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. 2024 Mar 18;24(12):3785–3792. doi: 10.1021/acs.nanolett.4c00379

Figure 3.

Figure 3

(a) Schematic representation of the horizontal scan of an optically tweezed UCNP along a substrate partially covered with Au PNPs. (b) Schematic representation of the vertical scan of an optically tweezed UCNP with respect to the substrate with PNPs. (c) Periodic change in the upconversion luminescence intensity during the horizontal scan of a single UCNP along a substrate partially covered with PNPs. (d) Upconversion intensity generated by a tweezed UCNP during a vertical scan. Data obtained in the presence and absence of PNPs are included for comparison. All of the data included in this figure were obtained for a laser power intensity of 4.3 MW cm–2 and for the PNPs with λSPR ≅ 574 nm.