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We demonstrate digital plasmonic holography for direct in-plane imaging with propagating surface-plasmon waves.Imaging with surface plasmons suffers from the lack of simple in-plane lenses and mirrors.Lens-less digital holography techniques,however,rely on digitally decoding an interference patte between a reference wave and an object wave.With far-field diffractive optics,this decoding scheme provides a full recording,i.e.,a hologram,of the amplitude and phase of the object wave,giving three-dimensional information from a two-dimensional recording.For plasmonics,only a one-dimensional recording is needed,and both the phase and amplitude of the propagating plasmons can be extracted for high-resolution in-plane imaging.Here,we demonstrate lens-less,point-source digital plasmonic holography using two methods to record the plasmonic holograms:a dual-probe near-field scanning optical microscope and lithographically defined circular fluorescent screens.The point-source geometry gives in-plane magnification,allowing for high-resolution imaging with relatively lower-resolution microscope objectives.These results pave the way for a new form of in-plane plasmonic imaging,gathering the full complex wave,without the need for plasmonic mirrors or lenses.