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dc.contributor.authorBotey Cumella, Muriel
dc.contributor.authorPradeep Kumar, Nikhil
dc.contributor.authorHerrero Simon, Ramon
dc.contributor.authorMaigyte, Lina
dc.contributor.authorStaliunas, Kestutis
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.date.accessioned2014-10-22T08:56:34Z
dc.date.available2014-10-22T08:56:34Z
dc.date.created2014
dc.date.issued2014
dc.identifier.citationBotey, M. [et al.]. Managing spatial diffraction through a periodic loss modulation. A: Photonic Crystal Materials and Devices. "Proceedings of SPIE - The International Society for Optical Engineering". Brussel·les: 2014.
dc.identifier.isbn978-162841075-4
dc.identifier.urihttp://hdl.handle.net/2117/24442
dc.description.abstractWe show that periodic distributions of gain or losses on the wavelength scale allow managing spatial diffraction of light beams, with no index contrast. It has been recently predicted that such artificial periodic structures, analogous to Photonic Crystals (PhCs), would also hold the novel spatial beam propagation effects reported for PhCs such as subdiffraction propagation, self-collimation, spatial filtering or beam focusing by a lens with flat interfaces. In particular, we consider an ideal periodic 2-dimensional (2D) arrangement of lossy cylinders embedded in air. We analytically show that this loss distribution affects diffraction. Indeed, a significant focusing behind a thin flat-flat crystal slab is observed, following the estimation of anomalous spatial dispersion for specific frequency ranges. Besides, close to the edges of the first Brillouin Zone, the light intensity map of a Gaussian beam exiting the lossy structure exhibits a high transmission windows instead of the transmission stop band expected for PhCs. This results from the strong anisotropic attenuation provided by the loss periodicity. Finally, we also consider a more realistic system with combined modulations of refractive index and losses: a 2D metallic photonic crystal (MPhC). We demonstrate that MPhCs also support selfcollimation and focusing, being such effects associated to zero and negative diffraction respectively. Finally, due to the anisotropic attenuation of light, the structure is also able to spatially filter noisy beams.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Física::Física de l’estat sòlid::Cristalls
dc.subjectÀrees temàtiques de la UPC::Física::Física de partícules::Fotons
dc.subject.lcshPhotonic crystals
dc.subject.otherDiffraction management
dc.subject.otherGain-loss modulation
dc.subject.otherMetallic photonic crystal
dc.subject.otherPhotonic crystals
dc.subject.otherScattering
dc.titleManaging spatial diffraction through a periodic loss modulation
dc.typeConference lecture
dc.subject.lemacCristalls fotònics
dc.contributor.groupUniversitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers
dc.identifier.doi10.1117/12.2051677
dc.rights.accessOpen Access
local.identifier.drac14993119
dc.description.versionPostprint (author’s final draft)
local.citation.authorBotey, M.; Kumar, N.P.; Herrero, R.; Maigyte, L.; Staliunas, K.
local.citation.contributorPhotonic Crystal Materials and Devices
local.citation.pubplaceBrussel·les
local.citation.publicationNameProceedings of SPIE - The International Society for Optical Engineering


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