Article

Plasmonics

, Volume 8, Issue 2, pp 715-722

Sensing Nanometer Depth of Focused Optical Fields with Scanning Surface Plasmon Microscopy

  • Lotfi BerguigaAffiliated withCNRS, USR3010, Université de Lyon
  • , Elise Boyer-ProveraAffiliated withCNRS, USR3010, Université de Lyon
  • , Juan ElezgarayAffiliated withCNRS, UMR 5248, Université Bordeaux 1–ENITAB
  • , Françoise ArgoulAffiliated withCNRS, USR3010, Université de Lyon Email author 

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Abstract

Evanescent wave imaging has been developed in the past decades for discriminating sub-micronic structures confined on a planar surface from bulk medium. However, this imaging method assumes a correct orientation of the objective lens versus the normal of the sample plane (null tilt angle) for a uniform evanescent illumination of the sample. Here, we propose to use the \(V(Z)\) response of a heterodyne scanning microscope coupled to a high numerical aperture lens to compensate the tilt, scanning images in three dimensions. This method can be used in standard glass to dielectric reflection regime or coupled to surface plasmon resonance. We show that in the second case, we can afford tilt angle corrections better than 10\(^{-4}\) radian. As an illustration, this method is applied to a patterned surface with nanometer-squared silica islets and to adsorbed nanoparticles.

Keywords

Surface plasmon microscopy Evanescent waves Heterodyne interferometry Scanning microscopy Inverse problem