Subwavelength focusing behavior of high numerical-aperture phase Fresnel zone plates under various polarization states

Mote, Rakesh G.; Yu, S. F.; Zhou, W.; Li, X. F.
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p191113
Academic Journal
An analytical model is developed to study the subwavelength focusing characteristics of a binary phase Fresnel zone plate (FZP). The model shows that high numerical-aperture phase FZP under the illumination of linear polarized light produces rotationally asymmetric focal spot with beamwidth varying from 0.36λ to 0.79λ, where λ is the wavelength. On the other hand, rotationally symmetric focal spot with minimum beamwidth of 0.39λ can be obtained from the illumination of radial polarized light.


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