Light-transmitting metal electrode having hyperfine structure and process for preparation thereof

A light-transmitting metal electrode comprising:

• a transparent substrate, and
• a metal electrode layer having a thickness in the range of not less than 10 nm and not more than 200 nm formed on said substrate, the metal electrode layer comprising:
• a metal part for which any pair of point-positions in the part is continuously connected, and
• a plurality of openings penetrating through said metal electrode layer, having an average diameter in the range of not less than 10 nm and not more than ⅓ of a wavelength of light, the pitches between the centers of said openings being not less than the average diameter and not more than ½ of said wavelength of light,
• wherein said openings are randomly arranged in said metal electrode layer, 90% or more of said metal part in said metal electrode layer continues linearly without breaks by the openings in a straight length between the adjoining openings of not more than ⅓ of the wavelength of light, and
• the resistivity of the metal electrode is equal to or less than 50 μΩcm.