Difference-frequency generation in optically poled silicon nitride waveguides.

ABSTRACT: Difference-frequency generation (DFG) is elemental for nonlinear parametric processes such as optical parametric oscillation and is instrumental for generating coherent light at long wavelengths, especially in the middle infrared. Second-order nonlinear frequency conversion processes like DFG require a second-order susceptibility χ ⁽²⁾, which is absent in centrosymmetric materials, e.g. silicon-based platforms. All-optical poling is a versatile method for inducing an effective χ ⁽²⁾ in centrosymmetric materials through periodic self-organization of charges. Such all-optically inscribed grating can compensate for the absence of the inherent second-order nonlinearity in integrated photonics platforms. Relying on this induced effective χ ⁽²⁾

SUBMITTER: Sahin E 

PROVIDER: S-EPMC8865395 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature