Probing polarization and dielectric function of molecules with higher order harmonics in scattering-near-field scanning optical microscopy


Journal Article

The idealized system of an atomically flat metallic surface [highly oriented pyrolytic graphite (HOPG)] and an organic monolayer (porphyrin) was used to determine whether the dielectric function and associated properties of thin films can be accessed with scanning-near-field scanning optical microscopy (s-NSOM). Here, we demonstrate the use of harmonics up to fourth order and the polarization dependence of incident light to probe dielectric properties on idealized samples of monolayers of organic molecules on atomically smooth substrates. An analytical treatment of light/sample interaction using the s-NSOM tip was developed in order to quantify the dielectric properties. The theoretical analysis and numerical modeling, as well as experimental data, demonstrate that higher order harmonic scattering can be used to extract the dielectric properties of materials with tens of nanometer spatial resolution. To date, the third harmonic provides the best lateral resolution (∼50 nm) and dielectric constant contrast for a porphyrin film on HOPG. © 2009 American Institute of Physics.

Full Text

Duke Authors

Cited Authors

  • Nikiforov, MP; Kehr, SC; Park, TH; Milde, P; Zerweck, U; Loppacher, C; Eng, LM; Therien, MJ; Engheta, N; Bonnell, D

Published Date

  • December 28, 2009

Published In

Volume / Issue

  • 106 / 11

International Standard Serial Number (ISSN)

  • 0021-8979

Digital Object Identifier (DOI)

  • 10.1063/1.3245392

Citation Source

  • Scopus