Figure 2.

Library-based parameter retrieval from synthetic far-field scattering patterns. (a) Layout of the scattering problem: a light source moves with respect to a four-element chain of scatterers. (b) Calculated scattering pattern for the light source 0.25λ south of the center of the array. (c) Scattering pattern for a light source 0.90λ east of center. (d) Singular value decomposition of a set of reference radiation patterns. Round panels show radiation pattern basis elements versus wavevector and square panels show principal components versus reference position. Numbers indicate the index of the element, as ordered by singular value. Black circles indicate the position of the array elements. (e) Singular values for the decomposition in (d) and for the same problem at half the spatial resolution.