Photonic bandgap narrowing in conical hollow core Bragg fibers

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buir.contributor.authorBayındır, Mehmet
dc.citation.epage71102-5en_US
dc.citation.issueNumber7en_US
dc.citation.spage71102en_US
dc.citation.volumeNumber105en_US
dc.contributor.authorOzturk, F. E.en_US
dc.contributor.authorYildirim, A.en_US
dc.contributor.authorKanik, M.en_US
dc.contributor.authorBayındır, Mehmeten_US
dc.date.accessioned2015-07-28T12:02:22Z
dc.date.available2015-07-28T12:02:22Z
dc.date.issued2014en_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.description.abstractWe report the photonic bandgap engineering of Bragg fibers by controlling the thickness profile of the fiber during the thermal drawing. Conical hollow core Bragg fibers were produced by thermal drawing under a rapidly alternating load, which was applied by introducing steep changes to the fiber drawing speed. In conventional cylindrical Bragg fibers, light is guided by omnidirectional reflections from interior dielectric mirrors with a single quarter wave stack period. In conical fibers, the diameter reduction introduced a gradient of the quarter wave stack period along the length of the fiber. Therefore, the light guided within the fiber encountered slightly smaller dielectric layer thicknesses at each reflection, resulting in a progressive blueshift of the reflectance spectrum. As the reflectance spectrum shifts, longer wavelengths of the initial bandgap cease to be omnidirectionally reflected and exit through the cladding, which narrows the photonic bandgap. A narrow transmission bandwidth is particularly desirable in hollow waveguide mid-infrared sensing schemes, where broadband light is coupled to the fiber and the analyte vapor is introduced into the hollow core to measure infrared absorption. We carried out sensing simulations using the absorption spectrum of isopropyl alcohol vapor to demonstrate the importance of narrow bandgap fibers in chemical sensing applications.en_US
dc.description.provenanceMade available in DSpace on 2015-07-28T12:02:22Z (GMT). No. of bitstreams: 1 8195.pdf: 2200665 bytes, checksum: 2cee8caa4598da2ff2e9ca41b824465b (MD5)en
dc.identifier.doi10.1063/1.4893594en_US
dc.identifier.issn0003-6951
dc.identifier.urihttp://hdl.handle.net/11693/12652
dc.language.isoEnglishen_US
dc.publisherAIP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1063/1.4893594en_US
dc.source.titleApplied Physics Lettersen_US
dc.subjectWave-guidesen_US
dc.subjectBroad-banden_US
dc.subjectTransmissionen_US
dc.titlePhotonic bandgap narrowing in conical hollow core Bragg fibersen_US
dc.typeArticleen_US

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