Fig. 4

(a and c)show electric field distribution along the positive x-axis at resonant wavelengths λ1&λ2 and (b and d) show magnetic field distribution along the positive y-axis at resonant wavelength λ1 &λ2.

(a and c)show electric field distribution along the positive x-axis at resonant wavelengths λ1&λ2 and (b and d) show magnetic field distribution along the positive y-axis at resonant wavelength λ1 &λ2.