Array of subwavelength rectangular structures in palladium for optical hydrogen detection

Etsuo Maeda; Takanori Matsuki; Ichiro Yamada; Jean-Jacques Delaunay

doi:10.1117/12.907509

27 February 2012 Array of subwavelength rectangular structures in palladium for optical hydrogen detection

Etsuo Maeda, Takanori Matsuki, Ichiro Yamada, Jean-Jacques Delaunay

Proceedings Volume 8264, Integrated Optics: Devices, Materials, and Technologies XVI; 82640N (2012) https://doi.org/10.1117/12.907509
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

A computational study of the far field transmittance of subwavelength palladium (Pd) structures is presented with a view of improving optical detection of hydrogen (H₂) with subwavelength structures. In previous reports, the optical responses of the far field transmittance spectra with subwavelength hole arrays were used to detect Pd hydride which are formed upon hydrogen exposure. Upon hydride formation, the wavelength of the main transmittance peak of the subwavelength Pd hole arrays showed a shift to longer wavelengths. In this report, the simulated optical response of transmittance spectra upon H₂ exposure with the subwavelength Pd hole array and rod array were compared. Our computational studies show that the dip wavelength of rod arrays have larger shifts than that of the peak wavelength of hole arrays upon H₂ exposure. The reason of the large optical response of the rod arrays lies in the effect of the expansion of the Pd layer upon H₂ exposure that results in larger shift to longer wavelengths for the rod arrays. The rod arrays offer potential advantages to increase the optical response to H₂ exposure of Pd subwavelength structures.

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Etsuo Maeda, Takanori Matsuki, Ichiro Yamada, and Jean-Jacques Delaunay "Array of subwavelength rectangular structures in palladium for optical hydrogen detection", Proc. SPIE 8264, Integrated Optics: Devices, Materials, and Technologies XVI, 82640N (27 February 2012); https://doi.org/10.1117/12.907509

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KEYWORDS

Palladium

Transmittance

Hydrogen

Silicon

Optical simulations

Surface plasmon polaritons

Absorption

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