gradient index lens

gradient index lens

[′grād·ē·ənt ¦in‚deks ‚lenz]
(optics)
An optical element within which the refractive index is a smooth, but not constant, function of position and, as a result, the ray paths are curved. Also known as graded index lens.
References in periodicals archive ?
To date, a number of interesting applications have been proposed and experimentally verified, such as the gradient index lens, invisible cloak and sub-wavelength imaging [8-16].
Worth noting is that, thanks to the good transmission characteristics of the ZIML as shown in Figure 2, the distance d between the ZIML and the antenna will not to be a vital parameter affecting the gain enhancement ability of the detached ZIML, distinct from lenses based on Fabry-Perot resonance and gradient index lens. One can predict that the gain of the antenna will not vary markedly with the change of the distance d.
De Leon, "Planar photonic crystal gradient index lens, simulated with a finite difference time domain method," Phys.