Far-Infrared Absorption of PbSe Nanorods

Measurements of the far-infrared absorption spectra of PbSe nanocrystals and nanorods are presented. As the aspect ratio of the nanorods increases, the Fröhlich sphere resonance splits into two peaks. We analyze this splitting with a classical electrostatic model, which is based on the dielectric f...

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Veröffentlicht in:	Nano letters 2011-07, Vol.11 (7), p.2786-2790
Hauptverfasser:	Hyun, Byung-Ryool, Bartnik, A. C, Koh, Weon-kyu, Agladze, N. I, Wrubel, J. P, Sievers, A. J, Murray, Christopher B, Wise, Frank W
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Dielectrics Electrostatics Exact sciences and technology Fullerenes and related materials Infrared and raman spectra and scattering Lead - chemistry Materials science Mathematical models Nanocrystalline materials Nanocrystals Nanorods Nanoscale materials and structures: fabrication and characterization Nanostructure Nanotechnology Nanotubes Nanotubes - chemistry Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Particle Size Physics Selenium Compounds - chemistry Spectra Spectrophotometry, Infrared Splitting Surface Properties Visible and ultraviolet spectra
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Zusammenfassung:	Measurements of the far-infrared absorption spectra of PbSe nanocrystals and nanorods are presented. As the aspect ratio of the nanorods increases, the Fröhlich sphere resonance splits into two peaks. We analyze this splitting with a classical electrostatic model, which is based on the dielectric function of bulk PbSe but without any free-carrier contribution. Good agreement between the measured and calculated spectra indicates that resonances in the local field factors underlie the measured spectra.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl201115h