Fig. 11

The magnetic field distribution for the optimum structure at different incident frequencies, (a) the frequency\(\:\:=\:1.09\times\:{10}^{12}\:THz\), (b) the frequency =\(\:\:1.27\times\:{10}^{12}\:THz\), and (c): the frequency =\(\:\:2.28\times\:{10}^{12}\:THz\).