Applied Physics Letters · 2007 · 297 citations · 15 references
Natural SciencesMaterials EngineeringMaterials ScienceBiosensorsSensorsSurface ScienceChemical SensorsDielectricsSensor MaterialsTerahertz PhotonicsTerahertz SpectroscopyDielectric ConstantDielectric LoadingFree-field RadiationFrequency-selective SurfacesNumerical Device SimulationNumerical SimulationProbe DetectionTerahertz Detection
The study presents an approach for sensing minute quantities of chemical and biochemical materials. The method uses a frequency‑selective surface of asymmetric split‑ring resonators excited by free‑space radiation, producing a steep‑flanked resonance that shifts with dielectric loading. Numerical simulations confirm that selective loading creates strong E‑field concentration, enabling detection of very small probe amounts and guiding structure optimization.
An apporach for the sensing of small amounts of chemical and biochemical material is presented. A frequency selective surface made from asymmetric split ring resonators is excited with free space radiation. Due to interference effects a resonance occurs with a steep flank in the frequency response which is shifted upon dielectric loading. Utilizing a strong E-field concentration by selective loading the detection of very small amounts of probe material becomes possible. The functionality is proven by numerical simulation and the optimization of structure and loading is performed.
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M. Nagel, P. Haring Bolívar, M. Brucherseifer et al. · Applied Physics Letters · 2002 · 543 citations
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Natural Sciences, Chemistry, Physics +17