title: Atomic layer deposited second-order nonlinear optical metamaterial for back-end integration with CMOS-compatible nanophotonic circuitry.
abstract: We report the fabrication of artificial unidimensional crystals exhibiting an effective bulk second-order nonlinearity. The crystals are created by cycling atomic layer deposition of three dielectric materials such that the resulting metamaterial is noncentrosymmetric in the direction of the deposition. Characterization of the structures by second-harmonic generation Maker-fringe measurements shows that the main component of their nonlinear susceptibility tensor is about 5 pm/V, which is comparable to well-established materials and more than an order of magnitude greater than reported for a similar crystal [Appl. Phys. Lett.107, 121903 (2015)APPLAB0003-695110.1063/1.4931492]. Our demonstration opens new possibilities for second-order nonlinear effects on CMOS-compatible nanophotonic platforms.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Clemmen
authors.forename: Artur
authors.initials: A
authors.lastname: Hermans
authors.forename: Eduardo
authors.initials: E
authors.lastname: Solano
authors.forename: Jolien
authors.initials: J
authors.lastname: Dendooven
authors.forename: Kalle
authors.initials: K
authors.lastname: Koskinen
authors.forename: Martti
authors.initials: M
authors.lastname: Kauranen
authors.forename: Edouard
authors.initials: E
authors.lastname: Brainis
authors.forename: Christophe
authors.initials: C
authors.lastname: Detavernier
authors.forename: Roel
authors.initials: R
authors.lastname: Baets