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Flexible coherent diffraction lithography is proposed and preliminarily tested by means of an optical phase mask. The phase mask consisted of a two-dimensional hexagonal lattice of reversed ferroelectric domains engineered in a z-cut lithium niobate substrate and was electro-optically tunable. Appropriate phase shift values across adjacent reversed domains were induced by the application of an external...
A simple and low-cost solution for tracking the frequency of WDM channels, based on the thermo-optic tuning of single-cavity Fabry-Perot silicon optical filters, is presented. High finesse and narrow bandwidth are obtained thanks to coating stacks deposited by e-beam evaporation on both facets of a previously thinned and polished silicon wafer. The filter, in a first prototypal version, resolves up...
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