ArticleNano letters2026
Metalens Enables Parallel Chromatic Confocal Imaging over a Millimeter-Scale Depth Range with an Axial Space-Bandwidth Product of 68.
Article in Nano letters, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Confocal microscopy provides optical sectioning and micrometer-scale resolution but remains constrained by mechanical axial scanning and bulky optics. Leveraging the intrinsic chromatic dispersion of a custom-designed metalens, we demonstrate parallel confocal depth imaging over a 1.3 mm axial range within a 200 nm visible bandwidth by encoding wavelengths into different axial positions to eliminate mechanical axial scanning, which yields an axial space-bandwidth product (ASBP) of ≈68. A single-mode fiber functions simultaneously as an illumination/collection probe and confocal pinhole, forming a compact design. The system achieves an axial resolution of 11.4 μm (axial sensitivity of 0.15 μm) and a lateral resolution of 2.19 μm near the optimal wavelength of 530 nm. The parallel confocal imaging capability across an extended depth is further validated by depth-resolved imaging and surface profile measurement. This compact, label-free platform underscores the potential of meta-optical chromatic confocal imaging for large-depth, high-resolution microscopic applications.
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