Radially polarized beams, focused by a high numerical aperture （NA） objective, have non-propagating fields along the propagation axis in the focal region, which leads to a higher axial trapping efficiency in compari...Radially polarized beams, focused by a high numerical aperture （NA） objective, have non-propagating fields along the propagation axis in the focal region, which leads to a higher axial trapping efficiency in comparison with linearly polarized beams. We propose a design for converting a lowest-order radially polarized beam （R-TEM01） to a double-ring radial polarization distribution （DR R-TEM01） through a specially designed polarization rotator. The phases of the two rings of this beam differ by π. Numerical results evaluated by rigorous T-matrix method show that the DR R-TEM01 beam can improve the axial trapping efficiency compared with the R-TEM01 beam, provided that the size of trapped particles is of order of the wavelength of the beam.展开更多
Using the full-vector plane-wave expansion method, a kind of PMMA-based polarization-maintaining microstructured optical fibre （PM-mPOF） is theoretically studied. Dependence of the cutoff wavelengths of the two orth...Using the full-vector plane-wave expansion method, a kind of PMMA-based polarization-maintaining microstructured optical fibre （PM-mPOF） is theoretically studied. Dependence of the cutoff wavelengths of the two orthogonal polarization states （polarized along the two principal axes of PM-mPOF） on the structure parameters of the fibre is investigated in detail A single-polarization single-mode （SPSM） PM-mPOF working in the visible region is designed and optimized with the result of the maximum SPSM bandwidth of 140nm.展开更多
A thin oriented bacteriorhodopsin(bR)film is deposited on a stainless steel slide by use of the electrophoretic sedimentation method.A junction is made with electrolyte gels having a counterelectrode to construct a bR...A thin oriented bacteriorhodopsin(bR)film is deposited on a stainless steel slide by use of the electrophoretic sedimentation method.A junction is made with electrolyte gels having a counterelectrode to construct a bR-based photoelectric detector.The photoelectric response signal to a 10ns laser pulse is measured.A theory on the photoelectric kinetics of bR is developed based on the concept of the charge displacement current and the bR photocycle rate equations.Comparison between the theoretical and experimental results proves that the bR photoelectric response to a short laser pulse is a multi-exponential process.The decay time constants and amplitudes of each exponential component are obtained by data fitting.展开更多
基金National Natural Science Foundation of China(20564001)the Natural Science Foundation of Jiangxi,China(050017 and 0620012)the Science Funds of the Education Office of Jiangxi,China([2007]279).
基金Supported by the National Natural Science Foundation of China under grant No 10874240, and the Shaanxi Province 13115 Science and Technology Innovative Project under grant No 2008ZDKG-68.
文摘Radially polarized beams, focused by a high numerical aperture （NA） objective, have non-propagating fields along the propagation axis in the focal region, which leads to a higher axial trapping efficiency in comparison with linearly polarized beams. We propose a design for converting a lowest-order radially polarized beam （R-TEM01） to a double-ring radial polarization distribution （DR R-TEM01） through a specially designed polarization rotator. The phases of the two rings of this beam differ by π. Numerical results evaluated by rigorous T-matrix method show that the DR R-TEM01 beam can improve the axial trapping efficiency compared with the R-TEM01 beam, provided that the size of trapped particles is of order of the wavelength of the beam.
基金Supported by the National Natural Science Foundation of China under Grant Nos 60537060 and 60678023, and the Director Foundation of Xi＇an Institute of 0ptics and Precision Mechanics of Chinese Academy of Sciences under Grant No 0654221ZZ0.
文摘Using the full-vector plane-wave expansion method, a kind of PMMA-based polarization-maintaining microstructured optical fibre （PM-mPOF） is theoretically studied. Dependence of the cutoff wavelengths of the two orthogonal polarization states （polarized along the two principal axes of PM-mPOF） on the structure parameters of the fibre is investigated in detail A single-polarization single-mode （SPSM） PM-mPOF working in the visible region is designed and optimized with the result of the maximum SPSM bandwidth of 140nm.
基金Supported by the Foundation of State Key Laboratory of Transient Optics and Technology under Grant No.YAK9705the President Foundation of Chinese Academy of Sciences under Grant No.40007059.
文摘A thin oriented bacteriorhodopsin(bR)film is deposited on a stainless steel slide by use of the electrophoretic sedimentation method.A junction is made with electrolyte gels having a counterelectrode to construct a bR-based photoelectric detector.The photoelectric response signal to a 10ns laser pulse is measured.A theory on the photoelectric kinetics of bR is developed based on the concept of the charge displacement current and the bR photocycle rate equations.Comparison between the theoretical and experimental results proves that the bR photoelectric response to a short laser pulse is a multi-exponential process.The decay time constants and amplitudes of each exponential component are obtained by data fitting.
