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In this paper we discuss and experimentally demonstrate that in a quasi- zero-average-refractive-index (QZAI) metamaterial, in correspondence of a divergent source in near infrared (λ = 1.55 μm) the light scattered out is extremely directive (Δθout = 0.06°), coupling with diffraction order of the alternating complementary media grating. With a high degree of accuracy the measurements prove also the excellent vertical confinement of the beam even in the air region of the metamaterial, in absence of any simple vertical confinement mechanism. This extremely sensitive device works on a large contact area and open news perspective to integrated spectroscopy.
Optical Society of America
Publication date: 
22 Nov 2010

Vito Mocella, Principia Dardano, Ivo Rendina, Stefano Cabrini

Biblio References: 
Volume: 18 Issue: 24 Pages: 25068-25074
Optics express