[1] Gale M T, Rossi M, Pedersen J,et al.Fabrication of continuous-relief micro-optical elements by direct laser writing in photoresists.Opt Eng, 1994,33(11): 3556～3566

[2] Ferstl M, Kuhlow B, Pawlowski E.Effect of fabrication errors on multilevel fresnel zone lenses.Opt Eng, 1994,33(04): 1229～1235

[4] Mait J N, Scherer A,et al. Diffractive lens fabricated with binary features less than 60 nm.Opt Lett,2000,25(6): 381～383

[5] Nishihara H, Suhara T.Micro Fresnel lenses.Progress in Optics XXIV,Wolf, 1987.3～37

[7] Mait J N, Prather D W, Mirotznik M S.Binary subwavelength diffractive -lens design.Optics Letters, 1998,23(9): 1343～1345

[8] Mait J N, Prather D W, Mirotznik M S.Design of binary subwavelength diffractive lenses by use of zeroth-order effective-medium theory.J O S A(A),1999,16(5): 1157～1167

[9] Prather D W,Shi Shouyuan. Fomulation and application of the FDTD method for the analysis of axially symmetric diffractive optical elements.JOSA(A),1999,16(5): 1131～1143

[10] Prather D W, Mait J N, Misotznik M S,et al.Vector-based synthesis of finite aperiodic subwavelength diffractive optical elements.J O S A(A), 1998,15(6):1599～1607