Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy

Details Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy

2010-10-12

arxiv.org/abs/1010.2339v1

J. Chem. Phys. 133, 014502 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 2 figures

Scientific paper

10.1063/1.3456372

Terahertz time domain spectroscopy has been used to study low frequency confined acoustic phonons of silver nanoparticles embedded in poly(vinyl alcohol) matrix in the spectral range of 0.1 to 2.5 THz. The real and imaginary parts of the dielectric function show two bands at 0.60 THz and 2.12 THz attributed to the spheroidal and toroidal modes of silver nanoparticles, thus demonstrating the usefulness of terahertz time domain spectroscopy as a complementary technique to Raman spectroscopy in characterizing the nanoparticles.

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