Physics – Optics
Scientific paper
2007-03-08
J. Eur. Opt. Soc., Rapid Publ. 2, 07009 (2007).
Physics
Optics
11 pages including 4 figures. Accepted for JEOS:RP
Scientific paper
10.2971/jeos.2007.07009
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.
Mortensen Niels Asger
Qiu Min
Xiao Sanshui
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