Experimental verification of negative refraction for a wedge-type negative index metamaterial operating at terahertz

Shengxiang Wang (1) , Frédéric Garet (2) , Karine Blary (1) , Eric Lheurette (1) , Jean-Louis Coutaz (2) , Didier Lippens (1)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 IMEP-LAHC - Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation

We report on angle-resolved time domain spectroscopy TDS carried out on a prismlike negative index metamaterial operating around 0.5 THz. The wedge-type devices are constituted of hole arrays etched in gold thin films, which are stacked according to a sequential mask shift. By means of a goniometric TDS setup and subsequent analysis of the temporal waveforms, negative refraction is demonstrated with values close to n=−1 around 0.5 THz. The dispersion of refractive index retrieved from the Snell–Descartes law shows comparable trends in comparison with the dispersion deduced from complex transmission and reflection measurements on slab-type samples

Domaines: Optique [physics.optics]

Shengxiang Wang, Frédéric Garet, Karine Blary, Eric Lheurette, Jean-Louis Coutaz, et al.. Experimental verification of negative refraction for a wedge-type negative index metamaterial operating at terahertz. Applied Physics Letters, 2010, 97, pp.181902. ⟨10.1063/1.3511540⟩. ⟨hal-00991478⟩