Abstract
In holography, spatially dependent amplitude and phase information about an unknown signal is encoded in an intensity image by means of interference with a known reference wave. In analogy with methods developed for radar, we introduce synthetic optical holography (SOH) for quantitative, phase-resolved imaging. In SOH, the reference wave of a digital hologram is defined point by point, uniquely combining technical simplicity, fast phase imaging and broadband operation from visible to terahertz frequencies within a single setup. To illustrate the advantage of SOH, we use it in conjunction with a scattering-type near-field optical microscope to perform near-field holography, improving the speed of operation by more than an order of magnitude while significantly simplifying the experiment.
© 2014 Optical Society of America
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