Publication: Liquid-crystal tunable filter based on sapphire microspheres
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Gilardi, Giovanni
Donisi, Domenico
Beccherelli, Romeo
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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.
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Optical Society of America (OSA)
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Optics Letters
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10.1364/OL.34.003253
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