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dc.contributor.authorSokolovski, D.
dc.contributor.authorAkhmatskaya, E. 
dc.date.accessioned2017-02-21T08:16:49Z
dc.date.available2017-02-21T08:16:49Z
dc.date.issued2012-12-31
dc.identifier.isbn978-3-95-035370-9
dc.identifier.urihttp://hdl.handle.net/20.500.11824/425
dc.description.abstractWe analyse the reshaping mechanism leading to apparently 'superluminal' advancement of a pulse traversing an undersized section of a waveguide. For frequencies below the first inelastic threshold (cut off one), there are only evanescent modes in the narrow region, and the problem becomes similar to quantum mechanical tunnelling across an effective rectangular 'barrier'. In the coordinate representation, the barrier is shown to act as an effective beamsplitter, recombining envelopes of the freely propagating pulse with various spacial shifts. Causality ensures that none of the constituent envelopes are advanced with respect to free propagation, yet the resulting pulse is advanced due to a peculiar interference effect, similar to the one responsible for 'anomalous' values which occur in Aharonov's 'weak measurements'. In the momentum space, the effect is understood as a bandwidth phenomenon, where the incident pulse probes local, rather than global, analytical properties of the transmission amplitude T(p). The advancement is achieved when T(p) mimics locally an exponential behaviour, similar to the one occurring in Berry's 'superoscillations'.
dc.formatapplication/pdf
dc.language.isoengen_US
dc.rightsReconocimiento-NoComercial-CompartirIgual 3.0 Españaen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/es/en_US
dc.subjectApparent 'superluminality'
dc.subjectThe Hartman effect
dc.subjectWave propagation
dc.titleCausality, 'superluminality', and reshaping in undersized waveguides
dc.typeinfo:eu-repo/semantics/conferenceObjecten_US
dc.relation.publisherversionhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84871638254&partnerID=40&md5=0827cadce20e9df5aed6471135d96074
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessen_US
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersionen_US
dc.journal.titleECCOMAS 2012 - European Congress on Computational Methods in Applied Sciences and Engineering, e-Book Full Papersen_US


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