Hexagonally Poled Lithium Niobate: A Two-Dimensional Nonlinear Photonic Crystal
Neil G. R. BroderickOptoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United KingdomG.W. RossOptoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United KingdomHerman L. OfferhausOptoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United KingdomDavid J. RichardsonOptoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United KingdomD.C. HannaOptoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United Kingdom
2000en
ABI
Annotatsiya
We report on the fabrication of what we believe is the first example of a two-dimensional (2D) nonlinear photonic crystal [Berger, Phys. Rev. Lett. 81, 4136 (1998)], where the refractive index is constant but where the 2nd order nonlinear susceptibility is spatially periodic. Such crystals allow for efficient quasi-phase-matched 2nd harmonic generation using multiple reciprocal lattice vectors. External 2nd harmonic conversion efficiencies >60% were measured with picosecond pulses. The fabrication technique is extremely versatile and should allow for the fabrication of a broad range of 2D crystals including quasicrystals.
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