Patent ID: 8620132
Filing Date: 2013-12-31
Classification: B82Y,G01N,G02F

Abstract:
1. A terahertz scanning reflectometer for direct measurement of diffusion kinetics and concentration gradient of a substrate, comprising: a platform configured to hold the substrate; a continuous wave terahertz source configured to generate terahertz radiation; an off-axis parabolic reflector configured to focus the terahertz radiation at a surface of the substrate; a beam splitter configured to direct a reflected beam from the substrate to a detection system; and a motion controller configured to move the platform, wherein on a condition that the motion controller adjusts a location of a focal point inside the substrate, a reflectance measurement is performed across a thickness of the substrate, wherein a concentration gradient is determined from a blank substrate measurement and a substance loaded substrate measurement, and wherein on a condition that the motion controller locks the focal point at the surface of the substrate, a real time reflectance measurement is performable upon placement of the substance on the substrate.