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

Rakesh G. Mote, Siu Fung Yu, W. Zhou, X. F. Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)


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.
Original languageEnglish
Article number191113
JournalApplied Physics Letters
Issue number19
Publication statusPublished - 24 Nov 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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