Large optical nonlinearity enabled by coupled metallic quantum wells.

ABSTRACT: New materials that exhibit strong second-order optical nonlinearities at a desired operational frequency are of paramount importance for nonlinear optics. Giant second-order susceptibility χ ⁽²⁾ has been obtained in semiconductor quantum wells (QWs). Unfortunately, the limited confining potential in semiconductor QWs causes formidable challenges in scaling such a scheme to the visible/near-infrared (NIR) frequencies for more vital nonlinear-optic applications. Here, we introduce a metal/dielectric heterostructured platform, i.e., TiN/Al₂O₃ epitaxial multilayers, to overcome that limitation. This platform has an extremely high χ ⁽²⁾ of approximately 1500 pm/V at NIR frequencies. By combining the aforementioned heterostructure with th

SUBMITTER: Qian H 

PROVIDER: S-EPMC6344563 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature