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Plasmonics

, Volume 14, Issue 1, pp 205–218 | Cite as

Investigation of Broadband Surface Plasmon Resonance of Dewetted Au Structures on TiO2 by Aperture-Probe SNOM and FDTD Simulations

  • J. Abed
  • F. Alexander
  • I. Taha
  • N. Rajput
  • C. Aubry
  • M. JouiadEmail author
Article
  • 150 Downloads

Abstract

The surface plasmon resonance of dewetted Au structures on TiO2 substrate using physical vapor deposition and post-annealing is investigated. In this work, we employ an aperture-probe scanning near-field optical microscope (SNOM) to study the plasmonic properties of dewetted Au structures and the influence of the size, shape, and interdistance of the dewetted structures on their plasmonic behavior. This investigation is corroborated by numerical calculations performed using finite-difference time-domain (FDTD) and atomic force microscopy (AFM) to provide a realistic and direct comparison with SNOM experiments. The near-field images obtained by both experiments and simulations reveal surface plasmon resonance around Au structures which are correlated to the broadband activity in the visible light region observed by UV-Vis spectrophotometry and photoluminescence. In addition, near-field enhancement is associated with the external quantum efficiency (EQE), which shows a multi-peak response after 570 nm due higher-order modes of plasmon resonance. This broadband improvement in the visible region obtained by controlled dewetting has potential use in large-scale solar energy applications.

Graphical Abstract

Keywords

Plasmonics Au structures SNOM FDTD simulations 

Notes

Acknowledgments

This work was carried out using the state-of-the-art clean room and electron microscopy facilities of Masdar Institute of Science and Technology. The authors would like to thank Prof. Kim Sang-Gook (MIT-USA) for the fruitful discussions and Hitesh Mamgain, WITec™ for the valuable hints on SNOM experiments.

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Authors and Affiliations

  1. 1.Department of Mechanical and Materials EngineeringMasdar Institute of Science and Technology - Khalifa UniversityAbu DhabiUnited Arab Emirates

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