title: Analysis of low F-number dual micro-axilens array with binary structures by rigorous electromagnetic theory.
abstract: We investigate a two-dimensional low F-number dual micro-axilens array with binary structures based on a rigorous electromagnetic theory. The focal characteristics of a binary dual micro-axilens array (BDMA), including axial performances (focal depth and focal shift) and transverse performances (focal spot size and diffraction efficiency), have been analyzed in detail for different F-numbers, different incident polarization (TE and TM) waves, and different distances between micro-axilens. Numerical results reveal that the interference effect of a BDMA is not very evident, which is useful for building a BDMA with a high fill factor, and the focal characteristics of a BDMA are sensitive to the polarization of an incident wave. The comparative results have also shown that the diffraction efficiency of a BDMA will increase and the focal spot size of a BDMS will decrease when the F-number increases, for both TE polarization and TM polarization, respectively. It is expected that this investigation will provide useful insight into the design of micro-optical elements with high integration.
authors.affiliation: Department of Electro-Optical Engineering, School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China. fengdi@tsinghua.org.cn
authors.forename: Di
authors.initials: D
authors.lastname: Feng
authors.forename: Li-Shuang
authors.initials: LS
authors.lastname: Feng
authors.forename: Chun-Xi
authors.initials: CX
authors.lastname: Zhang