ORGANIC-INORGANIC DIELECTRIC MULTILAYER SYSTEMS AS HIGH REFLECTIVITY DISTRIBUTED BRAGG REFLECTORS

Unprecedentedly high reflectivity distributed Bragg reflectors consist ing of fluorocarbon polymer (CFx) and high refractive index inorganic oxide multilayers have been fabricated by means of assisted ion-beam s puttering at room temperature. Multilayer stacks consisting of a CFx/T iOx and CFx/HfOx pairs exhibit reflectivities larger than 98% in the i nfrared and ultraviolet spectral region, respectively. The superior wi de tunability and the high efficiency, with respect to inorganic-inorg anic multilayers is due to the exceptionally low refractive index of t he fluorcarbon polymer (n similar or equal to 1.35) on a very large sp ectral region (300-2000 nm). (C) 1997 American Institute of Physics.