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| split-ring resonator | |
|---|---|
| Name | Split-ring resonator |
| Caption | Schematic of a split-ring resonator element |
| Type | Metamaterial element |
| Invented | 1990s |
| Inventor | Pendry group |
| Used in | Metamaterials, antennas, cloaking |
split-ring resonator
A split-ring resonator is a subwavelength resonant electromagnetic element used in metamaterials and resonant circuits; it was demonstrated in the 1990s by researchers associated with Imperial College London, John Pendry, David Smith, Sir Julian Makle? and groups at Duke University and MIT to achieve negative permeability and negative refractive index phenomena linked to earlier theoretical work at Bell Labs and experimental pursuits at Los Alamos National Laboratory and Naval Research Laboratory. The concept connects to developments in plasmonics, photonic crystals, near-field optics, and devices studied at Stanford University, Harvard University, Caltech, and University of California, Berkeley. Split-ring resonators underpin engineered responses in systems explored by teams at NATO-sponsored conferences, IEEE, Optica (society), and laboratories funded by agencies such as the National Science Foundation and Defense Advanced Research Projects Agency.
Design considerations for split-ring resonators include ring radius, track width, gap size, and multi-turn architectures that echo practices in microwave engineering at RCA Laboratories, Philips Research Labs, General Electric Research Lab, Hughes Research Laboratories, and fabrication techniques from IBM Research and Siemens. Common geometries include single split rings, concentric split rings, and complementary split-ring designs inspired by patterns used in Bell Telephone Laboratories and in lithography programs at Tokyo Institute of Technology and EPFL. Arrays and lattices of split rings often adopt periodicities related to layouts used in Bell Labs-era antenna arrays, with unit-cell symmetry considerations paralleling analyses from Cambridge University and Oxford University groups.
The electromagnetic response of split-ring resonators is modeled using circuit analogies and full-wave simulations developed at Imperial College London, MIT, University of Pennsylvania, Max Planck Institute for the Science of Light, and NIST; these approaches combine inductive and capacitive elements in ways similar to resonant studies at Los Alamos National Laboratory and theoretical frameworks from Cambridge University and Harvard University. Resonant modes produce magnetic dipole moments and effective permeability described in papers published in journals from American Physical Society, Nature Publishing Group, Science (journal), and IEEE Transactions on Antennas and Propagation, and the theory ties to dispersion analysis used by researchers at Columbia University and Yale University.
Fabrication methods for split-ring resonators range from printed circuit board techniques used by Rohde & Schwarz and Keysight Technologies to electron-beam lithography protocols developed at IBM Research, Hitachi, JEOL, and microfabrication facilities at National Institute of Standards and Technology and university cleanrooms including MIT Nanotechnology Laboratory and Cornell NanoScale Science and Technology Facility. Materials include copper, gold, silver, aluminum, high-index dielectrics from suppliers linked to BASF, 3M, and thin-film layers produced by groups at Lawrence Berkeley National Laboratory and SLAC National Accelerator Laboratory. Advanced substrates and flexible implementations draw on collaborations with DuPont, Sumitomo Chemical, and polymer research at Max Planck Institute for Polymer Research.
Split-ring resonators are applied in negative-index metamaterials exploited in experiments at Duke University, University of California, San Diego, University of Texas at Austin, and Northwestern University; they enable compact antennas used by NASA, European Space Agency, Airbus, and Boeing and frequency-selective surfaces integrated into systems developed at Raytheon, Lockheed Martin, and BAE Systems. Other applications include sensors and biosensing platforms inspired by work at Scripps Research, Johns Hopkins University, and University College London; cloaking and transformation-optics demonstrations led by teams at Imperial College London, Duke University, and KTH Royal Institute of Technology; and terahertz devices researched at University of Cambridge, Riken, and Tohoku University.
Variants include complementary split-ring resonators (CSRRs), multi-gap rings, fractal rings, and chiral split-ring assemblies studied at ETH Zurich, Kiel University, Wuhan University, and Tsinghua University; related structures encompass electric-LC resonators, fishnet metamaterials, helical resonators, and planar resonators investigated at Seoul National University, Peking University, KAIST, and Nanyang Technological University. Hybrid designs combine split rings with graphene, transition metal dichalcogenides (studied at Rice University and University of Illinois Urbana-Champaign), and superconducting films researched at University of Twente and University of Geneva.
Characterization techniques employed include network analysis, S-parameter retrieval, terahertz time-domain spectroscopy, near-field scanning microscopy, and scanning electron microscopy executed at facilities like NIST, Argonne National Laboratory, Brookhaven National Laboratory, and university labs at Princeton University and Rutgers University. Data analysis and parameter extraction protocols follow standards in publications by IEEE, APS, Optica (society), and computational modeling using software from ANSYS, COMSOL, and groups affiliated with Wolfram Research.
Category:Metamaterials