Liquid-crystal tunable filter based on sapphire microspheres.
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.
Gilardi
Giovanni
G
Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, Via del Fosso del Cavaliere 100, Roma, Italy. giovanni.gilardi@artov.imm.cnr.it
Donisi
Domenico
D
Serpengüzel
Ali
A
Beccherelli
Romeo
R