Nonlinear crystals go 3D
A 3D nonlinear photonic crystal in lithium niobate is realized by using a laser erasing technique to spatially control the crystal’s nonlinearity, locally switching it ‘on’ or ‘off’. The achievement provides a promising platform to fully control nonlinearity and interacting waves for applications in beam shaping, holography and quantum information processing.
See Zhang et al. and Ellenbogen.