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A freestanding flexible metamaterial with negative refractive index was designed and fabricated at visible operating wavelength by setting the unit cell size below 200nm. The metamaterial has basically a multilayer fishnet structure with circular hole instead of the rectangular one to reduce the pitch size of the metamaterial. The metamaterial shows negative refractive index in optical regime between 570nm and 615nm with minimum index value near -2.

metamatrials; NIM; negative refractive index