Fig. 1. Cross-sectional (XZ) view of Rh nanostructure model

Fig. 2. Comparison of LSPR properties of Rh, Au and Ag at different wavelengths. (a) Real part of the permittivity; (b) imaginary part of the permittivity; (c) quality factors for LSPR

Fig. 3. Simulation results of LSPR effect of Rh nanoparticles with different diameters. (a) Extinction spectra; (b) variation trend of formant under the longitudinal mode; (c) variation trend of formant under the transverse mode; (d) electric field distribution in the XY plane with a diameter of 100 nm under the transverse mode; (e) electric field distribution in the XY plane with a diameter of 100 nm under the longitudinal mode; (f) electric field distribution in the XY plane with a diameter of 140 nm under the longitudinal mode

Fig. 4. Simulation results of LSPR effect of Rh nanoparticles at different heights. (a) Extinction spectra; (b) variation trend of formant under the longitudinal mode; (c) variation trend of formant under the the transverse mode; (d) electric field distribution in the XY plane with a height of 90 nm under the transverse mode; (e) electric field distribution in the XY plane with a height of 90 nm under the longitudinal mode; (f) electric field distribution in the XY plane with a height of 120 nm under the longitudinal mode

Fig. 5. Simulation results of LSPR effect of Rh nanoparticles at different spacing.(a) Extinction spectra; (b) variation trend of formant under the longitudinal mode; (c) variation trend of formant under the transverse mode; (d) electric field distribution in the XY plane with a spacing of 100 nm under the transverse mode; (e) electric field distribution in the XY plane with a spacing of 100 nm under the longitudinal mode; (f) electric field distribution in the XY plane with a spacing of 120 nm under the longitudinal mode

Fig. 6. Electron distribution between a pair of Rh nanoparticles. (a) Longitudinal mode; (b) transverse mode

Fig. 7. Simulation results of LSPR effect of Rh nanoparticles with different substrate refractive indices.(a) Extinction spectra; (b) variation trend of formant under the longitudinal mode; (c) electric field distribution in XY plane of substrate with refractive index of 1 under the longitudinal mode; (d) electric field distribution in XY plane of substrate with refractive index of 1.6 under the longitudinal mode

Fig. 8. Simulation results of LSPR effect of Rh nanoparticles under different environmental refractive indices. (a) Extinction spectra; (b) variation trend of formant under the longitudinal mode