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Optical hydrogen detection with periodic subwavelength palladium hole arrays
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Fabrication sequence of the Pd hole arrays and (b) field emission scanning electron microscopy images of the fabricated hole array having a period of and an aspect ratio of 1.6.

Image of FIG. 2.
FIG. 2.

(a) Measured transmittance spectra as a function of aspect ratio. (b) Observed variations in the transmittance spectrum of the hole array with an aspect ratio of 1.6 for a 2% exposure. All spectra were recorded with radiation polarized along the axis parallel to the width of the rectangles.

Image of FIG. 3.
FIG. 3.

(a) Comparison between the measured and simulated peak positions of the resonance Pd/Si (1,0) mode as a function of the aspect ratio of the rectangular holes. (b) Comparison between observed and simulated shifts of the (1,0) peak as a function of the aspect ratio for a 2% exposure. (c) Contributions to the resonance peak shift of the relative permittivity variation (20% decrease in absolute value of the real/imaginary parts) and of the lateral and vertical expansion (3.5%) of the Pd layer for a 2% exposure.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical hydrogen detection with periodic subwavelength palladium hole arrays