High resolution digital holographic microscopy with a wide field of view based on a synthetic aperture technique and use of linear CCD scanning

摘要

Theoretical analysis shows that, to improve the resolution and the range of the field of view of the re-constructed image in digital lensless Fourier transform holography, an effective solution is to increase the area and the pixel number of the recorded digital hologram. A new approach based on the synthetic aperture technique and use of linear CCD scanning is presented to obtain digital holographic images with high resolution and a wide field of view. By using a synthetic aperture technique and linear CCD scanning, we obtained digital lensless Fourier transform holograms with a large area of 3.5 cm X 3.5 cm (5000 X 5000 pixels). The numerical reconstruction of a 4 mm object at a distance of 14 cm by use of a Rayleigh-Sommerfeld integral shows that a theoretically minimum resolvable distance of 2.57 (mu)m can be achieved at a wavelength of 632.8 nm. The experimental results are consistent with the theoretical analysis.