This study presents a phase-modulation technique capable of flexibly extending the depth-of-field (DOF) of any diffraction pattern. This method, deep diffractive optics (DDO), involves integrating a needle-shaped beam phase modulator with a conventional phase pattern design. Our findings reveal that these current DDOs can significantly extend the DOF over traditional diffractive optics by a factor of five. This method holds broad potential for applications in various optical devices, systems, and emerging fields of photonics.
Cellular resolution of optical coherence tomography (OCT) is vital to achieving precise diagnosis by offering high-quality images of slide-free histology. Currently, the common solution is to apply dynamic focusing to axially translate the focus through the region of interest with a high numerical aperture (N.A.) objective, followed by Z-stacking to rebuild a high-resolution 3D volume. To accelerate the imaging acquisition, this work developed optical metasurface plates to generate multiple foci along the axial direction. Two-/three-/seven-foci had been testified with bead phantom using a scanning OCT. Human skin and human brain samples were imaged with cellular resolution.
Cellular resolution of optical coherence tomography (OCT) is vital to achieve precise diagnosis by offering high-quality images of virtual biopsy. Currently, the common solution is to apply dynamic focusing to axially translate the focus through the region of interest with a high numerical aperture (N.A.) objective, followed by Z-stacking to rebuild a high-resolution 3D volume. To accelerate the imaging acquisition, this work developed metasurface optical plates to generate multiple foci along axial direction. Two-/three-/seven-foci had been testified with bead phantom using a scanning OCT. Human skin and human brain samples were imaged with cellular resolution.
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