Three-dimensional optical metamaterial with a negative refractive index

  title={Three-dimensional optical metamaterial with a negative refractive index},
  author={Jason G. Valentine and Shuang Zhang and Thomas Zentgraf and Erick Ulin-Avila and Dentcho A. Genov and Guy Bartal and Xiang Zhang},
Metamaterials are artificially engineered structures that have properties, such as a negative refractive index, not attainable with naturally occurring materials. Negative-index metamaterials (NIMs) were first demonstrated for microwave frequencies, but it has been challenging to design NIMs for optical frequencies and they have so far been limited to optically thin samples because of significant fabrication challenges and strong energy dissipation in metals. Such thin structures are analogous… 
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