<title>Binary Gabor zone plate generating special pattern</title>

Abstract

AbstractWe have proposed a novel principle for design of the binary GZP that can produce the desired pattern in the focal plane. The modified GZP can be fabricated as easily as the FZP. The proposed GZP has great flexibility in terms of manipulating the focusing properties. Optical experiments have confirmed the reliability of the GZP in focusing light into the specified area. The low cost and easy production of the element show that it can serve an alternative to refractive lens in the short wavelength region where refractive optics is not applicable owing to possible strong absorption. Keyword: Fresnel zone plate, Gabor zone plate, binary optics, diffractive opticalelement1. IntroductionConventional refractive lens have limited capability of manipulating the focusing property due to manufacturing difficulty. Alternatively, computer-generated diffractive elements can provide greater feasibility in focusing specified patterns. The mostcommon used diffractive element is the Fresnel zone plate(FZP), which consists of aseries of concentric ring-shaped zones with alternating zero and full transmittance1.Diffractive element having stair-like transmittance profile, such as FZP, can be easily