Patent ID: 8879071
Filing Date: 2014-11-04
Classification: G01B,G01N,H01L

Abstract:
1. A method for developing and evaluating semiconductor devices or wafers for manufacture by optical interferometric testing and displaying internal stresses of semiconductor devices or wafers and for testing semiconductor devices or wafers while being manufactured, the device or wafer under test being comprised a semiconductor conductor material having an interior surface and interior structures, comprising: using a holographic optical interference system with at least one light source, providing at least one light beam of coherent wavelength with a wavelength to which the semiconductor material is at least semi-transparent or transparent, splitting the light beam into a pair of beams, comprising a reference beam and an object beam, imposing and adjusting the polarization of the object beam on the exterior surface of the semiconductor material to generate a reflected object beam reflected having a polarization from the interior structures of the semiconductor material and interior surfaces of the semiconductor material to generate a reflected polarized beam reflected from the interior structures of the semiconductor material, adjusting at least one of the following attributes of the angle of incidence or polarization or the length of the converging or diverging optical pathway of the reference beam relative to the object beam between one or more angles with the semiconductor material being in one or more states for each angle of the reference beam, or adjusting at least one of said attributes of the object beam relative to the reference beam, imposing the reflected object beam and the reference beam onto one or more detection devices to create a plurality of interference or interferometric patterns of the reflected object beam with the reflected reference beam, one interference or interferometric pattern at each of the plurality of angles of the reference beam, varying the magnification or optical pathway of the reference beam relative to the magnification of the object beam, using one or more detection devices to physically record or digitally store the plurality of interference or interferometric patterns of one or more infrared or thermal wavelengths, comparing the plurality of interference or interferometric patterns to one another to determine and display stress or the effects of such stress and interior structure characteristics within the semiconductor material, device or wafer, and using the plurality of interference or interferometric patterns comprising of the interference of one or more differing infrared or thermal wavelengths to perform at least one of the following: