Accession Number : AD0697812

Title :   INVESTIGATION OF THE INFLUENCE OF DEFECTS IN THIN METALLIC FILMS ON THEIR OPTICAL AND ELECTRICAL PROPERTIES.

Descriptive Note : Final technical rept.,

Corporate Author : INSTITUT D'OPTIQUE THEORETIQUE ET APPLIQUEE PARIS (FRANCE)

Personal Author(s) : Abeles,Florian ; Theye,M. L. ; Couzineau,M. M.

Report Date : OCT 1969

Pagination or Media Count : 29

Abstract : The influence of structural defects on the optical properties of thin vacuum-evaporated films of silver has been investigated. The technique of preparation and control of the annealing are described. The crystallographic structure of the films has been examined by transmission electron microscopy. The possibilities of further improving the structure of the films is discussed. The optical absorption is due to various mechanisms which were carefully separated: intraband and interband transitions and plasma oscillations. It was found that the optical mass mo of the conduction electrons is definitely smaller than unity (0.86 < or = mo < or = 0.89) for all the films, a result which is at variance with those already known. The optical relaxation time is always smaller than the relaxation time deduced from electrical d.c. resistivity measurements on the same film. It was found that there is no supplementary absorption band even in films containing a large amount of imperfections. This condition is quite different from the results obtained with Au. The absorption due to interband transition appears to be characteristic of the metal: it does not depend either on thickness or on the quality of the films. Likewise, the position of the peak of the energy loss function is insensitive to the quality of the films; but the width and intensity of the peak are correlated with the degree of imperfection of the specimens. Below the absorption edge, there is an absorption tail, which is roughly exponential and extends over a wide energy range (2 to 3.8 eV). (Author)

Descriptors :   (*METAL FILMS, *CRYSTAL DEFECTS), OPTICAL PROPERTIES, ELECTRICAL PROPERTIES, SILVER, ANNEALING, BAND THEORY OF SOLIDS, RELAXATION TIME, FRANCE

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE