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Hole shape effect induced optical response to permittivity change in palladium sub-wavelength hole arrays upon hydrogen exposure
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10.1063/1.3703664
/content/aip/journal/jap/111/8/10.1063/1.3703664
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/8/10.1063/1.3703664
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Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic of Pd sub-wavelength hole array on the Si substrate. (b) Scanning electron microscope images of the fabricated hole arrays having hole dimensions of (800, 800), (800, 500), and (800, 300). Palladium layer thickness is 100 nm.

Image of FIG. 2.
FIG. 2.

(a) Simulated and (b) measured transmittance spectra as a function of hole size of six sub-wavelength hole arrays. Palladium layer thickness was fixed to 100 nm. Transmittances of all spectra were normalized by their respective hole areas.

Image of FIG. 3.
FIG. 3.

Normalized |Ex| field distribution of (800, 600) and (800, 300) hole arrays at wavelength corresponding to peaks of transmittance spectra.

Image of FIG. 4.
FIG. 4.

(a) Normalized transmittivity of (800, 600) and (800, 300) hole arrays. (b) Imaginary part of the propagation constant of (800, 600) and (800, 300) hole arrays at Pd/Air and Pd/Si interfaces. λPd/Air and λPd/Si indicate cut-off wavelengths at each interface.

Image of FIG. 5.
FIG. 5.

Spectrum peak position and border wavelength at the Pd/Air interface as a function of size parameter of Pd sub-wavelength hole arrays.

Image of FIG. 6.
FIG. 6.

(a) Observed variation of the (800, 300) hole array transmittance spectrum upon hydrogen exposure. (b) Simulated variation of the (800, 300) hole array transmittance spectrum induced by Pd permittivity change. (c) Variation of the imaginary part of the propagation constant as a function of Pd permittivity.

Image of FIG. 7.
FIG. 7.

Peak shift value upon 2% H2 exposure as a function of size parameter length of Pd sub-wavelength hole arrays.

Image of FIG. 8.
FIG. 8.

Normalized |Ex| field distribution of (800, 300) hole array at wavelengths corresponding to main transmittance peaks for Pd layer thicknesses of 200 and 50 nm.

Image of FIG. 9.
FIG. 9.

Observed peak shift values upon 2% H2 exposure as a function of Pd layer thickness for (800, 800), (800, 500), (800, 400), and (800, 300) hole arrays.

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/content/aip/journal/jap/111/8/10.1063/1.3703664
2012-04-16
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hole shape effect induced optical response to permittivity change in palladium sub-wavelength hole arrays upon hydrogen exposure
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/8/10.1063/1.3703664
10.1063/1.3703664
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