Fig. 1. Schematic diagram of Na nanoshell

Fig. 2. Influence of in-shell and out-shell media of Na nanoshell on ground-state conduction electron density n0. (a) Influence of in-shell medium on n0; (b) influence of out-shell medium on n0

Fig. 3. Schematic diagram of surface plasmon hybridization and absorption spectrum for Na nanoshell. (a) Schematic diagram of surface plasmon hybridization in metallic nanoshell; (b) absorption spectra for Na nanoshell in which in-shell and out-shell media are vacuums calculated using LRA, TFHT and QHT

Fig. 4. Influence of in-shell and out-shell media of Na nanoshell on its absorption spectra. (a) LRA; (b) TFHT; (c) QHT

Fig. 5. Absorption spectra for Na nanoshell for different in-shell and out-shell media computed using LRA, TFHT and QHT. (a)(c)(e) Absorption spectra for different in-shell media; (b)(d)(f) absorption spectra for Na nanoshell for different out-shell media

Fig. 6. Results of surface plasmon mode amplitude and resonance energy for Na nanoshell calculated using three methods. (a) Relationship curves between surface plasmon mode amplitude for Na nanoshell and in-shell dielectric constant; (b) relationship curves between surface plasmon mode amplitude for Na nanoshell and out-shell dielectric constant; (c) relationship curves between surface plasmon mode resonance energy for Na nanoshell and in-shell dielectric constant; (d) relationship curves between surface plasmon mode resonance energy for Na nanoshell and out-shell dielectric constant