating advanced devices with algorithms to meet evolving security demands.By offering insights into future trends and challenges,this review aims to deepen understanding and inspire innovative perspectives for the ongoing development of advanced encryption devices.展开更多
The highly ordered film assembled by regularly 1D nanostructures has potentialprospects in electronic,photoelectronic and other fields because of its excellentlight-trapping effect and electronic transport property.Ho...The highly ordered film assembled by regularly 1D nanostructures has potentialprospects in electronic,photoelectronic and other fields because of its excellentlight-trapping effect and electronic transport property.However,the controlledgrowth of highly ordered film remains a great challenge.Herein,large-area andhighly ordered Bi_(2)S_(3) film is synthesized on fluorophlogopite mica substrate bychemical vapor deposition method.The Bi2S3 film features hollowed-outcrosslinked network structure,assembled by 1D nanobelts that regularly distributein three orientations,which agrees well with the first principles calculations.Based on the as-grown Bi_(2)S_(3) film,the broadband photodetector with a responserange from 365 to 940 nm is fabricated,exhibiting a maximum responsivity upto 98.51 mA W^(–1),specific detectivity of 2.03×10^(10)Jones and fast response timeof 35.19 ms.The stable instantaneous on/off behavior for 500 cycles and reliablephotoresponse characteristics of the Bi_(2)S_(3) photodetector after storage in air for6 months confirm its excellent long-term stability and air stability.Significantly,as sensing pixel and signal receiving terminal,the device successfully achieveshigh-resolution imaging of characters of“H”,“I”and“T”,and secure transmissionof confidential information.This work shows a great potential of the largeareaand highly ordered Bi_(2)S_(3) film toward the development of future multiplefunctional photoelectronic applications.展开更多
基金supported by the National Natural Science Foundation of China(Nos.62464014,12464025,12264056,and 12264057)the Basic Research Program of Yunnan Province(No.202401AT070134)+2 种基金Project for Building a Science and Technology Innovation Center Facing South Asia and Southeast Asia(No.202403AP140015)Spring City Plan:The High-level Talent Promotion and Training Project of Kunming(No.2022SCP005)Yunnan Expert Workstation(No.202205AF150008).
文摘Layered Bi_(2)O_(2)Se nanosheets,characterized by a low bandgap,high electron mobility,and good air stability,have garnered significant attention for their potential applications in electronics and photonics.However,the relatively low photocurrent generated by single Bi_(2)O_(2)Se nanosheet photodetectors results in diminished switching ratios and responsiveness,thereby limiting the overall performance of Bi_(2)O_(2)Se-based photodetectors.In this study,we report a dual-band heterostructure photodetector constructed from high-quality Bi_(2)O_(2)Se nanosheets and CdS nanobelts.This device demonstrates exceptional photodetection performance in both the visible(450 nm)and near-infrared(1150 nm)regions,featuring a high switching ratio,increased responsivity,elevated specific detectivity,large external quantum efficiency,and rapid response speed.Notably,these key parameters exceed those reported in most Bi_(2)O_(2)Se-based photodetectors.Importantly,the Bi_(2)O_(2)Se/CdS heterostructure photodetector showcases impressive high-resolution imaging capabilities.These findings highlight the promising potential of this device for applications in image sensing and encrypted optical communication.
基金supported by the National Natural Science Foundation of China(62071117 and 62288101)the Project for Jiangsu Specially-Appointed Professor,the Major Project of the Natural Science Foundation of Jiangsu Province(BK20212002)+1 种基金the 111 Project(111-2-05)the Fundamental Research Funds for the Central Universities(2242023K5002).
文摘Information security plays an important role in every aspect of life to protect data from stealing and deciphering.However,most of the previously reported works were based on pure algorithm layer or pure physical layer encryptions,which have certain limitations in security.In this paper,a nondeterministic message encryption communication scheme is proposed based on a spin-space-frequency multiplexing metasurface(SSFMM),which integrates both algorithmic and physical layer encryptions,and can also produce multiple different ciphertexts for the same message to prevent the message from being cracked through frequency analysis,thus greatly enhancing the security of the information.To be specific,an SSFMM is first designed as a physical-layer meta-key,which can generate eight independent dot matrix holograms with different spin,space,and frequency characteristics.The target message is then encrypted based on these dot matrix holograms combined with algorithmic operations,and the encrypted message is converted into a quick response(QR)code for easy sending to the target users.Once the target user gets that QR code,he/she can scan it to obtain the encryption information,and then recover the target message according to the pre-agreed encryption protocol combined with the eight dot matrix holograms of SSFMM.Finally,the feasibility of the proposed encryption scheme was experimentally validated at the microwave frequency band.
基金supported by the National Natural Science Foundation of China(22275193,52303355)the Natural Science Foundation of Fujian Province(2021J06034)+2 种基金Fujian Provincial Department of Science and Technology(2023I0030)Self-deployment Project Research Program of Haixi Institutes,Chinese Academy of Science(CXZX-2022-GH09)Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences(E055AJ01,E355AJ01).
文摘Information security is a critical requirement across military affairs,business,and daily life.Compared to traditional encryption methods,non-volatile memory offers significant advantages for data encryption due to its high-density storage,reli-ability,rewrite capability,fast data transport,robust handleability,and ease of integration into electrical circuits.This review comprehensively summarizes the latest advancements in functional materials design and fabrication for data storage and encryption.It highlights innovative techniques that leverage the stimulus including optical,electrical,magnetic,and humid-ity properties,covering both single-stimulus and multi-stimulus synergistic effect.This review also systematically explores notable progress in the field of encryption.Future research directions will focus on developing ultra-low power devices for data encryption,implementing multiple coordinated encryption techniques,and efficiently integrating advanced devices with algorithms to meet evolving security demands.By offering insights into future trends and challenges,this review aims to deepen understanding and inspire innovative perspectives for the ongoing development of advanced encryption devices.
基金National Key Research and Development Program of China,Grant/Award Number:2019YFA0705201National Natural Science Foundation of China,Grant/Award Number:12074095+1 种基金Natural Science Foundation of Heilongjiang Province of China,Grant/Award Number:LH2020E033Heilongjiang Touyan Team。
文摘The highly ordered film assembled by regularly 1D nanostructures has potentialprospects in electronic,photoelectronic and other fields because of its excellentlight-trapping effect and electronic transport property.However,the controlledgrowth of highly ordered film remains a great challenge.Herein,large-area andhighly ordered Bi_(2)S_(3) film is synthesized on fluorophlogopite mica substrate bychemical vapor deposition method.The Bi2S3 film features hollowed-outcrosslinked network structure,assembled by 1D nanobelts that regularly distributein three orientations,which agrees well with the first principles calculations.Based on the as-grown Bi_(2)S_(3) film,the broadband photodetector with a responserange from 365 to 940 nm is fabricated,exhibiting a maximum responsivity upto 98.51 mA W^(–1),specific detectivity of 2.03×10^(10)Jones and fast response timeof 35.19 ms.The stable instantaneous on/off behavior for 500 cycles and reliablephotoresponse characteristics of the Bi_(2)S_(3) photodetector after storage in air for6 months confirm its excellent long-term stability and air stability.Significantly,as sensing pixel and signal receiving terminal,the device successfully achieveshigh-resolution imaging of characters of“H”,“I”and“T”,and secure transmissionof confidential information.This work shows a great potential of the largeareaand highly ordered Bi_(2)S_(3) film toward the development of future multiplefunctional photoelectronic applications.
