<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Wuestner, S.</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 and plasmon dynamics in active negative-index metamaterials</style></title><secondary-title><style face="normal" font="default" size="100%">Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.scopus.com/inward/record.uri?eid=2-s2.0-80053006023&amp;doi=10.1098%2frsta.2011.0140&amp;partnerID=40&amp;md5=d71445e1ffa51d484758b512027f58bf</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1950</style></number><volume><style face="normal" font="default" size="100%">369</style></volume><pages><style face="normal" font="default" size="100%">3525-3550</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Photonic metamaterials allow for a range of exciting applications unattainable with ordinary dielectrics. However, the metallic nature of their meta-atoms may result in increased optical losses. Gain-enhanced metamaterials are a potential solution to this problem, but the conception of realistic, three-dimensional designs is a challenging task. Starting from fundamental electrodynamic and quantum mechanical equations, we establish and deploy a rigorous theoretical model for the spatial and temporal interaction of lightwaves with free and bound electrons inside and around metallic (nano-) structures and gain media. The derived numerical framework allows us to self-consistently study the dynamics and impact of the coherent plasmon-gain interaction, nonlinear saturation, field enhancement, radiative damping and spatial dispersion. Using numerical pump-probe experiments on a double-fishnet metamaterial structure with dye molecule inclusions, we investigate the build-up of the inversion profile and the formation of the plasmonic modes in a low-Q cavity. We find that full loss compensation occurs in a regime where the real part of the effective refractive index of the metamaterial becomes more negative compared to the passive case. Our results provide a deep insight into how internal processes affect the overall optical properties of active photonic metamaterials fostering new approaches to the design of practical, loss-compensated plasmonic nanostructures. © 2011 The Royal Society.</style></abstract><notes><style face="normal" font="default" size="100%">cited By 56</style></notes></record></records></xml>