Browsing by Author "Bowden, C.M."
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Item Dispersive properties of one-dimensional photonic band gap structures for second harmonic generation(IOP Publishing, 2000-03-01) Centini, M.; Scalora, M.; Sibilia, C.; D'Aguanno, G.; Bertolotti, M.; Bloemer, M. J.; Bowden, C.M.We analyse the dispersive properties of one-dimensional photonic band gap structures, and discuss applications to phase matching conditions in the case of second harmonic generation. Band edge effects such as increased density of modes, large field enhancement, and low group velocity induce highly efficient parametric amplification, provided the proper phase matching conditions can be established. Direct integration of Maxwell's equations in the time domain confirms these conclusions, and shows that parametric amplification in one-dimensional photonic band gap structures provide much larger conversion efficiencies compared with ordinary quasi-phase-matching devices.Item Efficient nonlinear infrared parametric generation in one-dimensional photonic band gap structures(Elsevier, 2001-03-05) Centini, M.; Scalora, M.; D’Aguanno, G.; Sibilia, C.; Bertolotti, M.; Bloemer, M. J.; Bowden, C.M.; Haus, J.W.Using numerical methods and the effective index approach that we recently discussed in a separate publication, we show that it is possible to obtain highly efficient, phase matched nonlinear generation of infrared (3 μm) radiation in a one-dimensional photonic band gap structure. We predict conversion efficiencies that approach pump depletion in single-pass geometry, assuming χ⁽²⁾ values of order 100 pm/V, and pump intensities of order 100 MW/cm².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 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.