The refractive index of natural transparent materials in visible wavelength range is limited to 2~3. However, for advanced optical applications like nanoimaging and integrated photonics, refractive index need to be controlled in a wider range. We fabricated metamaterials with period and symmetry-tunable self-assembled nanopatterns which can control refractive index for broad wavelength range, including visible light. Nanoscale objects smaller than skin depth allow independent control of permeability and permittivity. The effective refractive index increased up to 5.10 by precisely adjusting the interobject distance through the shrinkage of the block copolymer nanopatterns, and maintained above 3.0 over more than 1,000nm wavelength bandwidth. spatially graded and anisotropic refractive indices. Also, spatially graded and anisotropic refractive indices were obtained by modification of transitional and rotational symmetry design.