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Proceedings Paper

Hydrogen absorption effects on the transmittance of sub-wavelength palladium hole arrays with different thicknesses
Author(s): Etsuo Maeda; Sho Mikuriya; Ichiro Yamada; Jean-Jacques Delaunay
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Paper Abstract

The far-field extraordinary optical transmission (EOT) of palladium (Pd) sub-wavelength hole arrays in the infrared region is used to detect hydrogen near the lower flammability threshold in air. Upon exposure to hydrogen, the Pd layer of the hole array expands, causing changes in the hole structure, and the Pd permittivity decreases. These two effects shift the main EOT transmittance peak of the Pd hole array to longer wavelengths. In this report, the effect of the Pd layer thickness on the redshift is analyzed by the rigorous coupled wave analysis technique and experimental observation. Our computational and experimental results show that the hole structural effect on the peak shift is dominant in the opaque region of the Pd layer transmission, whereas the Pd permittivity effect is dominant in the semi-transparent region. The optimum Pd layer thickness for hydrogen sensing is found to be at the boundary between the semi-transparent and the opaque regions of the Pd layer.

Paper Details

Date Published: 8 February 2011
PDF: 6 pages
Proc. SPIE 7941, Integrated Optics: Devices, Materials, and Technologies XV, 79410O (8 February 2011); doi: 10.1117/12.874027
Show Author Affiliations
Etsuo Maeda, The Univ. of Tokyo (Japan)
Sho Mikuriya, The Univ. of Tokyo (Japan)
Ichiro Yamada, The Univ. of Tokyo (Japan)
Jean-Jacques Delaunay, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 7941:
Integrated Optics: Devices, Materials, and Technologies XV
Jean Emmanuel Broquin; Gualtiero Nunzi Conti, Editor(s)

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