Electric and magnetic resonances in arrays of coupled gold nanoparticle in-tandem pairs

Year: 2008

Authors: Ekinci Y., Christ A., Agio M., Martin OJF., Solak HH., Ltzffler JF.

Autors Affiliation: ETH, Lab Met Phys & Technol, Dept Mat, CH-8093 Zurich, Switzerland; Ecole Polytech Fed Lausanne, Nanophoton & Metrol Lab, CH-1015 Lausanne, Switzerland; ETH, Phys Chem Lab, CH-8093 Zurich, Switzerland; Paul Scherrer Inst, Lab Micro & Nanotechnol, CH-5232 Villigen, Switzerland.

Abstract: We present an experimental and theoretical study on the optical properties of arrays of gold nanoparticle in-tandem pairs (nanosandwiches). The well-ordered Au pairs with diameters down to 35 nm and separation distances down to 10 nm were fabricated using extreme ultraviolet (EUV) interference lithography. The strong near-field coupling of the nanoparticles leads to electric and magnetic resonances, which can be well reproduced by Finite- Difference Time- Domain (FDTD) calculations. The influence of the structural parameters, such as nanoparticle diameter and separation distance, on the hybridized modes is investigated. The energy and lifetimes of these modes are studied, providing valuable physical insight for the design of novel plasmonic structures and metamaterials.

Journal/Review: OPTICS EXPRESS

Volume: 16 (17)      Pages from: 13287  to: 13295

More Information: This work was supported by the ETH Zurich Initiative on Composite Doped Metamaterials (CDM) and by ETH Research Grant TH-29/07-3. MA thanks Vahid Sandoghdar for continuous support and encouragement. AC and OJFM gratefully acknowledge funding from the European Commission (contract Nr. IST FP6-202-IST-1-507879) and from the Swiss National Science Foundation (contract Nr. R’Equip 206021). Part of this work was performed at the Swiss Light Source (SLS), Paul Scherrer Institute, Switzerland.
KeyWords: Enhanced Raman-scattering; Interference Lithography; Optical-properties; Nanosandwiches; Spectroscopy; Particles
DOI: 10.1364/OE.16.013287

Citations: 56
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