Spectroscopic ellipsometry on metal and metal-oxide multilayer hybrid plasmonic nanostructures

Akram A. Khosroabadi, Palash Gangopadhyay, Byron Cocilovo, Laszlo Makai, Peter Basa, Binh Duong, Jayan Thomas, Robert A. Norwood

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The effective medium approximation is used to determine the optical constants of novel silver (Ag)/indium-tin oxide (ITO) multilayer nanopillar structures within the 300-800 nm wavelength range. The structures are modeled as inclusions in air with the pillar volume fraction at 42.4%, agreeing with SEM images of the sample. The simulated reflection intensity of the nanopillars is much less than that of the planar reference sample and is a result of the small difference between the refractive index of the top effective medium layer and that of air. Furthermore, the minimum in the reflection at around 450 nm in the nanostructured sample is evidence of surface plasmon enhancement, indicating suitability for plasmonic applications. The simulated Brewster angle decreases in the pillar region, which is an indication of smaller effective refractive index.

Original languageEnglish (US)
Pages (from-to)3969-3972
Number of pages4
JournalOptics letters
Volume38
Issue number19
DOIs
StatePublished - Oct 1 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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