Helically twisted photonic crystal fibres

Russell, P. St. J.; Beravat, R.; Wong, G. K. L.

doi:10.1098/rsta.2015.0440

Cited by 115 publications

(59 citation statements)

References 38 publications

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“…The idea of twisting fiber structures is very interesting because it enables creating modes with an orbital angular momentum (OAM) 17,18,19 and controlling the state of polarization and the fiber's optical activity. 20,21 It should be kept in mind that in order to obtain any effect, the fiber to be twisted cannot be cylindrically symmetric.…”

Section: Introductionmentioning

confidence: 99%

“…18,22,23 Both methods result in a permanent twist of the fiber and the twist occurs at high temperatures where the material viscosity is low. When in a solid state, mechanical, and therefore reversible, twist of silica fibers cannot be used to produce twist rates high enough to achieve the desired properties, 17,18,19,20,21,22,23 because of the inherent material stiffness. Moreover, even when fabricated with a permanent deformation, these twisted structures have been realized only in the optical domain and only theoretically suggested in the THz, once more because of the combination of size and necessary deformation required to achieve structures showing interesting properties.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

2018

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THz radiation is more and more commonplace in research laboratories as well as in everyday life, with applications ranging from body scanners at airport security to short range wireless communications. In the optical domain, waveguides and other devices to manipulate radiation are well established. This is not yet the case in the THz regime because of the strong interaction of THz radiation with matter, leading to absorption, and the millimeter size of the wavelength and therefore of the required waveguides. We propose the use of a new material, polyurethane, for waveguides that allows high flexibility, overcoming the problem that large sizes otherwise result in rigid structures. With this material we realize antiresonant hollow-core waveguides and we use the flexibility of the material to mechanically twist the waveguide in a tunable and reversible manner, with twist periods as short as tens of wavelengths. Twisting the waveguide, we demonstrate the generation of modes carrying orbital angular momentum. We use THz time domain spectroscopy to measure and clearly visualize the vortex nature of the mode, which is difficult in the optical domain. The proposed waveguide is a new platform offering new perspectives for THz guidance and particularly mode manipulation. The demonstrated ability to generate modes with orbital angular momentum within a waveguide, in a controllable manner, will be beneficial to both fundamental, e.g. matter-radiation interaction, and applied, e.g. THz telecommunications, advances of THz research and technology. Moreover, this platform is not limited to the THz domain and could be scaled for other electromagnetic wavelengths.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

2018

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“…These aspects are represented by papers dealing with the use of OAM beams for free-space communication [52] and propagation through photonic crystal fibres [53].…”

Section: Recent Developments and This Theme Issuementioning

confidence: 99%

Optical orbital angular momentum

Barnett

Babiker

Padgett

2017

Phil. Trans. R. Soc. A.

113

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We present a brief introduction to the orbital angular momentum of light, the subject of our theme issue and, in particular, to the developments in the 13 years following the founding paper by Allen et al. (Allen et al. 1992 Phys. Rev. A 45 , 8185 ( doi:10.1103/PhysRevA.45.8185 )). The papers by our invited authors serve to bring the field up to date and suggest where developments may take us next. This article is part of the themed issue ‘Optical orbital angular momentum’.

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“…Twisting the fibre ring also allows these resonant frequrncies to be tailored. Our results could be also be useful to researchers working on twisted solid-core and hollow-core photonic crystal fibres [13,42]…”

Section: Discussionmentioning

confidence: 80%

Angular momentum supercontinuum from fibre rings

Maitland¹,

Biancalana

2019

J. Opt.

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Broadband, coherent light carrying optical angular momentum is of potential utility for a variety of classical and quantum communication applications, but at present few such sources exist. We study the generation of supercontinua in a ring array of coupled optical fibres. Short pulses carrying discrete angular momentum undergo soliton fission, spontaneously breaking azimuthal symmetry. This results in a train of pulses with a broadband frequency spectrum as well as a non-trivial angular momentum distribution. These spatio-temporal solitary waves, localised around a single fibre core, emit an unusual form of resonant radiation which can be present even in the absence of intrinsic higher order dispersion, being induced by the lattice dispersion of the ring array. We explore how the coupling properties between fibre cores affect the resulting supercontinuum, in particular how mildly twisting the array can effectively manipulate its angular momentum content and resonant frequencies through the induced Peierls phase.

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Helically twisted photonic crystal fibres

Cited by 115 publications

References 38 publications

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

Terahertz orbital angular momentum modes with flexible twisted hollow core antiresonant fiber

Optical orbital angular momentum

Angular momentum supercontinuum from fibre rings

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