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Superresolution Far-field Imaging of Complex Objects Using Reduced Superoscillating Ripples

Posted on 2017-09-14 - 16:40
Superoscillation is a phenomenon where a wave oscillates locally faster than its highest Fourier component. While previous reports have shown attractive possibilities for a superoscillation-based far-field superresolution imaging device, it has also been recognized that a high-energy "sideband" region coexists with the superresolution features. This sideband causes strong restrictions and necessitates tradeoffs in achievable resolution, viewing area, and sensitivity of the imaging device. In this work we introduce a new class of superoscillation waveform --- which consists of a diffraction-limited hotspot surrounded by low-energy superoscillating sidelobe ripples. This waveform alleviates the aforementioned tradeoff, and enables superresolution imaging for complex objects over a larger viewing area, while maintaining a practical level of sensitivity. Using this waveform as the point-spread function (PSF) of an imaging system, we demonstrate the successful superresolution of Latin letters without performing scanning and/or post-processing operations.

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