Efficient parametric frequency conversions in lithium niobate nanophotonic chips
Abstract
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 , and broadband difference frequency generation with similar efficiency over a 4.5-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.
Cite
@article{arxiv.1903.08722,
title = {Efficient parametric frequency conversions in lithium niobate nanophotonic chips},
author = {Jia-yang Chen and Yong Meng Sua and Zhao-hui Ma and Chao Tang and Zhan Li and Yu-ping Huang},
journal= {arXiv preprint arXiv:1903.08722},
year = {2019}
}