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(Color online) (a) Experimental time-domain signals of terahertz pulses transmitted through thick random Ga microparticle ensembles measured at various temperatures. The dashed line indicates the arrival time of the peak of the terahertz pulse. We show the (b) effective real refractive index change and (c) effective imaginary refractive index change vs temperature and frequency. and are measured relative to the reference pulse transmitted through the sample at .
Experimental (a) and (b) for (empty circles) and (filled circles) at various temperatures. Striking discontinuity in occurs at the Ga melting temperature .
(a) Size distribution of the Ga microparticles before melting (light bars) and after melting (dark bars). (b) shows the maximum correlation amplitude of transmitted pulses at various temperatures relative to the reference pulse at . Insets are scanning electron microscope images of (i) the Ga microparticles prior to the heating cycle and (ii) the solidified particles after the heating cycle.
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