Sathya Sai Seetharaman, Ian R. Hooper, William L. Barnes

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Presentation transcript:

Exploring the interactions in systems of densely packed split-ring resonators Sathya Sai Seetharaman, Ian R. Hooper, William L. Barnes Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter CIMTEC 07-06-2016

Outline of Talk Motivation Dipole-Dipole coupling What is a split-ring resonator? Experimental details Experimental results Conclusions & future work

Motivation Interactions in a chain of densely packed split-ring resonators Study role of electric and magnetic interactions in a pair of SRRs as a function of separation and relative orientation Extend understanding to multiple coupled resonators

Nature of dipole coupling Transverse Longitudinal

Split-Ring Resonator (SRR) Induced charge difference Induced electric current Bianisotropy – exciting both electric and magnetic response via one of the field components Excited resonant mode depends on orientation with respect to the incident field

Experimental setup

Resonance of a single SRR 7 mm 1 mm 6.2 mm Outer diameter = 7 mm Inner diameter = 6.2 mm Split-gap width = 1 mm

Resonant modes in a SRR pair

Experiment 1 – No relative rotation Relative rotation – 0o

Computational Modelling

Experiment 2 – Splits on opposite sides Relative rotation – 180o

Experiment 3 – Magnetic coupling Relative rotation – 90o

Summary Explored interaction between two SRRs in a waveguide and studied the change in interaction as a function of separation and relative rotation Results verified by computational modelling Further work Develop analytical model Extend study to more than 2 resonators to study interactions between multiple coupled oscillators Summary - Confirmed nature of the resonant modes – with computational model

Thank you for your attention Acknowledgements We acknowledge financial support from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom, via the EPSRC Centre for Doctoral Training in Electromagnetic Metamaterials. Dr. Simon Horsley – CEMPS, University of Exeter Thank you for your attention