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Response of a ridge-based interferometer to immobilized protein. The ridge in (a) performs as a wavefront splitting interferometer, with half intensity on the ridge and half on the land. The intensity along the optic axis exhibits an ideal two-wave response, shown in (b) as a function of ridge height. The far-field diffraction is shown in (c) for different spoke heights, and the change in intensity upon protein immobilization is shown in (d).
