Journal
OSA CONTINUUM
Volume 2, Issue 10, Pages 2914-2924Publisher
OPTICAL SOC AMER
DOI: 10.1364/OSAC.2.002914
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Funding
- National Science Foundation [1641094, 1842680]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1842680] Funding Source: National Science Foundation
- Directorate For Engineering
- Emerging Frontiers & Multidisciplinary Activities [1641094] Funding Source: National Science Foundation
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Chip-integrated nonlinear photonics holds the key for advanced optical information processing with superior performance and novel functionalities. Here, we present an optimally mode-matched, periodically poled lithium niobate nanowaveguide for efficient parametric frequency conversions on chip. Using a 4-mm nanowaveguide with subwavelength mode confinement, we demonstrate second harmonic generation with efficiency over 2200% W-1 cm(-2), and broadband difference frequency generation over a 4.3-THz spectral span. These allow us to generate correlated photon pairs over multiple frequency channels via spontaneous parametric down conversion, all in their fundamental spatial modes, with a coincidence to accidental ratio as high as 600. The high efficiency and dense integrability of the present chip devices may pave a viable route to scalable nonlinear applications in both classical and quantum domains. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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