<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Wuestner, S.</style></author><author><style face="normal" font="default" size="100%">Kirby, E.I.</style></author><author><style face="normal" font="default" size="100%">Pusch, A.</style></author><author><style face="normal" font="default" size="100%">K. L. Tsakmakidis</style></author><author><style face="normal" font="default" size="100%">Hamm, J.M.</style></author><author><style face="normal" font="default" size="100%">Hess, O.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Gain in negative-index metamaterials and slow-light waveguides</style></title><secondary-title><style face="normal" font="default" size="100%">Proceedings of SPIE - The International Society for Optical Engineering</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.scopus.com/inward/record.uri?eid=2-s2.0-79751520302&amp;doi=10.1117%2f12.871948&amp;partnerID=40&amp;md5=4b895df0b6f659a9a30aaeffe92fefcf</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">7754</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We investigate on the basis of a full three-dimensional spatio-temporal Maxwell-Bloch approach the possibility of complete loss compensation in non-bianisotropic negative refractive index (NRI) metamaterials. We show that a judicious incorporation of optically pumped gain materials, such as laser dyes, into a double-fishnet metamaterial can enable gain in the regime where the real part n′ of the resulting effective refractive index (n = n′ + in″) is negative. It is demonstrated that a frequency band exists for realistic opto-geometric and material (gain/loss) parameters where n′ &lt; 0 and simultaneously n″ &lt; 0 hold, resulting in a figure-of-merit that diverges at two distinct frequency points. Having ensured on the microscopic, meta-molecular level that realistic levels of losses and even gain are accessible in the considered optical frequency regime we explore the possibility of compensating propagation losses in a negative refractive index slow-light metamaterial heterostructure. The heterostructure is composed of a negative refractive index core-layer bounded symmetrically by two thin active cladding layers providing evanescent gain to the propagating slow light pulses. It is shown that backward-propagating light - having anti-parallel phase and group velocities and experiencing a negative effective refractive index - can be amplified inside this slow-light waveguide structure. Our results provide a direct and unambiguous proof that full compensation of losses and attainment of gain are possible on the microscopic as well as the macroscopic level in the regime where the non-bianisotropic refractive index is negative - including, in particular, the regime where the guided light propagates slowly. © 2010 SPIE.</style></abstract><notes><style face="normal" font="default" size="100%">cited By 0</style></notes></record></records></xml>