Journal
OPTICS LETTERS
Volume 46, Issue 2, Pages 432-435Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.414702
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Funding
- U.S. Department of Energy [DE-SC0019406]
- David and Lucile Packard Foundation
- National Science Foundation [EFMA-1640959]
- Army Research Office [911NF-18-1-0020, W911NF-19-2-0115]
- U.S. Department of Energy (DOE) [DE-SC0019406] Funding Source: U.S. Department of Energy (DOE)
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In high-Q lithium niobate ring resonators at cryogenic temperatures, intracavity Bragg scattering induced by the photorefractive effect was observed to create a long-lived periodic space-charge field imprinting a refractive index modulation pattern. This phenomenon enhances back scattering of incoming light and leads to selective and reconfigurable mode splittings. Despite being undesired for many applications, this photorefractive-induced Bragg scattering effect could be utilized to enable optically programmable photonic components.
We report intracavity Bragg scattering induced by the photorefractive (PR) effect in high- Q lithium niobate ring resonators at cryogenic temperatures. We show that when a cavity mode is strongly excited, the PR effect imprints a long-lived periodic space-charge field. This residual field in turn creates a refractive index modulation pattern that dramatically enhances the back scattering of an incoming probe light, and results in selective and reconfigurable mode splittings. This PR-induced Bragg scattering effect, despite being undesired for many applications, could be utilized to enable optically programmable photonic components. (C) 2021 Optical Society of America
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