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(a) The design of the refractive index sensor based on silver G-shaped spiral metamaterial lying on top of a SiO2 substrate.The resonance wavelength of the metamaterialstructure would shift according to the refractive index of the liquid dropped on top of the sensor.
(b) The spectral shift induced by ambient refractive index increase from 1.0 to 1.5.
(c) The sensing sensitivity of the spectral interrogation working mode.
(d) The sensing sensitivity of the intensity interrogation working mode.
Opt Lett. 2013 ;38(16):3133-6.
Ren M, Pan C, Li Q, Cai W, Zhang X, Wu Q, Fan S, Xu J.
Abstract
We numerically investigate the optical properties of a spiral G-shaped metamaterial, which exhibits both a sharp resonance with a high-quality factor and a broad resonance with a long linear slope in the near-infrared region. By employing the sharp resonating mode, refractive index sensing with sensitivity up to 410 nm/RIU is demonstrated theoretically. In addition, the metamaterial shows single wavelength sensing ability, which allows fast determination of environmental refractive index changes as large as 0.5 by simply monitoring variations in the transmitted intensity of a certain wavelength, which will be beneficial to the development of refractive index sensors based on monochromatic light sources and detectors. As the resonances are independent of the polarization direction of a linearly polarized wave, the sensor manufacturing process will benefit as a result of the lack of an alignment requirement for the axis of polarizers with the metamaterials’ orientation.
