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(a) Illustration of the single-band THz all-silicon metamaterial absorber and the inset plot shows the unit cell geometry of the design. (b) Measured absorption spectra of the single-band THz all-silicon metamaterial absorber for 0.05– 4 ppm of 2, 4-D. (c) Regression curves established for the single-band THz all-silicon metamaterial absorber based on spectral intensity variations .
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