title: Direct observation of low frequency confined acoustic phonons in silver nanoparticles: Terahertz time domain spectroscopy.
abstract: 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 0.1-2.5 THz. The real and imaginary parts of the dielectric function show two bands at 0.60 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.
authors.affiliation: Department of Physics, Indian Institute of Science, Bangalore 560012, India.
authors.forename: Sunil
authors.initials: S
authors.lastname: Kumar
authors.forename: N
authors.initials: N
authors.lastname: Kamaraju
authors.forename: B
authors.initials: B
authors.lastname: Karthikeyan
authors.forename: M
authors.initials: M
authors.lastname: Tondusson
authors.forename: E
authors.initials: E
authors.lastname: Freysz
authors.forename: A K
authors.initials: AK
authors.lastname: Sood