Frequency-diverse phase holograms with spatial filtering for submillimeter-wave imaging

A design technique for frequency-diverse phase holograms using spatial filtering to enhance submillimeter-wave imaging performance is presented. The frequency-diverse holograms are designed to create complex, spatially varying field patterns for an imaging system operating at 325-355 GHz. The proposed technique uses spatial filtering during the hologram synthesizing process to eliminate the wide-angle plane-wave components. This minimizes the field dispersion outside the region of interest, improving the signal-to-noise ratio and imaging performance.