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Focus shaping of Weierstrass solid immersion lens by an axisymmetric Bessel-modulated Gaussian beam

100%

Dong X. , Geng T. , Zhuang S.

tom Vol. 43, nr 2

s. 247--259

Weierstrass solid immersion lens (SIL) has been used to obtain superresolution because a smaller focal size is desirable. In this paper, focus shaping of Weierstrass SIL illuminated by an axisymmetric Bessel-modulated Gaussian beam (QBG beam) is investigated. It has been found theoretically that the sharper focusing of Weierstrass SIL disappears for a certain beam order of QBG beam. For case of a smaller beam order, the focus still locates on the plane of Weierstrass SIL and Weierstrass SIL still plays a tighter focusing role. However, when the beam order increases continuously, the focus lefts the plane of Weierstrass SIL, and shifts along an optical axis considerably. In addition, under condition of the higher beam order, the dependence of the focal shift on the beam order is nearly linear, which may be used to alter a focal position conveniently.

Focus shaping of Bessel-Gauss beam with radial varying polarization

75%

Gao X. , Fu R. , Shen H. , Dong X. , Geng T. , Zhuang S.

tom Vol. 42, nr 3

481-491

Focusing properties of Bessel-Gauss beam with radial varying polarization are investigated based on vector diffraction theory in this article. The polarization angle formed by polarization direction and radial coordinate is the function of the radial distance in pupil plane, and one polarization parameter indicates the speed of change of polarization angle. It was found that the intensity distribution in focal region can be altered considerably by the beam parameter and polarization parameter. For a small beam parameter, the focal spot broadens transversely, distorts into ring focus, and then evolves back into focal spot on increasing polarization parameter. When beam parameter gets higher, focal pattern becomes complicated and the focus evolution principle with increasing beam parameter also changes significantly. Some novel focal patterns may appear, including multiple intensity rings, dark hollow focus, cylindrical crust focus.

Analysis of miRNA-seq combined with gene expression profile reveals the complexity of salinity stress response in Oryza sativa

63%

Wang Q. , Geng T. , Zhu S. , Li R. , Tong Y. , Wang S. , Chen F. , Tang L. , He Y.

Acta Physiologiae Plantarum

2017

tom 39

nr 12