Xiaopeng Hu

TL;DR: In this article, a femtosecond laser was used to selectively erase the nonlinear coefficients in a LiNbO3 crystal, which can effectively control nonlinear optical interactions through quasi-phase matching.

TL;DR: Efficient nonlinear beam shaping using three-dimensional lithium niobate photonic crystals fabricated using a femtosecond-laser-engineering technique paves a way for its applications in optical communication, super-resolution imaging, high-dimensional entangled source, etc.

TL;DR: A general theory and technique for domain engineering with conventional quasi-phase-matching (QPM) structures being the special cases with the concept of local QPM suggested that the QPM is fulfilled only locally not globally.

TL;DR: In this paper, a 6-mm-long periodically poled LNOI ridge waveguide with an optimized duty cycle (50:50) using an active domain structure monitoring method was fabricated, and the performance of second-harmonic generation and difference-frequency generation in the nanophotonic waveguide was characterized.

TL;DR: Efficient second-harmonic generations (SHG) were revealed at the fundamental wavelength of λ=1.55 μm with good field confinement in a hybrid plasmonic waveguide composed of a nonlinear dielectric waveguide and a metal film with a separation of a thin air gap.