Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 2, 2007
|
|
---|---|---|
Article Number | 07009 | |
Number of page(s) | 4 | |
DOI | https://doi.org/10.2971/jeos.2007.07009 | |
Published online | 13 March 2007 |
Regular papers
Enhanced transmission through arrays of subwavelength holes in gold films coated by a finite dielectric layer
1
MIC – Department of Micro and Nanotechnology, NanoDTU, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
2
Laboratory of Optics, Photonics and Quantum Electronics, Department of Microelectronics and Applied Physics, Royal Institute of Technology (KTH), Electrum 229, 16440 Kista, Sweden
* sanshui.xiao@mic.dtu.dk
** nam@mic.dtu.dk
Received:
16
February
2007
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.
Key words: transmission / surface plasmon / sensor
© The Author(s) 2007. All rights reserved.
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