Patent ID: 8934607
Filing Date: 2015-01-13
Classification: G01B,G01N,H01L

Abstract:
1. A measuring apparatus comprising: a stage configured to support a substrate on which a periodic structure comprising a plurality of films is formed; a stage control unit configured to control the position and height of the stage; an electromagnetic wave applying unit configured to generate electromagnetic waves and applies the electromagnetic waves to the substrate; an angle control unit configured to control an elevation angle of the electromagnetic waves; a detecting unit configured to detect the electromagnetic waves scattered or reflected by an substrate and measure an intensity of the electromagnetic waves scattered or reflected by the substrate; a data processing unit configured to process a signal from the detecting unit to create a first scatter profile, fit the first scatter profile to a second scatter profile previously obtained by a simulation for the periodic structure, and thereby calculate a surface shape of the periodic structure; a film structure transforming unit configured to calculate a virtual film structure regarding a surface structure of the periodic structure from the calculated surface shape, and calculate the virtual film structure regarding an internal structure of the periodic structure from reference data regarding the periodic structure; and a film structure measuring unit configured to set measurement conditions from the virtual film structure, control the stage control unit, the electromagnetic wave applying unit, the angle control unit, and the detecting unit in accordance with optical conditions and the measurement conditions, acquire a first reflectance profile by actual measurement regarding the periodic structure, calculate a thickness of each layer constituting the periodic structure by fitting the first reflectance profile to a second reflectance profile obtained by a simulation using the virtual film structure regarding the internal structure, and use the calculated thickness and the virtual film structure to restructure the shape of the periodic structure.