Superresolution, extended focal depth or focal shift with electrically controllable radial birefringent filter

Wang, Jiming; Liu, Liren; Yun, Maojin; Liu, De an; Liu, Ximin

doi:10.1088/1464-4258/7/12/007

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…It can be found that the focal shift u f ¼ AE0.07, AE0.42, AE0.57, AE0.76, 0 can be achieved when ' 1 ¼ AE0.2, ' 1 ¼ AE0.4, ' 1 ¼ AE0.6 , ' 1 ¼ AE0.8, ' 1 ¼ . As we know from our earlier published work [6], this focal shift is attributed to the imaginary part of the pupil function. When ' 1 ¼ , there is no imaginary part in the pupil function, so there should be no focal shift.…”

Section: Focal Shift and Extended Focal Depthmentioning

confidence: 60%

“…Several techniques were reported recently for achieving focal shift and extended focal depth in optical imaging systems [4][5][6][7][8]. Most of the conventional techniques for achieving the focal shift and extended focal depth take advantage of the scalar wave properties of light.…”

Section: Introductionmentioning

confidence: 99%

“…As for the focal shift, image properties utilizing polarization masks have been reported and researched systematically. In our previous work [6], superresolution, extended focal depth and focal shift were obtained with an electrically controllable radial birefringent filter.…”

Section: Introductionmentioning

confidence: 99%

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Focal shift and extended focal depth with tunable pupil filter

Yun

Lee

2008

Journal of Modern Optics

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Extended focal depth and focal shift are very important in microscopy, imaging and optical storage systems, and have attracted much attention in recent years. In order to obtain the extended focal depth and focal shift, a new kind of tunable pupil filter is proposed in this article. It consists of one half-wave plate between two quarter-wave plates, and the half-wave plate is made up of two zones that can rotate with respect to each other. By analyzing the intensity distribution in the focal region of the optical system with such a device, it reveals that focal shift can be realized by rotating any zone of the half-wave plate. When the phase difference of the two zones is , the extended focal depth and transverse superresolution can be obtained at the same time. Therefore, it may be feasible to use such a tunable pupil filter in optical systems that need focal shift and extended focal depth.

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Section: Focal Shift and Extended Focal Depthmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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Focal shift and extended focal depth with tunable pupil filter

Yun

Lee

2008

Journal of Modern Optics

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“…These beams have the transverse maximum intensity along with the optical axis after passing through the focusing system, therefore the position of axial maximal irradiance of the focused beam is usually viewed as the actual focal position [2,3], which is determined by the axial intensity distribution of the beam. The focal shifts may play a crucial role in achievement of super resolution and in optical trapping [9]. In optical trapping system there are two kinds of forces acting on the particle.…”

Section: Introductionmentioning

confidence: 99%

Focal Shifting of Radially Polarized Laguerre Bessel Gaussian Beam with Radial Cosine Phase Plate

Prabakaran¹,

Rajesh²,

Hariharan³

et al. 2018

IJASE

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Focal shift of radially laguerre polarized Bessel Gaussian beams induced by cosine phase masks are investigated theoretically by vector diffraction theory. Results show that when the radially polarized laguerre Bessel Gaussian beam with cosine phase plate is focused, the focal pattern differs considerably with frequency parameter (C) in the cosine function term. Increasing the value of frequency parameter in the cosine part of the phase mask, focal shift may occur, simultaneously, the focal shift direction may change. Moreover, by altering frequency parameter of the phase mask will change the energy distributions of maximum intensity peak and other small intensity peaks.

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