Optical recording medium and optical recording and reading method using the same

摘要

An optical recording medium has a substrate and a recording layer formed thereon, the recording layer containing at least one squarylium compound and one azo metal chelate compound including an azo moiety of formula (I-1) or (I-2) and a metal: wherein A, B, A', and X are the same as those previously defined in the specification. Writing and reading steps are performed by the application of a semiconductor laser beam with a wavelength in a range from 600 to 720 nm.