Optical properties of metal nanoparticles embedded in amorphous silicon analysed using discrete dipole approximation

Alessandro Fantoni, Miguel Fernandes, Yuri Vygranenko, Manuela Vieira, Rui P. Oliveira-Silva, D. M. F. Prazeres, Ana P. C. Ribeiro, Elisabete C .B. A. Alegria

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Localized surface plasmons (LSP) can be excited in metal nanoparticles (NP) by UV, visible or NIR light and are described as coherent oscillation of conduction electrons. Taking advantage of the tunable optical properties of NPs, we propose the realization of a plasmonic structure, based on the LSP interaction of NP with an embedding matrix of amorphous silicon. This study is directed to define the characteristics of NP and substrate necessary to the development of a LSP proteomics sensor that, once provided immobilized antibodies on its surface, will screen the concentration of selected antigens through the determination of LSPR spectra and peaks of light absorption. Metals of interest for NP composition are: Aluminium and Gold. Recent advances in nanoparticle production techniques allow almost full control over shapes and size, permitting full control over their optical and plasmonic properties and, above all, over their responsive spectra. Analytical solution is only possible for simple NP geometries, therefore our analysis, is realized recurring to computer simulation using the Discrete Dipole Approximation method (DDA). In this work we use the free software DDSCAT to study the optical properties of metal nanoparticles embedded in an amorphous silicon matrix, as a function of size, shape, aspect-ratio and metal type. Experimental measurements realized with arrays of metal nanoparticles are compared with the simulations.

Original languageEnglish
Title of host publicationPhysics and Simulation of Optoelectronic Devices XXVI
EditorsB. Witzigmann, M. Osinski, Y. Arakawa
PublisherSPIE-International Society for Optical Engineering
ISBN (Electronic)9781510615373
DOIs
Publication statusPublished - 2018
EventPhysics and Simulation of Optoelectronic Devices XXVI 2018 - San Francisco, United States
Duration: 29 Jan 20181 Feb 2018

Publication series

NameProceedings of SPIE
PublisherSPIE-International Society for Optical Engineering
Volume10526
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhysics and Simulation of Optoelectronic Devices XXVI 2018
CountryUnited States
CitySan Francisco
Period29/01/181/02/18

Keywords

  • acronyms
  • amorphous silicon
  • Discrete Dipole Approximation method
  • Localized surface plasmons

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  • Cite this

    Fantoni, A., Fernandes, M., Vygranenko, Y., Vieira, M., Oliveira-Silva, R. P., Prazeres, D. M. F., ... Alegria, E. C. . B. A. (2018). Optical properties of metal nanoparticles embedded in amorphous silicon analysed using discrete dipole approximation. In B. Witzigmann, M. Osinski, & Y. Arakawa (Eds.), Physics and Simulation of Optoelectronic Devices XXVI [1052609] (Proceedings of SPIE; Vol. 10526). SPIE-International Society for Optical Engineering. https://doi.org/10.1117/12.2289983