Jiming Wang et al 2005 J. Opt. A: Pure Appl. Opt. 7 748 doi:10.1088/1464-4258/7/12/007
Jiming Wang1, Liren Liu1, Maojin Yun2,1, De'an Liu1 and Ximin Liu1
Show affiliationsIn this paper an electrically controllable radial birefringent pupil filter is proposed. It consists of two polarizers and an improved electrically controllable optical azimuth rotator which has two λ/4 retarders, one electro-optical crystal and one radial birefringent crystal. The evolution and distribution of polarization states of this pupil filter are discussed. The most interesting and useful advantage of such a structure is that the characteristic of transverse superresolution and axial extended focal depth or focal shift can be obtained merely by controlling the applied voltage on the electro-optical crystal. The radial birefringent crystal azimuth angle cooperating with different electrical inductive phase differences will determine the transverse and axial intensity distribution. It is shown that for particular ranges of electrical inductive phase difference it is possible to obtain transverse superresolution along with extended focal depth or with a focal shift.
42.79.Ci Filters, zone plates, and polarizers
Issue 12 (December 2005)
Received 16 June 2005, accepted for publication 6 October 2005
Published 4 November 2005
Jiming Wang et al 2005 J. Opt. A: Pure Appl. Opt. 7 748
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