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Plasmonics

, Volume 11, Issue 4, pp 1101–1107 | Cite as

Illumination Dependent Optical Properties of Plasmonic Nanorods Coupled to Thin-Film Cavities

Article

Abstract

The scattering spectra and intensity of gold nanorods placed at varied distances above gold films have been simulated and measured under various conditions, demonstrating that scattering characteristics of the nanorod-film system are highly dependent on illumination conditions. Studying the surrounding electric fields of nanorods reveals that the illumination-dependent properties of the system are induced by the interference in the nanorod-film system. Both simulations and experiments show that optimising the nanorod-film distance can greatly enhance scattering magnitudes up to ~20 times for certain illumination conditions. We propose an application of the studied system in facilitating photo-thermal conversion.

Keywords

Gold nanorod Thin-film Fabry-Perot cavity Illumination-dependence photo-thermal effect 

Notes

Acknowledgments

This work was financially supported by New Zealand’s Marsden Fund through contract UOO-1214, the Priming Partnership Pilot Funding (University of Otago), the National Natural Science Foundation of China (grants 61275030, 61205030, and 61235007), the Open Fund of State Key Laboratory of Advanced Optical Communication Systems and Networks, and the Swedish Foundation for Strategic Research (SSF) and the Swedish Research Council (VR).

Supplementary material

11468_2015_148_MOESM1_ESM.doc (836 kb)
Fig. S1 Scattering cross-section of AuNRs placed at d = 50 (black line), 100 (red line), 160 (blue line) and 200 nm (green line) under normal incidence (d), E y (e) and H x (f) illuminations. Top schematics show configurations for each illumination conditions. (DOC 835 kb)
11468_2015_148_MOESM2_ESM.doc (528 kb)
Fig. S2 schematic of the scattering measurement on single AuNRs above a Au substrate using reflection Dark-Field microscopy. The illumination shines on the sample with an incident angle from all azimuthal directions. (DOC 528 kb)
11468_2015_148_MOESM3_ESM.doc (1.1 mb)
Fig. S3 (a) simulated scattering cross-section of AuNRs placed at d = 50 (black line), 100 (red line), 160 (blue line) and 200 nm (green line) under unpolarized illumination with an incident angle θ = 53° and their normalizations (b). (c) Experimentally acquired scattering spectra of AuNRs (marked with red circles in the far-field scattering images) at d = 50 (black line), 100 (red line), 160 (blue line) and 200 nm (green line) using a dark-field microscope mentioned in Fig. S2 and their normalizations (d). Far-field scattering images (left) scanning electron microscope (SEM) images (right) for AuNRs at d = 50 (e), 100 (f), 160 (g) and 200 nm (h). The SEM images show the physical appearances of AuNRs marked by the red circles in each panel. (DOC 1085 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.State Key Laboratory of Modern Optical Instrumentation, Department of Optical EngineeringZhejiang UniversityHangzhouChina
  2. 2.School of Information and Communication TechnologyRoyal Institute of TechnologyKistaSweden
  3. 3.MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of PhysicsUniversity of OtagoDunedinNew Zealand

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