Hyperbolic and plasmonic properties of silicon/Ag aligned nanowire arrays

The hyperbolic and plasmonic properties of silicon nanowire/Ag arrays have been investigated. The aligned nanowire arrays were formed and coated by atomic layer deposition of Ag, which itself is a metamaterial due to its unique mosaic film structure. The theoretical and numerical studies suggest tha...

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Bibliographic Details
Published in:Optics express 2013-06, Vol.21 (12), p.14962-14974
Main Authors: Prokes, S M, Glembocki, Orest J, Livenere, J E, Tumkur, T U, Kitur, J K, Zhu, G, Wells, B, Podolskiy, V A, Noginov, M A
Format: Article
Language:English
Subjects:
Computer Simulation
Light
Materials Testing
Metal Nanoparticles - chemistry
Metal Nanoparticles - radiation effects
Models, Chemical
Refractometry - methods
Scattering, Radiation
Silicon - chemistry
Silicon - radiation effects
Silver - chemistry
Silver - radiation effects
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Summary:The hyperbolic and plasmonic properties of silicon nanowire/Ag arrays have been investigated. The aligned nanowire arrays were formed and coated by atomic layer deposition of Ag, which itself is a metamaterial due to its unique mosaic film structure. The theoretical and numerical studies suggest that the fabricated arrays have hyperbolic dispersion in the visible and IR ranges of the spectrum. The theoretical predictions have been indirectly confirmed by polarized reflection spectra, showing reduction of the reflection in p polarization in comparison to that in s polarization. Studies of dye emission on top of Si/Ag nanowire arrays show strong emission quenching and shortening of dye emission kinetics. This behavior is also consistent with the predictions for hyperbolic media. The measured SERS signals were enhanced by almost an order of magnitude for closely packed and aligned nanowires, compared to random nanowire composites. These results agree with electric field simulations of these array structures.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.21.014962