This striking visual is a heatmap that showcases the transformation of a diamond substrate analyzed under an atomic force microscope at one of the nation’s most respected technical universities. The two images above are the same 50um x 50um region of a 4.0mm x 4.0mm sample that was originally sourced from a leading global manufacturer of synthetic diamonds.
The sample exhibited significant surface roughness prior to treatment. After precision polishing, the surface achieved ultra-smooth characteristics, well within quantum-grade tolerances, as evidenced by the dramatic reduction in deviation, step height, and RMS roughness across both center and edge regions.
Note: Sample was analyzed by an AFM Jupiter XR using tapping mode topography with high strength tips. Institutional and manufacturer names have been withheld for privacy.
Why surface finish is important..
This is a typical diamond substrate prior to polishing, with heavy etching clearly visible across the entire face. The surface is clouded, uneven, and optically rough. This surface appearance is typical after a diamond has been laser cut and has yet to undergo surface polishing.
Such a finish is not suitable for quantum or photonic applications, as the surface irregularities introduce:
- High optical scatter and light loss
- NV center instability and reduced spin coherence
- Poor bonding interface performance
- Unreliable photon emission uniformity
The etched texture disrupts both optical clarity and atomic-level smoothness, making this surface unsuitable for high-precision qubit, sensing, or photonic integration work until it undergoes controlled polishing and surface reconstruction.
In this post-polish image, the diamond substrate surface has been fully restored to a smooth, optically clear, and uniform finish. All etching artifacts, micro-pits, and haze have been removed, resulting in a surface that is clean at both the visual and atomic scale.
The final surface roughness measures firmly within quantum-grade tolerances for NV center formation, single-photon emission, device bonding, and photonic integration. This level of refinement eliminates scatter pathways, supports long spin coherence stability, and ensures reliable optical coupling.
This finish represents the highest polish class we offer—completely flat, distortion-free, and suited for the most demanding diamond-based quantum and photonic applications.