A micropolarizer of nickel nanowire arrays within an anodic alumina membrane(AAM) was fabricated by anodization of pure Al and electrodeposition of Ni,resperctively,X-ray diffraction,scanning electron microscopy and t...A micropolarizer of nickel nanowire arrays within an anodic alumina membrane(AAM) was fabricated by anodization of pure Al and electrodeposition of Ni,resperctively,X-ray diffraction,scanning electron microscopy and transmission-electron microscopy reveal that the nanowires are polyscrstal and have an average diameter of 70nm.Spectrophotometer measurements show that the nickel nanowire arrays embedded in the AAM can only transmit polarized light vertical to the wires.An extinction ratio of 25 to 30dB and an average insertion loss of 1.07dB in the wavelength range of 1-2.5um were obtained ,respectively.Thus,Ni nanowire/AAM can be used as a wire grid type micropolarizer.展开更多
We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors.A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the co...We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors.A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the condition of a space-charge-limited current.The magnetoresistance depends on the initial spin orientation of the electron with respect to the hole in electron-hole pairs,and the increasing spin-orbit coupling slows down the change in magnetoresistance with magnetic field.The field dependence,the sign and the saturation value of the magnetoresistance are composite effects of recombination and dissociation rate constants of singlet and triplet electron-hole pairs.The simulated magnetoresistance shows good consistency with the experimental results.展开更多
文摘A micropolarizer of nickel nanowire arrays within an anodic alumina membrane(AAM) was fabricated by anodization of pure Al and electrodeposition of Ni,resperctively,X-ray diffraction,scanning electron microscopy and transmission-electron microscopy reveal that the nanowires are polyscrstal and have an average diameter of 70nm.Spectrophotometer measurements show that the nickel nanowire arrays embedded in the AAM can only transmit polarized light vertical to the wires.An extinction ratio of 25 to 30dB and an average insertion loss of 1.07dB in the wavelength range of 1-2.5um were obtained ,respectively.Thus,Ni nanowire/AAM can be used as a wire grid type micropolarizer.
基金Supported by the Natural Science Foundation of Shandong Province under Grant No Y2006A18, and the Key Programme of Natural Foundation of Shandong Jianzhu University under Grant No XZ050102.
基金Project supported by the National Natural Science Foundation of China (Grant No. 11005070)and the Research Planning Project of Ministry of Housing and Urban-Rural Development,China (Grant No. 2010-K4-15)
文摘We investigated the effect of spin-orbit coupling on magnetoresistance in nonmagnetic organic semiconductors.A Lorentz-type magnetoresistance is obtained from spin-orbit coupling-dependent spin precession under the condition of a space-charge-limited current.The magnetoresistance depends on the initial spin orientation of the electron with respect to the hole in electron-hole pairs,and the increasing spin-orbit coupling slows down the change in magnetoresistance with magnetic field.The field dependence,the sign and the saturation value of the magnetoresistance are composite effects of recombination and dissociation rate constants of singlet and triplet electron-hole pairs.The simulated magnetoresistance shows good consistency with the experimental results.
