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(a) The anisotropic degree R as a function of the bending angle θ and the length L of line AB [Fig. 1(d)]. The white dashed curve mark the minimum anisotropic ratio R = 0.53 of silicon-air layered structure. SPP Resonators are achievable by silicon-air layered structure (indicated by solid shapes) if R>0.53; and unachievable if R<0.53 (indicated by dashed shapes). (b) The distribution of magnetic field Hz of a hexagonal SPP resonator formed by silicon-air layered structure.
