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Title: Photonic bandgap narrowing in conical hollow core Bragg fibers

Abstract

We 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 chemicalmore » sensing applications.« less

Authors:
; ;  [1];  [1]
  1. UNAM-National Nanotechnology Research Center, Bilkent University, 06800 Ankara (Turkey)
Publication Date:
OSTI Identifier:
22310859
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTRA; BRAGG REFLECTION; CLADDING; DIELECTRIC MATERIALS; FIBERS; LAYERS; REDUCTION; REFLECTION; SIMULATION; THICKNESS; TRANSMISSION; VISIBLE RADIATION; WAVEGUIDES; WAVELENGTHS

Citation Formats

Ozturk, Fahri Emre, Yildirim, Adem, Kanik, Mehmet, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Bayindir, Mehmet, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, and Department of Physics, Bilkent University, 06800 Ankara. Photonic bandgap narrowing in conical hollow core Bragg fibers. United States: N. p., 2014. Web. doi:10.1063/1.4893594.
Ozturk, Fahri Emre, Yildirim, Adem, Kanik, Mehmet, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Bayindir, Mehmet, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, & Department of Physics, Bilkent University, 06800 Ankara. Photonic bandgap narrowing in conical hollow core Bragg fibers. United States. https://doi.org/10.1063/1.4893594
Ozturk, Fahri Emre, Yildirim, Adem, Kanik, Mehmet, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, Bayindir, Mehmet, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara, and Department of Physics, Bilkent University, 06800 Ankara. 2014. "Photonic bandgap narrowing in conical hollow core Bragg fibers". United States. https://doi.org/10.1063/1.4893594.
@article{osti_22310859,
title = {Photonic bandgap narrowing in conical hollow core Bragg fibers},
author = {Ozturk, Fahri Emre and Yildirim, Adem and Kanik, Mehmet and Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara and Bayindir, Mehmet and Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Ankara and Department of Physics, Bilkent University, 06800 Ankara},
abstractNote = {We 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.},
doi = {10.1063/1.4893594},
url = {https://www.osti.gov/biblio/22310859}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 7,
volume = 105,
place = {United States},
year = {Mon Aug 18 00:00:00 EDT 2014},
month = {Mon Aug 18 00:00:00 EDT 2014}
}