Abstract
An optimization-free approach is proposed for generating optical needle and bright spot arrays with controllable distributions. This is achieved by inversely focusing the radiation pattern from a collinear antenna array whose elements are placed along an optical axis and whose currents in each element also flow along that direction, situated at the focus of a 4pi configuration. The shape and central location of the nth focusing field only depend on the length ln and coordinate zn of the nth element in collinear array, respectively. The number of focal fields is determined by the number of elements in the array.
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