Probing terahertz metamaterials with subwavelength optical fibers.
Transmission through a subwavelength terahertz fiber, which is positioned in parallel to a frequency selective surface, is studied using several finite element tools. Both the band diagram technique and the port-based scattering matrix technique are used to explain the nature of various resonances in the fiber transmission spectrum. First, we observe that spectral positions of most of the transmission peaks in the port-based simulation can be related to the positions of Van Hove singularities in the band diagram of a corresponding infinite periodic system. Moreover, spectral shape of most of the features in the fiber transmission spectrum can be explained by superposition of several Fano-type resonances. We also show that center frequencies and bandwidths of these resonances and, as a consequence, spectral shape of the resulting transmission features can be tuned by varying the fiber-metamaterial separation.
École Polytechnique de Montréal, Department of Engineering Physics, CP 6079, Centre-Ville Montreal, QC H3C 3A7, Canada.
Martin
M
Girard
Maksim
M
Skorobogatiy
D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008420:Manufactured Materials / Q000032:analysis*; D008422:Materials Testing / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D055053:Terahertz Radiation