Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and etc.Nevertheless,the detection of weak light signals...Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and etc.Nevertheless,the detection of weak light signals is often severely interfered by multiple factors such as background light,dark noise and circuit noise,making it difficult to accurately capture signals.While traditional technologies like silicon photomultiplier tubes excel in sensitivity,their high cost and inherent fragility restrict their widespread application.Against this background,perovskite materials have rapidly emerged as a research focus in the field of photodetection due to their simple preparation processes and exceptional optoelectronic properties.Not only are the preparation processes of perovskite materials straightforward and cost-effective,but more importantly,they can be flexibly integrated into flexible and stretchable substrates.This characteristic significantly compensates for the shortcomings of traditional rigid electronic devices in specific application scenarios,opening up entirely new possibilities for photodetection technology.Herein,recent advances in perovskite light detection technology are reviewed.Firstly,the chemical and physical properties of perovskite materials are discussed,highlighting their remarkable advantages in weak-light detection.Subsequently,the review systematically organizes various preparation techniques of perovskite materials and analyses their advantages in different application scenarios.Meanwhile,from the two core dimensions of performance improvement and light absorption enhancement,the key strategies of improving the performance of perovskite weak-light photodetectors are explored.Finally,the review concludes with a brief summary and a discussion on the potential challenges that may arise in the further development of perovskite devices.展开更多
By using semiclassical theory combined with multiple-scale method, we analytically study the linear absorption and the nonlinear dynamical properties in a lifetime broadened Λ-type three-level self-assembled quantum ...By using semiclassical theory combined with multiple-scale method, we analytically study the linear absorption and the nonlinear dynamical properties in a lifetime broadened Λ-type three-level self-assembled quantum dots. It is found that this system can exhibit the transparency, and the width of the transparency window becomes wider with the increase of control light field. Interestingly, a weak probe light beam can form spatial weak-light dark solitons. When it propagates along the axial direction, the soliton will transform into a steady spatial weak-light ring dark soltion. In addition, the stability of two-dimensional spatial optical solitons is testified numerically.展开更多
A comprehensive simulation was performed to better understand the impacts and effects of the additional technical noises on weak-light phase-locking for LISA. The result showed that the phase of the slave laser tracke...A comprehensive simulation was performed to better understand the impacts and effects of the additional technical noises on weak-light phase-locking for LISA. The result showed that the phase of the slave laser tracked well with the received transmitting light under different noise level, and the locking precision was limited by the phase readout noise when the laser frequency noise and clock jitter noise were removed. This result was then confirmed by a benchtop experimental test. The required LISA noise floor was recovered from the simulation which proved the validity of the simulation program. In order to convert the noise function into real time data with random characteristics, an algorism based on Fourier transform was also invented.展开更多
The plant growth and physiological and biochemical responses of root and leaves of grape Yinhong seedlings to the weak lights of 20 000,16 000,12 000,8 000 lx and the normal illumination of 25 000 lx（CK） respectivel...The plant growth and physiological and biochemical responses of root and leaves of grape Yinhong seedlings to the weak lights of 20 000,16 000,12 000,8 000 lx and the normal illumination of 25 000 lx（CK） respectively,were investigated.There was no significant dfference in growth indexes of root and leaves of grapevine seedlings between the light of 20 000 lx and CK,and the light of 16 000 lx and CK for 30 d.The chlorophyll contents,soluble protein contents,net photosynthetic rates,transpiration rates,stomatal conductance,water use efficiency and protective enzyme（CAT,POD,SOD） activities in the leaves under the lights of 20 000 lx and 16 000 lx for 30 d were all higher than those under the lights of 20 000 lx and 16 000 lx for 1 d.Under the light of 8 000 lx for 30 d,the growth indexes of root and leaves of grapevine seedlings were significantly lower than those of CK,and except for MDA content,most physiological and biochemical indexes of the leaves were significantly lower than those under the light of 8 000 lx for 1 d.Under12 000 lx,the values of most growth indexes in root and leaves and physiological and biochemical indexes in leaves were between the 16 000 lx and 8 000 lx.In conclusion,Yinhong could grow under the lights above 16 000 lx,and would be stunted by the weak light below 8 000 lx.展开更多
文摘Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and etc.Nevertheless,the detection of weak light signals is often severely interfered by multiple factors such as background light,dark noise and circuit noise,making it difficult to accurately capture signals.While traditional technologies like silicon photomultiplier tubes excel in sensitivity,their high cost and inherent fragility restrict their widespread application.Against this background,perovskite materials have rapidly emerged as a research focus in the field of photodetection due to their simple preparation processes and exceptional optoelectronic properties.Not only are the preparation processes of perovskite materials straightforward and cost-effective,but more importantly,they can be flexibly integrated into flexible and stretchable substrates.This characteristic significantly compensates for the shortcomings of traditional rigid electronic devices in specific application scenarios,opening up entirely new possibilities for photodetection technology.Herein,recent advances in perovskite light detection technology are reviewed.Firstly,the chemical and physical properties of perovskite materials are discussed,highlighting their remarkable advantages in weak-light detection.Subsequently,the review systematically organizes various preparation techniques of perovskite materials and analyses their advantages in different application scenarios.Meanwhile,from the two core dimensions of performance improvement and light absorption enhancement,the key strategies of improving the performance of perovskite weak-light photodetectors are explored.Finally,the review concludes with a brief summary and a discussion on the potential challenges that may arise in the further development of perovskite devices.
基金Project supported by the Special Funds of the National Natural Science Foundation of China(Grant No.11247313)
文摘By using semiclassical theory combined with multiple-scale method, we analytically study the linear absorption and the nonlinear dynamical properties in a lifetime broadened Λ-type three-level self-assembled quantum dots. It is found that this system can exhibit the transparency, and the width of the transparency window becomes wider with the increase of control light field. Interestingly, a weak probe light beam can form spatial weak-light dark solitons. When it propagates along the axial direction, the soliton will transform into a steady spatial weak-light ring dark soltion. In addition, the stability of two-dimensional spatial optical solitons is testified numerically.
基金supported by the Space Science Research Projects in Advance(Grant No.O930143XM1)the Scientific Equipment Development and Research Project(Grant No.Y231411YB1) of Chinese Academy of Sciences
文摘A comprehensive simulation was performed to better understand the impacts and effects of the additional technical noises on weak-light phase-locking for LISA. The result showed that the phase of the slave laser tracked well with the received transmitting light under different noise level, and the locking precision was limited by the phase readout noise when the laser frequency noise and clock jitter noise were removed. This result was then confirmed by a benchtop experimental test. The required LISA noise floor was recovered from the simulation which proved the validity of the simulation program. In order to convert the noise function into real time data with random characteristics, an algorism based on Fourier transform was also invented.
基金Supported by Science and Technology Innovation Team Project of Ningbo Province of China(2011B82019)Supported by Natural Science Foundation of Ningbo Province of China(Y13C150014)+1 种基金Supported by Foundation of Zhejiang Educational Committee(2011C32008)Supported by Science and Technology Project of Ningbo Province,China(2010C91049)~~
文摘The plant growth and physiological and biochemical responses of root and leaves of grape Yinhong seedlings to the weak lights of 20 000,16 000,12 000,8 000 lx and the normal illumination of 25 000 lx（CK） respectively,were investigated.There was no significant dfference in growth indexes of root and leaves of grapevine seedlings between the light of 20 000 lx and CK,and the light of 16 000 lx and CK for 30 d.The chlorophyll contents,soluble protein contents,net photosynthetic rates,transpiration rates,stomatal conductance,water use efficiency and protective enzyme（CAT,POD,SOD） activities in the leaves under the lights of 20 000 lx and 16 000 lx for 30 d were all higher than those under the lights of 20 000 lx and 16 000 lx for 1 d.Under the light of 8 000 lx for 30 d,the growth indexes of root and leaves of grapevine seedlings were significantly lower than those of CK,and except for MDA content,most physiological and biochemical indexes of the leaves were significantly lower than those under the light of 8 000 lx for 1 d.Under12 000 lx,the values of most growth indexes in root and leaves and physiological and biochemical indexes in leaves were between the 16 000 lx and 8 000 lx.In conclusion,Yinhong could grow under the lights above 16 000 lx,and would be stunted by the weak light below 8 000 lx.
