Tight focusing of partially coherent, partially polarized vortex beams

Hua, Limin; Chen, Baosuan; Chen, Ziyang; Pu, Jixiong

doi:10.1088/2040-8978/13/7/075702

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…In recent years, tight focusing of radially and azimuthally polarized light beams through a high numerical aperture (NA) objective lens has attracted intensive attention and extensive investigation, because of their fascinating features and wide potential applications [1][2][3][4][5][6][7][8][9][10]. It is found that, when radial polarizations are highly focused, a very strong longitudinal electric field component will emerge in the focal region, which forms an extremely tight focal spot.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that a tight focal spot is of great help to improve the resolution of microscopy [11,12], enhance laser cutting ability in material processing [13], and can also be applied to improve the performance of optical tweezers due to the reduction of scattering [10,14,15]. Tight focusing of the electromagnetic field with various polarizations have been investigated, such as the linearly polarized, circularly polarized, radially polarized, azimuthally polarized, and hybridly polarized beams, as well as vortex beams [1][2][3][4][5][6][7]. It is also revealed in the vicinity of the focus that, for linear incident polarization, the generated longitudinal polarized component is not rotationally symmetric, which causes an asymmetric deformation of the focal spot [16,17]; for radial polarization input, it generates a strong longitudinal electric field component in the focal zone [11,18]; In contrast, the azimuthal incident polarization produces a strong magnetic field on the optical axis [19], meanwhile the electric field is purely transverse and null at the center [2].…”

Section: Introductionmentioning

confidence: 99%

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Tight focusing of radially polarized beams modulated by a fractal conical lens

Liu

Huang

Wang

et al. 2017

Optics Communications

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A novel high numerical aperture (NA) focusing system with a fractal conical lens (FCL) is proposed, and tight focusing of radially polarized beams through the proposed optical system is investigated theoretically and numerically. The influence of several relevant factors, including the FCL's stage S, objective lens' NA, and truncation parameter 0, on the targeted beam's focusing characteristics in the focal region is discussed in detail. It is found that, when a FCL with S≥0 is employed, position of the major focal point would shift from the geometric focal point, and the focused intensity distributions cannot maintain symmetrical about the focus any more, although they present different profiles for various truncation parameters 0. When S ≥2, multiple focal points can be generated, i.e., a single major focus and a series of subsidiary foci surrounding it along the optical axis, which form a focal region. These unique focusing characteristics with a FCL are remarkably different from that of without a FCL. The fascinating findings here may be taken advantage of when using radially polarized beams in exploiting new-type optical tweezers and making use of a FCL.

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