Accession Number:

ADA595855

Title:

Hyperbolic and Plasmonic Properties of Silicon/Ag Aligned Nanowire Arrays

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC ELECTRONICS SCIENCE AND TECHNOLOGY DIV

Report Date:

2013-06-17

Pagination or Media Count:

14.0

Abstract:

The hyperbolic and plasmonic properties of silicon nanowireAg 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 SiAg 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.

Subject Categories:

  • Miscellaneous Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE