title: Second harmonic generation in nano-structured thin-film lithium niobate waveguides.
abstract: Integrated thin-film lithium niobate platform has recently emerged as a promising candidate for next-generation, high-efficiency wavelength conversion systems that allow dense packaging and mass-production. Here we demonstrate efficient, phase-matched second harmonic generation in lithographically-defined thin-film lithium niobate waveguides with sub-micron dimensions. Both modal phase matching in fixed-width waveguides and quasi-phase matching in periodically grooved waveguides are theoretically proposed and experimentally demonstrated. Our low-loss (~3.0 dB/cm) nanowaveguides possess normalized conversion efficiencies as high as 41% W-1cm-2.
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.forename: Xiao
authors.initials: X
authors.lastname: Xiong
authors.forename: Nicolas
authors.initials: N
authors.lastname: Andrade
authors.forename: Vivek
authors.initials: V
authors.lastname: Venkataraman
authors.forename: Xi-Feng
authors.initials: XF
authors.lastname: Ren
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo
authors.forename: Marko
authors.initials: M
authors.lastname: Lončar