title: Electrical control of Faraday rotation at a liquid-liquid interface.
abstract: A theory is developed for the Faraday rotation of light from a monolayer of charged magnetic nanoparticles at an electrified liquid-liquid interface. The polarization fields of neighboring nanoparticles enhance the Faraday rotation. At such interfaces, and for realistic sizes and charges of nanoparticles, their adsorption-desorption can be controlled with a voltage variation<1 V, providing electrovariable Faraday rotation. A calculation based on the Maxwell-Garnett theory predicts that the corresponding redistribution of 40 nm nanoparticles of yttrium iron garnet can switch a cavity with a quality factor larger than 10(4) for light of wavelength 500 nm at normal incidence.
authors.affiliation: Department of Mechanical Engineering, Faculty of Engineering, Imperial College, London, SW7 2AZ, UK. m.marinescu@imperial.ac.uk.
authors.forename: Monica
authors.initials: M
authors.lastname: Marinescu
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Kornyshev
authors.forename: Michael E
authors.initials: ME
authors.lastname: Flatté