title: Observation of focal point shift in solid immersion mirror.
abstract: Focal point shift in a solid immersion mirror of a high numerical-aperture is experimentally demonstrated with a scanning near-field optical microscope. The solid immersion mirror focuses light by a two-dimensional parabolic reflective surface integrated in a planar waveguide. The focal point shifts inward along the optical axis for metallized surface. The amount of shift from its geometrical node depends on the wavelength of the incident light and is determined to be roughly one-fifth of the wavelength.
authors.forename: Chubing
authors.initials: C
authors.lastname: Peng