Sub-wavelength modulation of χ⁽²⁾ optical nonlinearity in organic thin films.

ABSTRACT: Modulating the second-order nonlinear optical susceptibility (χ⁽²⁾) of materials at the nanoscale represents an ongoing technological challenge for a variety of integrated frequency conversion and nonlinear nanophotonic applications. Here we exploit the large hyperpolarizability of intermolecular charge transfer states, naturally aligned at an organic semiconductor donor-acceptor (DA) interface, as a means to control the magnitude and sign of χ⁽²⁾ at the nanoscale. Focusing initially on a single pentacene-C₆₀ DA interface, we confirm that the charge transfer transition is strongly aligned orthogonal to the heterojunction and find that it is responsible for a large interfacial nonlinearity probed via second harmonic generation that is sufficient to achieve d

SUBMITTER: Yan Y 

PROVIDER: S-EPMC5290150 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature