We describe time-domain studies of terahertz (THz) pulse propagation in random bimetallic media composed of Au-coated Cu microparticles. Despite the similar electrical properties of Cu and Au, coating the Cu microparticles with Au nanolayers increases the effective resistivity of the particles by up to two orders of magnitude, resulting in large attenuation and phase modulation of the transmitted THz pulses. The experimental results are in reasonable agreement with simulations based on a damped harmonic oscillator.
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Chau et al. (2006) studied this question.
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