Graded Refractive Index Lenses (GRIN)
Gradient-index optics is the branch of materials science dealing with the production and characterization of gradually changing refractive index lenses. These lenses are able to eliminate the aberrations caused by traditional spherical lenses without requiring variation to the shape of the lens. Gradient index lenses may have a refraction gradient that is spherical, axial, or radial.
(Wikipedia, Graded Refractive Index Lenses (GRIN), 2/7/2011)
Recent Journal Articles
2/4/2011
Preparation and characterization of organic–inorganic microcomposite cylindrical GRIN lens
(941-946) Polymer Journal 42 #12 (2010)
Abstract
Nehei et al of Keio University, Japan fabricated organic–inorganic microcomposite cylindrical GRIN lenses with high thermal stability by the spontaneous frontal polymerization (SFP) technique and diffusion of two organic materials with different refractive indices into an inorganic wet-gel. The obtained microcomposite cylindrical GRIN lenses are not only thermally stable but also have a controlled refractive index profile, due to their inorganic matrix. The lenses are also highly transparent. This SFP technique also enabled high reproducibility of microcomposite cylindrical GRIN lenses with smooth periphery in this study, indicating the high potential of this process for practical application. (RDC 1/3/2011)