Abstract

Signal processing in thin film waveguides requires the use of diffraction limited aberration-free lenses. A major factor limiting the performance of all the thin film waveguide lenses is the small Δn that can be obtained using existing materials. Currently, only the Geodesic and the Luneberg lenses have been investigated¹-⁴. They are basically thick lenses. At low F-numbers, they have exhibited large aberrations. Corrections for these aberrations are hindered by the difficulties in the fabrication processes for obtaining non-spherical contours.

© 1978 Optical Society of America