IMMERSION-TYPE TRANSMISSION ELLIPSOMETRY OF VERY THIN METAL FILMS

Resume- Une couche mince de metal e s t deposee sur la face l a plus longue d 'unprisme rectangulaire d ' indice no. Cette couche e s t recouverte par u n film mince transparent de liquide du m$me indice nQ, puis e s t prise en "sandwich " en plaqant par-dessus u n autre prisme identique au premier. On determine ainsi l e rapport des amplitudes complexes transmises, en polari-sation p e t s, par l e film qui e s t ainsi "suspendu " dans u n milieu uniforme d'indice no, ce qui permet d'evaluer les constantes optiques de ce film. Abstract- The metal film i s deposited on the longer face of a rectangular prism of index no. The film i s covered by a thin, transparent liquid film of index no, and i s sandwiched by placing another, identical prism on top of i t. The ra t io in complex amplitude transmissivity for the p- and s-polarized l igh t of the film t h u s optically "suspended " in a uniform medium of index no i s determined, from which the optical constants of the film are evaluated