Browsing by Author "de Ceglia, Domenico"
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Item Dynamics of short pulses and phase matched second harmonic generation in negative index materials(OSA Publishing, 2006) Scalora, Michael; D’Aguanno, Giuseppe; Bloemer, Mark; Centini, Marco; de Ceglia, Domenico; Mattiucci, Nadia; Kivshar, Yuri S.We study pulsed second harmonic generation in metamaterials under conditions of significant absorption. Tuning the pump in the negative index range, a second harmonic signal is generated in the positive index region, such that the respective indices of refraction have the same magnitudes but opposite signs. This insures that a forward-propagating pump is exactly phase matched to the backward-propagating second harmonic signal. Using peak intensities of ~500 MW/cm², assuming χ⁽²⁾~80pm/V, we predict conversion efficiencies of 12% and 0.2% for attenuation lengths of 50 and 5µm, respectively.Item Energy considerations for a superlens based on metal/dielectric multilayers(OSA Publishing, 2008) Bloemer, Mark J.; D’Aguanno, Giuseppe; Scalora, Michael; Mattiucci, Nadia; de Ceglia, DomenicoWe investigate the resolution and absorption losses of a Ag/GaP multilayer superlens. For a fixed source to image distance the resolution is independent of the position of the lens but the losses depend strongly on the lens placement. The absorption losses associated with the evanescent waves can be significantly larger than losses associated with the propagating waves especially when the superlens is close to the source. The interpretation of transmittance values greater than unity for evanescent waves is clarified with respect to the associated absorption losses.Item Metal/Dielectric Photonic Crystal with Broadband Transparency for Propagating and Evanescent Waves(OSA Publishing, 2007) Bloemer, Mark J.; D’Aguanno, Giuseppe; Mattiucci, Nadia; de Ceglia, Domenico; Scalora, Michael; Akozbek, NesetStrongly coupled metal/dielectric cavities with anti-reflection coatings at the entrance and exit faces provide a very broad transmission band for both the evanescent and propagating waves. Power lost through the super-resolution process is also examined.Item Negative Refraction and Superresolution Using Transparent Metallo-Dielectric Stacks(OSA Publishing, 2006) Scalora, Michael; D'Aguanno, Giuseppe; Akozbek, Neset; Centini, Marco; de Ceglia, Domenico; Cappeddu, Mirko; Mattiucci, Nadia; Haus, Joseph; Bloemer, Mark J.Negative refraction is known to occur in materials that simultaneously possess a negative electric permittivity and magnetic permeability; hence they are termed negative index materials. However, there are no known natural materials that exhibit a negative index of refraction. In large part, interest in these materials is due to speculation that they could be used as perfect lenses with superresolution. We propose a new way of achieving negative refraction with currently available technology, based on transparent, metallodielectric multilayer structures. The advantage of these structures is that both tunability and transmission (well above 50%) can be achieved in the visible wavelength regime. We demonstrate both negative refraction and sub-wavelength resolution in these structures. Our findings point to a simpler way to fabricate a material that exhibits negative refraction. This opens up an entirely new path not only for negative refraction, but also to expand the exploration of wave propagation effects in metals.