Ontology type: schema:ScholarlyArticle
2018-11
AUTHORSS. A. Nazarov
ABSTRACTAnomalies of the diffraction pattern at near-threshold frequencies of the continuous spectrum of a cylindrical quantum waveguide with regular (smooth gentle) or singular (small cavities and bumps) perturbations of the boundary are studied. Wood anomalies are characterized by rapid variations in the scattering matrix near the thresholds. Conditions under which a Wood anomaly is absent, appears, and enhances are obtained by constructing asymptotics of solutions to the Dirichlet problem for the Helmholtz equation. The results are obtained by analyzing an artificial object—the augmented scattering matrix—and involve only operations with real values of the spectral parameter, but the relation between Wood anomalies and complex resonance points is also considered. Generated by almost standing waves, threshold resonances that cause near-threshold anomalies of other types are discussed. More... »
PAGES1838-1855
http://scigraph.springernature.com/pub.10.1134/s096554251811009x
DOIhttp://dx.doi.org/10.1134/s096554251811009x
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