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dc.contributor.authorAhmed Waseem, Waqas Waseem
dc.contributor.authorHerrero Simon, Ramon
dc.contributor.authorBotey Cumella, Muriel
dc.contributor.authorStaliunas, Kestutis
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationAhmed, W., Herrero, R., Botey, M., Staliunas, K. Axisymmetric photonic structures with PT-symmetry. A: SPIE - Active Photonic Materials VIII. "SPIE Nanoscience+ Engineering. International Society for Optics and Photonics, 2016". San Diego: International Society for Photo-Optical Instrumentation Engineers (SPIE), 2016, p. 99201U-1-99201U-8.
dc.descriptionCopyright 2016 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
dc.description.abstractPT-symmetric structures in photonic crystals, combining refractive index and gain-loss modulations is becoming a research field with increasing interest due to the light directionality induced by these particular potentials. Here, we consider PT-symmetric potentials with axial symmetry to direct light to the crystal central point obtaining a localization effect. The axial and PT-symmetric potential intrinsically generates an exceptional central point in the photonic crystal by the merge of both symmetries. This particular point in the crystal lattice causes field amplitude gradients with exponential slopes around the crystal center. The field localization strongly depends on the phase of the central point and on the complex amplitude of the PT-potential. The presented work analyzes in a first stage 1D linear PT-axisymmetric crystals and the role of the central point phase that determines the defect character, i.e. refractive index defect, gain-loss defect or a combination of both. The interplay of the directional light effect induced by the PT-symmetry and the light localization around the central point through the axial symmetry enhances localization and allows higher field concentration for certain phases. The linearity of the studied crystals introduces an exponential growth of the field that mainly depends on the complex amplitude of the potential. The work is completed by the analysis of 2D PT-axisymmetric potentials showing different spatial slopes and growth rates caused by symmetry reasons.
dc.publisherInternational Society for Photo-Optical Instrumentation Engineers (SPIE)
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshPhotonic crystals
dc.subject.lcshRefractive index
dc.subject.otherAxisymmetric photonic structures
dc.subject.otherfield localization
dc.titleAxisymmetric photonic structures with PT-symmetry
dc.typeConference report
dc.subject.lemacCristalls fotònics
dc.contributor.groupUniversitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorAhmed, W.; Herrero, R.; Botey, M.; Staliunas, K.
local.citation.contributorSPIE - Active Photonic Materials VIII
local.citation.pubplaceSan Diego
local.citation.publicationNameSPIE Nanoscience+ Engineering. International Society for Optics and Photonics, 2016

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