Evanescent coupling between surface and linear-defect guided modes in phononic crystals

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dc.authoridCicek, Ahmet/0000-0002-7686-0045
dc.authoridSalman Durmuslar, Aysevil/0000-0001-6998-5942
dc.authoridulug, bulent/0000-0003-1744-6861
dc.authoridKAYA, Olgun Adem/0000-0002-8728-6341
dc.authorwosidCicek, Ahmet/D-5990-2012
dc.authorwosidKAYA, Olgun Adem/ABH-6274-2020
dc.authorwosidSalman Durmuslar, Aysevil/HJO-8681-2023
dc.authorwosidulug, bulent/C-2988-2016
dc.contributor.authorCicek, Ahmet
dc.contributor.authorSalman, Aysevil
dc.contributor.authorKaya, Olgun Adem
dc.contributor.authorUlug, Bulent
dc.date.accessioned2024-08-04T20:41:26Z
dc.date.available2024-08-04T20:41:26Z
dc.date.issued2016
dc.departmentİnönü Üniversitesien_US
dc.description.abstractEvanescent coupling between surface and linear-defect waveguide modes in a two-dimensional phononic crystal of steel cylinders in air is numerically demonstrated. When the ratio of scatterer radii to the lattice constant is set to 0.47 in the square phononic crystal, the two types of modes start interacting if there is one-row separation between the surface and waveguide. Supercell band structure computations through the Finite Element Method suggest that the waveguide band is displaced significantly, whereas the surface band remains almost intact when the waveguide and surface are in close proximity. The two resultant hybrid bands are such that the coupling length, which varies between 8 and 22 periods, initially changes linearly with frequency, while a much sharper variation is observed towards the top of the lower hybrid band. Such small values facilitate the design of compact devices based on heterogeneous coupling. Finite-element simulations demonstrate bilateral coupling behaviour, where waves incident from either the surface or waveguide can efficiently couple to the other side. The coupling lengths calculated from simulation results are in agreement with the values predicted from the supercell band structure. The possible utilisation of the coupling scheme in sensing applications, especially in acoustic Doppler velocimetry, is discussed.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [113F015]; TUBITAK [1929B011200102]en_US
dc.description.sponsorshipThis work is supported by The Scientific and Technological Research Council of Turkey (TUBITAK) under grant number 113F015. AS acknowledges the support from TUBITAK under grant number 1929B011200102.en_US
dc.identifier.doi10.1088/0022-3727/49/3/035103
dc.identifier.issn0022-3727
dc.identifier.issn1361-6463
dc.identifier.issue3en_US
dc.identifier.scopus2-s2.0-84954159013en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1088/0022-3727/49/3/035103
dc.identifier.urihttps://hdl.handle.net/11616/97112
dc.identifier.volume49en_US
dc.identifier.wosWOS:000368096300009en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherIop Publishing Ltden_US
dc.relation.ispartofJournal of Physics D-Applied Physicsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectphononic crystalen_US
dc.subjectsurface modeen_US
dc.subjectwaveguideen_US
dc.subjectevanescent couplingen_US
dc.subjectfinite element methoden_US
dc.titleEvanescent coupling between surface and linear-defect guided modes in phononic crystalsen_US
dc.typeArticleen_US

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