Lumped elements circuit of terahertz fishnet-like arrays with composite dispersion

Jorge Carbonell (1) , Charles Croënne (2) , Frédéric Garet (3) , Eric Lheurette (2) , Jean-Louis Coutaz (3) , Didier Lippens (2)

1 UPV - Universitat Politècnica de València = Universitad Politecnica de Valencia = Polytechnic University of Valencia
2 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
3 IMEP-LAHC - Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation

We have analyzed and characterized a terahertz stacked holes array over a broad transmission bandwidth. In this context, we identify the key contributions of the surface plasmon modes related to the periodicity of array, and of the subcut off transmission through the holes responsible of a ground left-handed dispersion branch. The experimental verification of a multimode electromagnetic behavior is performed by time domain spectroscopy, with a complementary assessment by full-wave analysis. A circuitlike approach appears suitable for the understanding of a zero-gap transition between the left- and right-handed characteristics, opening the way of nonvanishing group velocity in a near-zero index propagation medium. Such a balanced composite operation, pointed out over the past in the dual element transmission line approaches, is thus generalized for a stacked subwavelength holes array, whose operation can be compared to the one of the so-called fishnet structures

Domaines: Electronique

Jorge Carbonell, Charles Croënne, Frédéric Garet, Eric Lheurette, Jean-Louis Coutaz, et al.. Lumped elements circuit of terahertz fishnet-like arrays with composite dispersion. Journal of Applied Physics, 2010, 108 (1), pp.014907. ⟨10.1063/1.3455994⟩. ⟨hal-00548689⟩