Patent ID: 7969555
Filing Date: 2011-06-28
Classification: B82Y,G02B,G03B,G03F

Abstract:
1. A lens structure comprising: a lens that has a substantially semispherical shape and includes a protruding portion having an exposing flat surface provided on its aspherical surface; a thin metal film that is formed on the exposing surface of the protruding portion, and has an aperture formed at a position corresponding to the center of the exposing surface of the protruding portion; and an immersion layer that is formed with a constant thickness on the surface of the protruding portion formed on the thin metal film, wherein the thin metal film is formed on a portion of the flat surface of the protruding portion so as to be opened a center portion of the flat surface of the protruding portion and to generate an evanescent field through the aperture.