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. 2017 May 12;8:15271. doi: 10.1038/ncomms15271

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Copyright © 2017, The Author(s)

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(a) The optical conductivity, σ₁(ω), of hp-SNO (1 × 10⁻⁴ Torr) films with varying thicknesses. The σ₁(ω) of the standard ∼168 nm hp-SNO is also shown for reference. (b) Evolution of spectral weight, W, of three energy regions: W₁ (0.6–2.0 eV), W₂ (2.0–4.3 eV) and W₃ (4.3–6.5 eV) across hp-SNO films with varying thicknesses. The W_tot is the total W from 0.6 to 6.5 eV. The W₃ of mp-SNO (purple filled circle) is also shown for comparison. The abbreviation ‘CP' stands for ‘correlated plasmon'.