Franklin Kalk

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Variable angle of incidence spectroscopic ellipsometry (VASE) is commonly used for multilayer optical analysis, but in some cases this experiment (performed in reflection) does not provide sufficient information for the unique determination of the thicknesses and optical constants of the films in the given multilayer. We have found that augmenting the VASE(More)
The demand for smaller and more uniform features on photomasks is rapidly increasing. The complexity of these patterns is also increasing with the need for optical proximity correction and phase shifting structures. These complex mask features demand unprecedented accuracy in pattern placement and dimensional control. We have conducted research designed to(More)
Scatterometry is presented as an optical metrology technique potentially capable of determining the critical parameters of phase shifting diffraction grating test structures (sidewall profile, linewidth, and etch depth where appropriate). The technique is noncontact, rapid and nondestructive. The test grating structure is illuminated by a laser beam and the(More)
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