Abstract

Metal island films are composed of nanometer-size metal particles (i.e., islands) and they exhibit selective absorption in the visible-near infrared regions. Recently, we have proposed multifrequency 3-D optical readonly memory (ROM) disks using them.^1,2 As the recording layers consist of the metal films, the proposed 3-D disks are expected to have several advantages over the disks using organic materials^3,4 in stability against heat, light irradiation, and aging. However, as far as a pure metal is used, it is difficult to realize very large storage density, since one cannot efficiently control the optical properties of the island film. In this paper, we propose and demonstrate new metal island films, i.e., compound metal island (CMI) films, as purposive recording media of the 3-D disks. Optical properties of CMI films

© 1993 Optical Society of America