|Title||Gradient index circuit by waveguided metamaterials|
|Publication Type||Journal Article|
|Year of Publication||2009|
|Authors||R..P. Liu, X..M. Yang, J..N. Gollub, J.J. Mock, T..J. Cui, D.R. Smith|
|Journal||Applied Physics Letters|
Metamaterials are artificially structured materials that provide considerable flexibility for control of electromagnetic waves. The metamaterial concept can also be applied to the design of planar waveguiding structures. Here, we illustrate this design approach with the development of two-dimensional (2D) planar gradient index (GRIN) circuits. To form the structure, we make use of a 2D complementary split ring resonator, which exhibits an electric response to guided transverse-electric waves. To confirm the properties of the planar GRIN structure predicted from numerical simulations, we present experimental results for a beam-steering and a focusing GRIN circuit. These examples illustrate the versatility of the metamaterial approach in the design of complex waveguiding structures.