The longitudinal optical phonon‐plasmon interaction theory of Varga is shown to be applicable to Gadoped CdS through the region of the first reflectivity minumum (2.5 to about 30 μ). The theoretical reflectivity vs wavelength for several concentrations of Ga‐doped CdS are compared with experiment. The agreement between theory and experiment is particularly good for high dopant concentrations. A plot of the wavelength at minimum reflectivity vs impurity concentrations shows that the Varga theory does well in explaining the data. When phonon damping is introduced into the Varga dielectric function, the reflectivity over the whole region of resonance is more realistic. Finite plasmon lifetime is not considered since no data are available for CdS.
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January 1968
Research Article|
January 01 1968
Longitudinal Optical Phonon‐Plasmon Coupling in CdS
Robert J. Bell;
Robert J. Bell
Physics Department and Graduate Center for Materials Research, University of Missouri at Rolla, Rolla, Missouri
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Thomas J. McMahon;
Thomas J. McMahon
Physics Department, University of Missouri at Rolla, Rolla, Missouri
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Donald G. Rathbun
Donald G. Rathbun
Physics Department, University of Missouri at Rolla, Rolla, Missouri
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J. Appl. Phys. 39, 48–51 (1968)
Article history
Received:
June 06 1967
Citation
Robert J. Bell, Thomas J. McMahon, Donald G. Rathbun; Longitudinal Optical Phonon‐Plasmon Coupling in CdS. J. Appl. Phys. 1 January 1968; 39 (1): 48–51. https://doi.org/10.1063/1.1655776
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