## Analysis of a closed-boundary axilens with long focal depth and high transverse resolution based on rigorous electromagnetic theory

JOSA A, Vol. 19, Issue 10, pp. 2030-2035 (2002)

http://dx.doi.org/10.1364/JOSAA.19.002030

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### Abstract

We find that a microcylindrical axilens with a closed boundary and with an *f*-number less than 1 still can achieve the properties of long focal depth and high transverse resolution, unlike a microcylindrical axilens with an open boundary, which fails to maintain those properties for low *f*-numbers. The focusing characteristics of the closed-boundary axilens and the open-boundary axilens are numerically investigated based on the boundary integral method. The numerical results show that the ratio of the extended focal depth of the closed-boundary axilens to the focal depth of the conventional microlens can reach up to 1.26 and 2.12 for the preset focal depths 3 and 5 μm, respectively, even though the *f*-number is reduced to 1/3.

© 2002 Optical Society of America

**OCIS Codes**

(050.0050) Diffraction and gratings : Diffraction and gratings

(050.1970) Diffraction and gratings : Diffractive optics

(220.0220) Optical design and fabrication : Optical design and fabrication

**Citation**

Jia-Sheng Ye, Bi-Zhen Dong, Ben-Yuan Gu, Guo-Zhen Yang, and Shu-Tian Liu, "Analysis of a closed-boundary axilens with long focal depth and high transverse resolution based on rigorous electromagnetic theory," J. Opt. Soc. Am. A **19**, 2030-2035 (2002)

http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-19-10-2030

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