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Studies of the Dielectric Constant of Thin Film Bismuth Nanowire Samples Using Optical Reectometry

Published online by Cambridge University Press:  17 March 2011

M. R. Blacka ,
Y.-M. Lin ,
S. B. Cronin ,
O. Rabin ,
M. P adi  and
M. S. Dresselhaus
M. R. Blacka
Affiliation:
Department of EEC, assachusetts nstitute of ec hnology, Cambridge, MA Electronic mail: mrb@mgm.mit.edu
Y.-M. Lin
Affiliation:
Department of EEC, assachusetts nstitute of ec hnology, Cambridge, MA
S. B. Cronin
Affiliation:
Department of hysics, assach usetts nstitute of echnology, Cambridge, MA
O. Rabin
Affiliation:
Department of Chemistry, assach usetts nstitute of echnology, Cambridge, MA
M. P adi
Affiliation:
Department of hysics, assach usetts nstitute of echnology, Cambridge, MA
M. S. Dresselhaus
Affiliation:
Department of EEC, assachusetts nstitute of ec hnology, Cambridge, MA Department of hysics, assach usetts nstitute of echnology, Cambridge, MA Currently on leave from MIT
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Abstract

Arrays of 10 to 120 nm diameter single crystalline bismuth nanowires havebeen formed inside amorphous alumina templates. ince bismuth has a small e ective mass compared to other materials, signi cant quantum mechanical con nement is expected to occur in wires with diameter less than 50nm. he subbands formed b yquantum con nement cause in teresting modi cations to the dielectric function of bismuth. his study measures the dielectric function of bismuth nanowires in an energy range where the e ects of quantum con nement are predicted (0.05 to 0.5e). Using F ourier transforminfrared re ectometry, the dielectric constant as a function of energy is obtained for the alumina/bismuth composite system. E ective medium theory is used to subtract the e ect of the alumina template from the measurement of the composite material, thus yielding the dielectric function of bismuth nanowires. A strong absorption peak is observed at ∼1000cm−1 in the frequency dependent dielectric function in the photon energy range measured. he dependence of the frequency and intensity of this oscillator on incident light polarization and wire diameter are reviewed. n addition, the dependence of the optical absorption on antimony and tellurium doping of the nanowires are reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 635: Symposium C – Anisotropic Nanoparticles-Synthesis, Characterization & Applications , 2001 , C4.32
Copyright
Copyright © Materials Research Society 2001

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