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. 2014 Jul 16;4:5706. doi: 10.1038/srep05706

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(A) FTIR transmission spectrum of the diluted (α(∞) = 0.8%) ferrofluid in zero magnetic field reveals strong kerosene absorption lines. (B) Measured differential FTIR transmission spectrum T(H)-T(0) indicate a decrease in absorption line amplitude, which is consistent with the decrease of the kerosene radiation lifetime in the hyperbolic metamaterial state. (C) FTIR reflection spectrum of the ferrofluid in zero magnetic field. (D) Measured differential FTIR reflection spectrum R(H)-R(0) indicates reduced reflectivity in the hyperbolic state. (E) Reflectivity maxima in Fig. 5D plotted as a function of free space light wavelength show evidence of Bragg-like scattering of large k-vector hyperbolic metamaterial modes.