Figure 3 | U-STED microscopy of core–shell UCNPs with topology-driven ETNs. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 3 | U-STED microscopy of core–shell UCNPs with topology-driven ETNs.

Caption

Figure 3 | U-STED microscopy of core–shell UCNPs with topology-driven ETNs. (A) Confocal and U-STED images showing 450‑nm UCL from Tm@Yb@Y UCNPs under dual-beam irradiation with a Gaussian-shaped 980 nm excitation laser and a donut-shaped 808 nm depletion laser. Magnified views highlight detailed features (red and blue boxes). Excitation/depletion intensities: 0.03 MW cm-2 (980 nm) and 1 MW cm-2 (808 nm). Pixel dwell time: 10 ms. Scale bar: 1 μm. (B) Normalized UCL intensity profiles along the dashed lines in (A), showing improved resolution under U-STED conditions.

Credit

Min Gu et al.

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