“School of Nano-Sciences”
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| Paper IPM / Nano-Sciences / 15044 |
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In this paper, we apply structured illumination toward super-resolved 3D imaging in a common-path digital
holography arrangement. Digital holographic microscopy (DHM) provides non-invasive 3D images of transparent
samples as well as 3D profiles of reflective surfaces. A compact and vibration-immune arrangement for DHM may
be obtained through the use of aMirau microscope objective. However, high-magnificationMirau objectives have a low working distance and are expensive. Low-magnification ones, on the other hand, suffer from low lateral resolution. Structured illumination has been widely used for resolution improvement of intensity images, but the technique can also be readily applied to DHM. We apply structured illumination to Mirau DHM by implementing successive sinusoidal gratings with different orientations onto a spatial light modulator (SLM) and forming its image on the specimen.Moreover, we show that, instead of different orientations of 1D gratings, alternative single 2D gratings, e.g. checkerboard or hexagonal patterns, can provide resolution enhancement in multiple directions. Our results show a 35
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