Nanoimprinted hybrid metal-semiconductor plasmonic multilayers with controlled surface nano architecture for applications in NIR detectors

Akram A. Khosroabadi, Palash Gangopadhyay, Steven Hernandez, Kyungjo Kim, Nasser Peyghambarian, Robert A. Norwood

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We present a proof of concept for tunable plasmon resonance frequencies in a core shell nano-architectured hybrid metal-semiconductor multilayer structure, with Ag as the active shell and ITO as the dielectric modulation media. Our method relies on the collective change in the dielectric function within the metal semiconductor interface to control the surface. Here we report fabrication and optical spectroscopy studies of large-area, nanostructured, hybrid silver and indium tin oxide (ITO) structures, with feature sizes below 100 nm and a controlled surface architecture. The optical and electrical properties of these core shell electrodes, including the surface plasmon frequency, can be tuned by suitably changing the order and thickness of the dielectric layers. By varying the dimensions of the nanopillars, the surface plasmon wavelength of the nanopillar Ag can be tuned from 650 to 690 nm. Adding layers of ITO to the structure further shifts the resonance wavelength toward the IR region and, depending on the sequence and thickness of the layers within the structure, we show that such structures can be applied in sensing devices including enhancing silicon as a photodetection material.

Original languageEnglish (US)
Pages (from-to)5028-5047
Number of pages20
JournalMaterials
Volume8
Issue number8
DOIs
StatePublished - 2015

Keywords

  • Infrared
  • Metal semiconductor interface
  • Photodetectors
  • Silicon
  • Surface plasmon

ASJC Scopus subject areas

  • Materials Science(all)

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