The complex refractive index of metal has significant effects on plasmon waveguide performance. We measured the complex refractive index of gold in the terahertz frequency range using terahertz time-domain spectroscopy (THz-TDS). The measured refractive index is relatively close to that obtained from Kramers–Kronig analysis of the surface resistance of gold.
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Yasuda et al. (2008) studied this question.
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