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Growth of silicon nanowires-based heterostructures and their plasmonic modeling

Published online by Cambridge University Press:  16 April 2013

Yuan Li ,
Wenwu Shi ,
John C. Dykes  and
Nitin Chopra
Yuan Li
Affiliation:
Metallurgical and Materials Engineering Department, Center for Materials for Information Technology (MINT), The University of Alabama, Tuscaloosa, AL 35487, U.S.A.
Wenwu Shi
Affiliation:
Metallurgical and Materials Engineering Department, Center for Materials for Information Technology (MINT), The University of Alabama, Tuscaloosa, AL 35487, U.S.A.
John C. Dykes
Affiliation:
REU, Department of Mathematics, The University of Alabama, Tuscaloosa, AL 35487, U.S.A
Nitin Chopra*
Affiliation:
Metallurgical and Materials Engineering Department, Center for Materials for Information Technology (MINT), The University of Alabama, Tuscaloosa, AL 35487, U.S.A. Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL 35487, U.S.A.
*
*Corresponding Author E mail: nchopra@eng.ua.edu, Tel: 205-348-4153, Fax: 205-348-2164
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Abstract

Complex nanoscale architectures based on gold nanoparticles (AuNPs) can result in spatially-resolved plasmonics. Herein, we demonstrate the growth of silicon nanowires (SiNWs), heterostructures of SiNWs decorated with AuNPs, and SiNWs decorated with graphene shells encapsulated gold nanoparticles (GNPs). The fabrication approach combined CVD growth of nanowires and graphene with direct nucleation of AuNPs. The plasmonic or optical properties of SiNWs and their complex heterostructures were simulated using discrete dipole approximation method. Extinction efficiency spectra peak for SiNW significantly red-shifted (from 512 nm to 597 nm or 674 nm) after decoration with AuNPs, irrespective of the incident wave vector. Finally, SiNW decorated with GNPs resulted in incident wave vector-dependent extinction efficiency peak. For this case, wave vector aligned with the nanowire axial direction showed a broad peak at ∼535 nm. However, significant scattering and no peak was observed when aligned in radial direction of the SiNWs. Such spatially-resolved and tunable plasmonic or optical properties of nanoscale heterostructures hold strong potential for optical sensor and devices.

Keywords

nanostructureoptical propertieschemical vapor deposition (CVD) (deposition)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1547: Symposium M – Solution Synthesis of Inorganic Functional Materials—Films, Nanoparticles and Nanocomposites , 2013 , pp. 103 - 108
Copyright
Copyright © Materials Research Society 2013 

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References

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