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31 May 2011 Super-directive beam from metamaterials
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In a quasi- zero-average-refractive-index (QZAI) metamaterial, the light scattered out is extremely directive (Δθout = 0.06°), in despite of a divergent source at near infrared wavelength (λ=1.55 mm). In this paper we discuss and experimentally demonstrate that this is possible when the light is coupled with diffraction order of a grating with alternating complementary media. The experimental data prove with a high degree of accuracy also the strong vertical confinement of the beam even in the air region of the metamaterial, where any simple vertical confinement mechanism is absent. This extremely sensitive device works on a large contact area and open news perspective to integrated spectroscopy.
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Vito Mocella, Principia Dardano, Ivo Rendina, and Stefano Cabrini "Super-directive beam from metamaterials", Proc. SPIE 8069, Integrated Photonics: Materials, Devices, and Applications, 80690G (31 May 2011);

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