Fig. 1. Calculation flow chart of scattering characteristics of Ag@TiO₂ core-shell nanoparticles

Fig. 2. Schematic diagram of nanoparticle geometry and simulation area. (a) Ag@TiO₂ core-shell nanoparticle geometry; (b) FEM simulation area

Fig. 3. Scattering spectra in water (n_m=1.33). (a) Ag@TiO₂ core-shell nanospheres; (b) Ag nanospheroid;

Fig. 4. Variations of volume scattering coefficient A_sca of Ag@TiO₂, Au@TiO₂, and Cu@TiO₂ core-shell nanoparticles with wavelength λ of incident light. (a) Core-shell nanospheroid; (b) core-shell nanorod

Fig. 5. Scattering spectra and formant peaks of Ag@TiO₂ core-shell nanoparticles with core length L. Core-shell nanospheroid: (a) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different core length L; (b) variations of resonance wavelength and peak value with core length L; core-shell nanorod: (c) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different core length L; (d) variations of resonance wavelength and peak value with core length L

Fig. 6. Scattering spectra and formant peaks of Ag@TiO₂ core-shell nanoparticles with core aspect ratio R_A. Core-shell nanospheroid: (a) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different core aspect ratio R_A; (b) variations of resonance wavelength and peak value with core aspect ratio R_A; core-shell nanorod: (c) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different core aspect ratio R_A; (d) variations of resonance wavelength and peak value with core aspect ratio R_A

Fig. 7. Scattering spectra and formant peaks of Ag@TiO₂ core-shell nanoparticles with shell thickness t. Core-shell nanospheroid: (a) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different shell thickness t; (b) variations of resonance wavelength and peak value with shell thickness t; core-shell nanorod: (c) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different shell thickness t; (d) variations of resonance wavelength and peak value with shell thickness t

Fig. 8. Scattering spectra and formant peaks of Ag@TiO₂ core-shell nanoparticles with refractive index of biological tissue n_m. Core-shell nanospheroid: (a) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different refractive index of biological tissue n_m; (b) variations of resonance wavelength and peak value with refractive index of biological tissue n_m; core-shell nanorod: (c) variations of volume scattering coefficient A_sca with wavelength λ of incident light at different refractive index of biological tissue n_m; (d) variations of resonance wavelength and peak value with refractive index of biological tissue n_m

Fig. 9. Variations of volume scattering coefficient A_sca of Ag@TiO₂ core-shell nanoparticles with the wavelength λ of incident light in different orientations. (a) Core-shell nanospheroid; (b) core-shell nanorod

Fig. 10. Optimization of size parameters of Ag@TiO₂ core-shell nanoparticles at typical wavelengths. (a) Core-shell nanospheroid at 808 nm; (b) core-shell nanorod at 808 nm; (c) core-shell nanospheroid at 980 nm; (d) core-shell nanorod at 980 nm