Two-beam coupling and self-pumped phase conjugation properties of a Rh-doped BaTiO_(3) crystal were investigated at 633nm as the temperature was increased from 20 to 50℃.A significant decrease in response time and an...Two-beam coupling and self-pumped phase conjugation properties of a Rh-doped BaTiO_(3) crystal were investigated at 633nm as the temperature was increased from 20 to 50℃.A significant decrease in response time and an increase in gain of two-beam coupling were obtained.The self-pumped phase conjugation reflectivity was increased from 45 to 64%in this temperature range.展开更多
Photorefractivity properties of a polymer are investigated by four-wave mixing(FWM)diffraction measurements.The polymer is composed of photoconducting poly(n-vinylcarbazole),photosensitizing 2,4,7-trinitro-9-fluorenon...Photorefractivity properties of a polymer are investigated by four-wave mixing(FWM)diffraction measurements.The polymer is composed of photoconducting poly(n-vinylcarbazole),photosensitizing 2,4,7-trinitro-9-fluorenone,and optically nonlinear 4-(dicyanoviny1)-N.N-diethylaniline.Its FWM diffraction efficiency and response time as a function of,respectively,electric field and writing intensity have been determined.With a 80μm-think film,a diffraction efficiency of 7.4×10^(-4) has been obtained.The response time of the polymer is as short as 400ms at a writing intensity of 0.17W/cm^(2).展开更多
With the aid of an atomic force microscope(AFM),we study the interaction between linear DNA fragment and cisplatin.For different cisplatin concentrations,the AFM used to observe the conformation of DNA has a gradual c...With the aid of an atomic force microscope(AFM),we study the interaction between linear DNA fragment and cisplatin.For different cisplatin concentrations,the AFM used to observe the conformation of DNA has a gradual change.The contour length,the end-to-end distance and the local bend angles of the linear DNA fragment can be accurately measured.The persistence length of DNA interacting with cisplatin is decreased with the increasing cisplatin concentration.Furthermore,it is demonstrated that the local bend angles of DNA chains are increased by the binding interaction of cisplatin.展开更多
基金Supported by a grant for a key research project(No.2)in the Climbing Program from the State Science and Technology Commission of China.
文摘Two-beam coupling and self-pumped phase conjugation properties of a Rh-doped BaTiO_(3) crystal were investigated at 633nm as the temperature was increased from 20 to 50℃.A significant decrease in response time and an increase in gain of two-beam coupling were obtained.The self-pumped phase conjugation reflectivity was increased from 45 to 64%in this temperature range.
基金Supported by the National Natural Science Foundation of China。
文摘Photorefractivity properties of a polymer are investigated by four-wave mixing(FWM)diffraction measurements.The polymer is composed of photoconducting poly(n-vinylcarbazole),photosensitizing 2,4,7-trinitro-9-fluorenone,and optically nonlinear 4-(dicyanoviny1)-N.N-diethylaniline.Its FWM diffraction efficiency and response time as a function of,respectively,electric field and writing intensity have been determined.With a 80μm-think film,a diffraction efficiency of 7.4×10^(-4) has been obtained.The response time of the polymer is as short as 400ms at a writing intensity of 0.17W/cm^(2).
基金by the National Natural Science Foundation of China under Grant No 10834014the National Basic Research Program of China under Grant No 2009CB930704。
文摘With the aid of an atomic force microscope(AFM),we study the interaction between linear DNA fragment and cisplatin.For different cisplatin concentrations,the AFM used to observe the conformation of DNA has a gradual change.The contour length,the end-to-end distance and the local bend angles of the linear DNA fragment can be accurately measured.The persistence length of DNA interacting with cisplatin is decreased with the increasing cisplatin concentration.Furthermore,it is demonstrated that the local bend angles of DNA chains are increased by the binding interaction of cisplatin.
