Browsing by Author "Bloemer, M.J."
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Item Electromagnetic density of modes for a finite-size structure(IEEE, 2005-05-02) D'Aguanno, G.; Mattiucci, N.; Scalora, M.; Bloemer, M.J.; Zheltikov, A.M.We give a simple and physically pleasing definition of the electromagnetic density of modes for finite-size structures filled with a generic dielectric material. The role of absorption and dispersion of the material is also investigated.Item Energy exchange properties during second harmonic generation in finite photonic band gap structures(IEEE, 2004-07-26) D’Aguanno, G.; Centini, M.; Scalora, M.; Sibilia, C.; Bertolotti, M.; Bloemer, M.J.; Bowden, C. M.The principal goals in optics is to achieve the basic knowledge necessary to tailor the properties of light. The more intriguing uses of one-dimensional (1-D) PBG structures that have recently been suggested is their utilization. In the case of second harmonic generation the strong feedback and pump-depletion makes the system almost intractable analytically, and has never been investigated numerically either. This dynamics was unexpected, and it is bound to influence the way one goes about thinking and designing nonlinear frequency conversion devices in a practical way.Item Excitation of bright and dark gap solitons in a negative index material(IEEE, 2006-01-10) Aguanno, G.D.; Mattiucci, N.; Scalora, M.; Bloemer, M.J.We predict the existence of bright and dark gap solitons in a slab of negative index material as a result of the interplay between the linear dispersive properties and the effect of a cubic nonlinearity.Item Experimental Observation of Broadband Extraordinary Transmission at the Plasmonic Brewster Angle in Metallic Gratings(OSA Publishing, 2011) Bloemer, M.J.; Akozbek, N.; Trimm, R.H.; D’Aguanno, G.; Mattiucci, N.Extraordinary transmission through thick gratings results from Fabry-Perot resonances inside the apertures and is narrowband. We report observation of extremely broadband transmission through thick gratings at angles of incidence related to a plasmonic Brewster’s angle.Item Nonlinear Pulse Propagation Phenomena in 1D Photonic Crystals(SPIE, 2002-06) Centini, M.; D'Aguanno, G.; Scalora, M.; Sibilia, C.; Bloemer, M.J.; Bowden, C.M.; Bertolotti, M.We numerically investigate nonlinear pulse propagation in finite, 1-d photonic crystals, and highlight novel properties that may help pave the way to a new class of high-efficiency nano-devices. We show that phase matching conditions for multiple wavelength generation and interactions can be achieved by judiciously combining material's index dispersions and geometrical features. We also show that enhanced nonlinear interactions can occur with efficiencies three orders of magnitude larger with respect to bulk materials having the same lengths and nonlinearity. Finally, we suggest potential applications as miniaturized second and third harmonic generators, nonlinear mirrors, parametric amplifiers, and optical switchers.Item Quadratic Interactions in Finite, One-Dimensional, Photonic Band Gap Structures with Deep Gratings: beyond the Undepleted Pump Regime(University of Warsaw, 2003) D'Aguanno, G.; Centini, M.; Scalora, M.; Sibilia, C.; Bertolotti, M.; Bowden, Ch.M.; Bloemer, M.J.We theoretically study quadratic interactions in finite, one-dimensional, photonic band gap structures with deep gratings, under strong pumping and global phase matching conditions. For second harmonic generation, we find that above a certain input intensity a dynamics reminiscent of a competitive, multi-wave mixing process takes hold: the pump field is mostly reflected, revealing a novel type of optical limiting behavior, while forward and backward generation is generally balanced. We also study the case of parametric down-conversion, where an intense second harmonic signal is injected in order to control a much weaker fundamental beam. Our results reveal the onset of a new process that has no counterpart in bulk materials: both transmission and reflection display an unexpected, unusual, resonance-like effect as functions of input second harmonic power.Item TE and TM guided modes in air through a negative index material waveguide(IEEE, 2006-01-10) Aguanno, G.D.; Mattiucci, N.; Scalora, M.; Bloemer, M.J.We demonstrate that a planar waveguide with an air core and a negative index material cladding can support both transverse electric (TE) and transverse magnetic (TM) guided modes with low losses.Item Trapping and storing light in /spl chi//sup (2)/ photonic crystals(IEEE, 2004-04-05) D'Aguanno, G.; Centini, M.; Scalora, M.; Sibilia, C.; Bertolotti, M.; Fazio, E.; Bowden, C.M.; Bloemer, M.J.A study of parametric down-conversion in photonic crystals reveals that the probe field can be slowed down to 11 m/s: i.e. a tunneling velocity previously reported only for coherently resonant interactions in Bose-Einstein condensates.Item Tunable, narrow-band, all-metallic microwave absorber(AIP publishing, 2012-10-04) Mattiucci, N.; Trimm, R.; D’Aguanno, G.; Aközbek, N.; Bloemer, M.J.We exploit the metamaterial properties of a thick metallic grating with extreme sub-wavelength slits on a metallic slab to achieve complete absorption of transverse magnetic polarized microwaves. We measure narrow bands of total absorption (up to 99.9999%) from normal to grazing incidence that can be tuned by varying an air gap between the grating and the slab. Unlike typical absorbers, the structure is mostly metallic with a 97% filling factor, and no absorptive material beside the metal itself is employed. We access the absorption properties of metals in the microwave where they are commonly believed to be perfect reflectors.Item UV-SERS Assisted by Nano-Focusing in Plasmonic Gratings with Tapered Slits(OSA Publishing, 2012) D’Aguanno, G.; Mattiucci, N.; Butun, S.; Callahan, J. M.; Everitt, H. O.; Aydin, K.; Bloemer, M.J.The potential for UV-SERS is demonstrated using subwavelength Al gratings grown on sapphire substrate. The role played by the slit geometry and analyte coverage is explored, demonstrating that enhancement factors greater than 100,000 are possible.