Send to:

Choose Destination
See comment in PubMed Commons below
Nano Lett. 2007 Mar;7(3):557-64. Epub 2007 Feb 15.

Optical field enhancement at cusps between adjacent nanoapertures.

Author information

  • 1Department of Chemistry, Indiana University, Bloomington, Indiana 47405, USA.


Optical nonlinear properties of cusps formed at the junction between two circular apertures in a metal film have been studied by scanning confocal microscopy. For gold, both second harmonic and broadband emission are enhanced when the pump polarization is directed across the gap between cusps, similar to the behavior of the recently studied bowtie antennas and apertures. However, field enhancements are also present when the polarization is perpendicular to the gap direction. A quantitative explanation of the observed relative signal intensities requires considering both field concentration near cusps and shape resonances of the entire structure. The occurrence of broadband emission from the cusp region when Al is used instead of Au indicates that broadband emission is the result of additional mechanisms besides pure two-photon luminescence.

PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Chemical Society
    Loading ...
    Write to the Help Desk