title: Liquid-crystal tunable filter based on sapphire microspheres.
abstract: We design an integrated optoelectronic device based on the whispering-gallery modes of a sapphire microsphere integrated with a liquid-crystal tuning medium to produce a narrowband, electrically tunable, channel-dropping filter. The sapphire microsphere is glued over a diffused waveguide in a glass substrate. At the base of the microsphere, a small volume of liquid crystal is infiltrated. We numerically evaluate the performance of the device and demonstrate a voltage tuning of the narrowband resonances.
authors.affiliation: Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, Via del Fosso del Cavaliere 100, Roma, Italy. giovanni.gilardi@artov.imm.cnr.it
authors.forename: Giovanni
authors.initials: G
authors.lastname: Gilardi
authors.forename: Domenico
authors.initials: D
authors.lastname: Donisi
authors.forename: Ali
authors.initials: A
authors.lastname: Serpengüzel
authors.forename: Romeo
authors.initials: R
authors.lastname: Beccherelli