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Materials 2015, 8(8), 5028-5047; doi:10.3390/ma8085028

Nanoimprinted Hybrid Metal-Semiconductor Plasmonic Multilayers with Controlled Surface Nano Architecture for Applications in NIR Detectors

College of Optical Sciences, the University of Arizona, Tucson 85721, AZ, USA
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Author to whom correspondence should be addressed.
Academic Editor: Gururaj V. Naik
Received: 23 June 2015 / Revised: 27 June 2015 / Accepted: 31 July 2015 / Published: 7 August 2015
(This article belongs to the Special Issue Plasmonic Materials)
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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. View Full-Text
Keywords: surface plasmon; metal semiconductor interface; silicon; photodetectors; infrared surface plasmon; metal semiconductor interface; silicon; photodetectors; infrared
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Khosroabadi, A.A.; Gangopadhyay, P.; Hernandez, S.; Kim, K.; Peyghambarian, N.; Norwood, R.A. Nanoimprinted Hybrid Metal-Semiconductor Plasmonic Multilayers with Controlled Surface Nano Architecture for Applications in NIR Detectors. Materials 2015, 8, 5028-5047.

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