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

Figure 2.

Figure 2

Scanning electron microscope images of the PNPs used in this work, with plasmon resonances at 980 and 574 nm (a and e, respectively). Histogram of the size distribution of Au PNPs with plasmon resonances at 980 and 574 nm (b and f, respectively). Extinction spectra of the PNPs showed the plasmon resonances at 980 and 574 nm (c and g, respectively). The gray dashed line indicates the wavelength of the trapping laser (980 nm). (d) Increase in local temperature induced by the PNPs under 980 nm irradiation as a function of the laser power density (red and yellow lines for the Au PNPs with plasmon resonances at 980 and 574 nm, respectively). (h) Fluorescence image of a single optically trapped UCNP on top of the substrate with PNPs with λSPR ≅ 574 nm under 980 nm excitation.