Fig. 1. Schematic of the rectangular-like nanorod tetramer

Fig. 2. Transmission spectra, electric field and charge distribution of the rectangular-like nanorod tetramer

Fig. 3. Transmittance spectra and electric field distribution of rectangular-like nanorod tetramer varying with polarization angle

Fig. 4. The relationship between the transmittance and the polarization angle

Fig. 5. Transmission spectra with different refractive index n and sensitivity curve when θ=0°

Fig. 6. Transmission spectra with different refractive index n and sensitivity curve when θ=90°

Fig. 7. Transmission spectra and the electric field distribution at the transmission valley with different periods P

Fig. 8. The transmission spectra with different periodsizes P_x and P_y and charge distribution at transmission valley when θ=0°

Fig. 9. The transmission spectra with different period sizes P_x and P_y and charge distribution at transmission valley when θ=90°

Fig. 10. Transmission spectra of rectangular-like nanorod tetramer with different spacings d₁

Fig. 11. Transmission spectra of rectangular-like nanorod tetramer with different horizontal nanorod lengths l₁

Fig. 12. Transmission spectra of rectangular-like nanorod tetramer with different vertical nanorod lengths l₂