Enhanced transmission through arrays of subwavelength holes in gold films coated by a finite dielectric layer

Sanshui Xiao, Niels Asger Mortensen, M. Qiu

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Enhanced transmissions through a gold film with arrays of subwavelength holes are theoretically studied, employing the rigid full vectorial three dimensional finite difference time domain method. Influence of air-holes shape to the transmission is firstly studied, which confirms two different resonances attributing to the enhanced transmission: the localized waveguide resonance and periodic surface plasmon resonances. For the film coated with dielectric layers, calculated results show that in the wavelength region of interest the localized waveguide resonant mode attributes to sensing rather than the periodic gold-glass surface plasmon mode. Although the detected peak is fairly broad and the shift is not too pronounced, we emphasize the contribution for sensing from the localized waveguide resonant mode, which may opens up new ways to design surface plasmon based sensors.
    Original languageEnglish
    JournalJournal of the European Optical Society - Rapid Publications
    Volume2
    Pages (from-to)07009
    ISSN1990-2573
    DOIs
    Publication statusPublished - 2007

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