Novel Pathways for Enhancing Nonlinearity of Organics Utilizing Metal Clusters
2010 (English)In: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 114, no 28, 7590-7594 p.Article in journal (Refereed) Published
We show that ultrasmall metallic nanoparticles can be combined with large second- and third-order response organic chromophores to enhance the overall third-order response of the system. This approach can be used in combination with microscopic cascading to generate exceptionally large third-order response. Intermolecular charge-transfer coupling between the molecules and the metal clusters enhances the real part of the nonlinearity at telecommunication wavelengths, while avoiding plasmonic enhancement of one- and two-photon absorption, and minimizing optical losses. The results of density functional calculations for a molecule with large second-order response, (para)nitroaniline, show that use of a gold cluster as a link between molecular entities enhances third-order nonlinearity. Varying size and shape of the metal cluster as well as the distance between the clusters and the molecules allows fine-tuning of nonlinear response over a large range of magnitudes.
Place, publisher, year, edition, pages
2010. Vol. 114, no 28, 7590-7594 p.
IdentifiersURN: urn:nbn:se:kth:diva-29484DOI: 10.1021/jp102438mISI: 000279787300021ScopusID: 2-s2.0-77954751563OAI: oai:DiVA.org:kth-29484DiVA: diva2:395133
QC 201102042011-02-042011-02-022011-02-04Bibliographically approved