Centre of Expertise in Photonics (CoEP)

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https://hdl.handle.net/2440/53540

Founded in early 2005, the Centre of Expertise in Photonics (CoEP) is a research initiative within the School of Chemistry & Physics at the University of Adelaide focusing on the design, fabrication and application of soft glass optical fibres.

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Browsing Centre of Expertise in Photonics (CoEP) by Author "Abbott, D."

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    Low loss, low dispersion and highly birefringent terahertz porous fibers
    (Elsevier Science BV, 2009) Atakaramians, S.; Afshar Vahid, S.; Fischer, B.; Abbott, D.; Monro, T.
    We demonstrate that porous fibers in addition to low loss and high confinement, have near zero dispersion for 0.5–1 THz resulting in reduced terahertz signal degradation compared to microwires. We also show for the first time that these new fibers can be designed, introducing asymmetrical sub-wavelength airholes within the core, to achieve high birefringence ≈0.026. This opens up the potential for realization of novel polarization preserving fibers in the terahertz regime.
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    Low loss, low dispersion T-ray transmission in Microwires
    (IEEE, 2007) Afshar Vahid, S.; Atakaramians, S.; Fischer, B.; Ebendorff-Heidepriem, H.; Monro, T.; Abbott, D.; Conference on Lasers and Electro Optics (CLEO/QELS) (29th : 2007 : Baltimore, U.S.A.)
    We present low loss, < 0.01 1/cm, and dispersion, < 10 ps/(km.nm), properties of microwires for terahertz transmission. These wires have diameters smaller than the operating wavelength, resulting in the propagation of enhanced evanescent fields. © 2007 Optical Society of America.
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    Microwire fibers for low-loss THz transmission
    (SPIE, 2007) Atakaramians, S.; Afshar Vahid, S.; Fischer, B.; Ebendorff-Heidepriem, H.; Monro, T.; Abbott, D.; Smart Structures, Devices, and Systems (3rd : 2006 : Adelaide, Australia); Al-Sarawi, S.F.
    In this paper, we will investigate microwire fibers for low-loss terahertz transmission. Microwires, air-clad wire waveguides with diameter smaller than the operating wavelength (a few μm), have an enhanced evanescent field and tight wave confinement resulting in a low loss waveguide structure for the terahertz (T-ray) frequency regime. Based on our experimental data for the bulk material absorption of four glasses (F2, SF6, SF57 and Bismuth) and a polymer (PMMA), we calculate the normalized field distribution, power fraction outside the wire and effective loss. It will be shown that regardless of material, the effective loss of all microwires converges to the same order < 0.01 cm -1.
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    Porous fibers: a novel approach to low loss THz waveguides
    (Optical Soc Amer, 2008) Atakaramians, S.; Afshar Vahid, S.; Fischer, B.; Abbott, D.; Monro, T.
    We propose a novel class of optical fiber with a porous transverse cross-section that is created by arranging sub-wavelength air-holes within the core of the fiber. These fibers can offer a combination of low transmission loss and high mode confinement in the THz regime by exploiting the enhancement of the guided mode field that occurs within these sub-wavelength holes. We evaluate the properties of these porous fibers and quantitatively compare their performance relative to that of a solid core air cladded fiber (microwire). For similar loss values, porous fibers enable improved light confinement and reduced distortion of a broadband pulse compared to microwires.
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    Porous fibre: A novel THz waveguide
    (ICE, 2008) Atakaramians, S.; Afshar Vahid, S.; Fischer, B.; Abbott, D.; Monro, T.; OECC/ACOFT 2008; Eggleton, B.
    We propose a novel class of fibre with a porous core transverse crosssection that can offer a combination of low transmission loss and high mode confinement in the THz regime.