title: New difference reflectance methods for study of small interfacial effects.
abstract: Two sensitive differential optical techniques useful for study of small reflectance or absorptive differences between two interfaces are described. The first scheme employs a mechanically chopped light beam impinging on an arrangement of symmetrical dual cells to allow detection of differential reflectances DeltaR/R<10(-3). The second is a polarization-modulated beam-split laser version of the same method yielding approximately the same sensitivity. Representative measurements of voltage-induced reflectance changes at liquid-solid interfaces using these methods are given.
authors.affiliation: Optical Sciences Center, University of Arizona, Tucson, Arizona 85721.
authors.forename: E D
authors.initials: ED
authors.lastname: Huber
authors.forename: S O
authors.initials: SO
authors.lastname: Sari