We present what we believe is a new hybrid objective consisting of a gradient-index optical element that has external flat refracting surfaces and is made of two different inhomogeneous materials separated by a cemented spherical surface. Microstructures of diffractive lenses are placed on the flat external surfaces of the objective. The most surprising property of this objective is that even calculation in the area of the third- and the fifth-order aberrations yields an efficient design for imaging with a Rayleigh resolution of 1 μm.
© 2001 Optical Society of America
Grigoriy I. Greisukh, Evgeniy G. Ezhov, and Sergei A. Stepanov, "Aberration Properties and Performance of a New Diffractive-Gradient-Index High-Resolution Objective," Appl. Opt. 40, 2730-2735 (2001)