Sidewall-poled x-cut thin-film lithium niobate waveguides with 215 nm periods produce counter-propagating and backward-propagating light, including the first backward-propagating spontaneous parametric down-conversion.
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Nanodomain poling unlocking backward nonlinear light generation in thin film lithium niobate
Sidewall-poled x-cut thin-film lithium niobate waveguides with 215 nm periods produce counter-propagating and backward-propagating light, including the first backward-propagating spontaneous parametric down-conversion.