Patent ID: 8450688
Filing Date: 2013-05-28
Classification: G01N,H04N

Abstract:
1. A system for imaging subsurface features of a semiconductor object comprising a first region having a first doping property and a second region having a second doping property, the semiconductor object comprising subsurface features and material between a surface of the semiconductor object and the subsurface features, the material having an index of refraction that is greater than an index of refraction of a surrounding medium in contact with the surface of the semiconductor object, the system comprising: an imaging device comprising an objective, wherein the imaging device is sensitive to a first wavelength; an illumination source to emit illumination substantially at the first wavelength, wherein the illumination is directed towards the surface of the semiconductor object at a first angle relative to a normal of the surface, wherein the first angle is greater than an acceptance angle of the objective of the imaging device, and wherein the first wavelength has a photonic energy greater than a bandgap of the first region and less than a bandgap of the second region.