Fig. 1
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Investigated Ge nanoantennas: (a) representative scanning electron microscopy image; (b, c) intensity profile of the fundamental TE and TM modes, respectively, simulated employing the mode source in the FDTD Ansys Lumerical software; (d) dispersion relations (mode wavelength as a function of the free-space wavelength) for the fundamental TE and TM modes.
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