T-ray can see more... Example: Isosurface
Anis Rahman, PhD
Terahertz nanoscanning spectrometer and 3D imager with lattice resolution
An isosurface is a surface of constant value of a physical property, such as the dielectric constant, in a three-dimensional volume. The isosurface separates regions less than a given “isovalue” from regions greater than the same isovalue. All points on the isosurface have the same value (the isovalue). This is a convenient way to visualize the distribution/ arrangement of a given material within a volume, defined by its isovalue, computed from the measured terahertz reflectance. An example is given below.
Fig. 1. T-ray volume image of a segment of a patterned wafer (low resolution).
Fig. 2. Isosurface image of the patterned wafer in Fig. 1. Material distribution with identical dielectric constant is shown.
Fig. 3. The same isosurface as Fig. 2, from a different angle of view.
Summary
Isosurface analysis is a convenient way to assess materials distribution of similar properties within a given volume. T-ray volume images are suitable for such analysis.
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