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  • Title: Distinguishing octane grades in gasoline using terahertz metamaterials.
    Author: Li J, Tian Z, Chen Y, Cao W, Zeng Z.
    Journal: Appl Opt; 2012 Jun 01; 51(16):3258-62. PubMed ID: 22695558.
    Abstract:
    Distinguishing octane numbers of commercial gasoline is experimentally demonstrated by use of single split-ring resonator metamaterials functioning at terahertz frequencies. The differences in frequency-dependent absorption coefficients and refractive indices of various grades of gasoline lead to a modification in the surrounding dielectric environment and consequently the resonance properties of the planar metamaterials. This consequently enables a distinct frequency shift in the inductive-capacitive electric dipolar resonances. This paper reveals that such metamaterial arrays, as highly sensitive chemical sensors, have promising potential in petroleum industrial applications.
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