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An omni-directional retroreflecting structure is introduced and analyzed in this work. The device is a composite assembly of individual retroreflectors, whose orientations are aligned in such a way that the individual - and θ-dependent angular retroreflective responses overlap over 90° intervals. It is shown that this overlapped structural response allows for retroreflection over the full 4π steradians solid angle. The dynamic response of the omni-directional device is then tested in a simplified passive uplink communication configuration with liquid crystal (LC) optical modulators covering the composite entrance interfaces. The modulation characteristics of the LC shutters are effectively mapped onto the retroreflected beam.
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Collier et al. (2009) studied this question.
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