@article{Cai2018,
abstract = {The inherent trade-off between efficiency and bandwidth of three-wave mixing processes in $\chi$2 nonlinear waveguides is the major impediment for scaling down many well-established frequency conversion schemes onto the level of integrated photonic circuit. Here, we show that hybridization between modes of a silica microfiber and a LiNbO3 nanowaveguide, amalgamated with laminar $\chi$2 patterning, offers an elegant approach for engineering broadband phase matching and high efficiency of three-wave mixing processes in an ultra-compact and natively fiber-integrated setup. We demonstrate exceptionally high normalized second harmonic generation (SHG) efficiency of up to $\eta$nor ≈ 460% W−1 cm−2, combined with a large phase matching bandwidth of $\Delta$$\lambda$ ≈ 100 nm (bandwidth-length product of $\Delta$$\lambda$ {\textperiodcentered} L ≈ 5 $\mu$m2) near the telecom bands, and extraordinary adjustment flexibility.},
author = {Cai, Lutong and Gorbach, Andrey V. and Wang, Yiwen and Hu, Hui and Ding, Wei},
doi = {10.1038/s41598-018-31017-0},
file = {:C\:/Users/ag263/OneDrive - University of Bath/Mendeley Library/2018/Cai et al. - Scientific Reports - 2018.pdf:pdf},
issn = {2045-2322},
journal = {Scientific Reports},
keywords = {Integrated optics,Nonlinear optics},
month = {dec},
number = {1},
pages = {12478},
publisher = {Nature Publishing Group},
title = {{Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides}},
url = {http://www.nature.com/articles/s41598-018-31017-0},
volume = {8},
year = {2018}
}