Characterization of the silver nanoparticles embedded in PVA matrix. (a) Transmission electron microscope image of the nanoparticles and (b) their statistical size distribution. (c) UV-visible absorption spectra of the Ag-PVA and (d) the PVA films.
(a) Time domain terahertz pulse with and without the Ag-PVA film, (b) , and (c) . Continuous lines in (b) and (c) are the fits using Eq. (3) with fitting parameters given in Table I. The locations of the confined acoustic phonons of silver nanoparticles at 0.6 and 2.12 THz are marked by vertical arrows . The broad peak at 1.11 THz corresponds to the LAM of crystalline lamellae in the PVA film. The insets of (b) for and (c) for show the results for a pristine PVA film (Ref. 27).
Parameters obtained from fitting Eq. (3) with the experimentally obtained values of dielectric function for the Ag-PVA film of thickness .
Frequencies in terahertz as a function of the mode index, of the IR active spheroidal , and toroidal , and acoustic modes for a silver nanoparticle with diameter 3.7 nm. The calculations are followed from Refs. 24–26.
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