1 You have signs of infection, such as: 2  Increased pain, swelling, warmth, or redness around the bite. 3  Red streaks leading from the bite. 4  Pus draining from the bite.  A fever.
A negative index of refraction due to three-dimensional chirality is demonstrated for abilayered metamaterial based on pairs of mutually twisted planar metal patterns in parallel planes, which alsoshows negative electric and magnetic responses and exceptionally strong optical activity and circular dichro-ism.
To achieve active control of the refractive index in a THz metamaterial, an array of meta-atoms, an atomically thin graphene layer, and an array of metallic wire gate electrodes are functionally configured together into an ultra-compact, thin, and flexible polymeric substrate.