Lithium niobate (LN) is an excellent nonlinear photonic material due to its large electro-optic (EO) coefficient, second order (χ^((2) )) and Kerr (χ^((3))) nonlinearity, along with a wide optical transparency window. Thanks to the recent advances in nanofabrication technology, monolithic LN waveguides with high optical confinement and ultralow linear loss has been achieved, which was critical to the success of the silicon-based platform in the past decade. Highly efficient and controllable light-matter interactions can be achieved using optical, electrical, or mechanical waves at extremely compact footprints. In this talk, I will review our recent developments of 1) optical frequency combs, 2) generation and measurement of ultrafast optical waveforms. Combination of multiple nonlinearities of LN unlocks ultrabroadband electromagnetic spectrum from microwave to mid-infrared. Lastly, I will discuss the potential of LN photonic platform for scaling up and accelerating classical and quantum technologies in sensing, photonic computing, and communication networks.
Prof. Jelena Vučković (Stanford University) discusses her research and inspirations, in conversation with Advanced Photonics Early Career Editorial Board Member Prof. Menjie Yu (University of Southern California).
Lithium niobate (LN) is a well-known material extensively used for optical modulators, thanks to its large electro-optic coefficient. The advancement of thin-film LN technology has sparked tremendous interest in the field of integrated optics. The capability of co-integration ultralow loss monolithic optical waveguides with highly efficient microwave control could enable next-generation, completely novel electro-optic and nonlinear photonic devices with advanced functionalities in a small footprint. Here, we discuss the recent development of electro-optic frequency shifters and beamsplitters, acousto-optic modulators, and electro-optic frequency combs, powered by integrated LN photonics.
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