Abstract

This paper describes the preparation and properties of Langmuir (long-chain fatty-acid) films, for use as optical waveguides. It is shown how the refractive index and molecular thickness can be estimated by probing the films with a guided wave, and how such layers may be utilised to modify the propagation characteristics of pre-fabricated guiding structures. Cases of isotropic and anisotropic guides formed from such films are discussed, together with further uses of such films as cladding to guides and other materials.