Fig. 1. (a) Schematic of a unit cell with centrosymmetric structure and the period p=2  μm. (b) Schematic of the cross, including the gold and La0.7Ca0.3MnO3 in the unit cell, with the dimensions of a=800  nm, b=300  nm, c=640  nm, d=150  nm, and e=100  nm. (c) Schematic of the gold cross.

Fig. 2. (a) Reflection, (b) transmission, (c) absorption, and (d) phase of the transmission coefficient as functions of the frequency for different H0 values.

Fig. 3. Current distributions in the gold and La0.7Ca0.3MnO3 at (a) 165, (b) 125, and (c) 150 THz corresponding to 9 Oe and 62.1 and 65.1 kOe, respectively. The areas surrounded by blue dotted lines are the concentrated values of the current oscillations.

Fig. 4. Schematics of the (a) ENCM, (b) EIM, and (c) EWCM corresponding to the areas marked by blue dotted lines shown in Figs. 3(a), 3(b), and 3(c), respectively. The material of the structures is gold.

Fig. 5. (a) Reflection and (b) transmission as functions of the frequency corresponding to the three models in Figs. 4(a), 4(b), and 4(c), respectively.