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. 2018 Aug 17;4(8):eaat0292. doi: 10.1126/sciadv.aat0292

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — Schematic structure (A), TEM (B), and FDTD-simulated electric field distribution (C) images of the Au@dye/SiO₂ nanoprobe [yellow core and green layer in (A) denote the Au core and the outer dye-doped SiO₂ layer, respectively]. (D) Plasmon resonance absorption (1), excitation (2), spontaneous emission (3), split spontaneous emission S₁→S₀ (4) and T₂→S₀ (5), and stimulated emission (6) curves of the nanoprobe. Inset in (D) is the observed stimulated emission spectrum of the nanoprobe. Emission lifetime of S₁→S₀ (E) and T₂→S₀ (F) by using the dye. a.u., arbitrary units; FWHM, full width at half maximum.