We developed an ultrahigh-resolution full-field optical coherence tomography (FF-OCT) microscope that is based on the spatial, rather than the temporal, coherence gating. The microscope is capable of observing three-dimensional microbiological structures as small as $0.4\hspace{0.17em}\mathrm{\mu m}\times 0.4\hspace{0.17em}\mathrm{\mu m}\times 1.0\hspace{0.17em}\mathrm{\mu m}$ ($xyz$) using quasi-monochromatic light and a liquid crystal retarder. Unlike traditional FF-OCT systems, this microscope can be operated in high resolution for any preferable wavelength with minimized defocusing and dispersion effects. High-resolution images of an onion cell are presented.

© 2012 Optical Society of America

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