Scalora, MichaelD'Aguanno, GiuseppeBloemer, MarkCentini, Marcode Ceglia, DomenicoMattiucci, NadiaKivshar, Yuri2009-05-292010-12-202009-05-292010-12-20Optics Express 14.11 (2006): 4746-47561094-4087http://hdl.handle.net/10440/351http://digitalcollections.anu.edu.au/handle/10440/351We 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.11 pages"OSA will grant the authors permission to deposit the publisher’s pdf from their Optics Express articles into the repository with the proper citation (reference number or journal /volume/page/year citation)." - from email received from Authorized Agent, The Optical Society, 27/05/10http://dx.doi.org/10.1364/OE.14.004746Negative index materialsFrequency conversion2006-05-2910.1364/OE.14.0047462015-12-12