Abstract:
Disclosed is a method comprising: obtaining measured data relating to at least one measurement by a measurement apparatus configured to irradiate radiation onto each of one or more structures on a substrate; decomposing the measured data using a decomposition method to obtain multiple measured data components; obtaining simulated data relating to at least one simulation based on the one or more structures; decomposing the simulated data using the decomposition method to obtain multiple simulated data components; matching between at least a portion of the simulated data components and at least a portion of the measured data components; and extracting a feature of the substrate based on the matching of at least a portion of the simulated data components and at least a portion of the measured data components.
Abstract:
A method is proposed of using low-resolution images of at least one product produced by one or more imaging processes, and imaging models characterizing the imaging processes, to determine values for plurality of numerical parameters which collectively define a product model of the at least one product. The determination of the values is performed by forming a loss function based on the acquired images, the imaging models, and the numerical parameters of the model, and performing a minimization algorithm to minimize the loss function with respect to the numerical parameters. Due to prior knowledge of the product encoded in the loss function, the product model may comprise reconstructed images which have a higher resolution than the low-resolution images.
Abstract:
A lithographic system includes a lithographic apparatus and a scatterometer. In an embodiment, the lithographic apparatus includes an illumination optical system arranged to illuminate a pattern and a projection optical system arranged to project an image of the pattern on to a substrate (W). In an embodiment, the scatterometer includes a measurement system (2) arranged to direct a beam of radiation (10) onto a target pattern on said substrate (W) and to obtain an image of a pupil plane representative of radiation scattered from the target pattern. A computational arrangement (P4) represents the pupil plane by moment functions calculated from a pair of orthogonal basis function and correlates the moment function to lithographic feature parameters to build a lithographic system identification. A control arrangement uses the system identification to control subsequent lithographic processes performed by the lithographic apparatus.
Abstract:
A scatterometer configured to measure a property of a substrate, includes a radiation source configured to provide a radiation beam; and a detector configured to detect a spectrum of the radiation beam reflected from a target (30) on the surface of the substrate (W) and to produce a measurement signal representative of the spectrum. The apparatus includes a beam shaper (51, 53) interposed in the radiation path between the radiation source and the detector, the beam shaper being configured to adjust the cross section of the beam dependent on the shape and/or size of the target.
Abstract:
A lithographic system includes a lithographic apparatus and a scatterometer. In an embodiment, the lithographic apparatus includes an illumination optical system arranged to illuminate a pattern and a projection optical system arranged to project an image of the pattern on to a substrate. In an embodiment, the scatterometer includes a measurement system arranged to direct a beam of radiation onto a target pattern on said substrate and to obtain an image of a pupil plane representative of radiation scattered from the target pattern. A computational arrangement represents the pupil plane by moment functions calculated from a pair of orthogonal basis function and correlates the moment function to lithographic feature parameters to build a lithographic system identification. A control arrangement uses the system identification to control subsequent lithographic processes performed by the lithographic apparatus.