Mid-infrared frequency doubling using strip-loaded silicon nitride on epitaxial barium titanate thin film waveguides. Academic Article uri icon


  • Broadband mid-infrared (mid-IR) frequency doubling was demonstrated using nonlinear barium titanate (BTO) thin films. The device has a strip-loaded waveguide structure consisting of top silicon nitride (SiN) strips and an underneath BTO guiding layer. The epitaxial BTO was deposited on a strontium titanate (STO) substrate by pulsed-laser deposition. Through a SiN grating coupler, the pumping mid-IR light at wavelength =3.30-3.45m was coupled into the nonlinear BTO layer, where the spectrum of the near-infrared (NIR) second-harmonic generation was characterized. The developed BTO waveguides provide a platform for mid-IR nonlinear integrated photonics and on-chip quantum optics.

published proceedings

  • Opt Lett

author list (cited authors)

  • Zhou, J., Liu, M., Lu, M., & Lin, P. T.

citation count

  • 0

complete list of authors

  • Zhou, Junchao||Liu, Mingzhao||Lu, Ming||Lin, Pao Tai

publication date

  • December 2020