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  Helically twisted photonic crystal fibres

Russell, P. S. J., Beravat, R., & Wong, G. K. L. (2017). Helically twisted photonic crystal fibres. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 375(2087): 20150440. doi:10.1098/rsta.2015.0440.

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Russell, P. St. J.1, Autor           
Beravat, Ramin1, 2, Autor           
Wong, G. K. L.1, Autor           
Affiliations:
1Russell Division, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364721              
2International Max Planck Research School, Max Planck Institute for the Science of Light, Max Planck Society, Staudtstraße 2, 91058 Erlangen, DE, ou_2364697              

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Schlagwörter: ORBITAL-ANGULAR-MOMENTUM; POLARIZATION MODE-DISPERSION; BIREFRINGENT OPTICAL-FIBERS; CIRCULAR BIREFRINGENCE; SENSORS; GRATINGS; LIGHTScience & Technology - Other Topics; chirality; photonic crystal fibres; optical activity; orbital angular momentum; helical Bloch waves; Faraday effect;
 Zusammenfassung: Recent theoretical and experimental work on helically twisted photonic crystal fibres (PCFs) is reviewed. Helical Bloch theory is introduced, including a new formalism based on the tight-binding approximation. It is used to explore and explain a variety of unusual effects that appear in a range of different twisted PCFs, including fibres with a single core and fibres with N cores arranged in a ring around the fibre axis. We discuss a new kind of birefringence that causes the propagation constants of left-and rightspinning optical vortices to be non-degenerate for the same order of orbital angular momentum (OAM). Topological effects, arising from the twisted periodic 'space', cause light to spiral around the fibre axis, with fascinating consequences, including the appearance of dips in the transmission spectrum and low loss guidance in coreless PCF. Discussing twisted fibres with a single off-axis core, we report that optical activity in a PCF is opposite in sign to that seen in a step-index fibre. Fabrication techniques are briefly described and emerging applications reviewed. The analytical results of helical Bloch theory are verified by an extensive series of 'numerical experiments' based on finite-element solutions of Maxwell's equations in a helicoidal frame. This article is part of the themed issue 'Optical orbital angular momentum'.

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Sprache(n): eng - English
 Datum: 2017
 Publikationsstatus: Online veröffentlicht
 Seiten: 18
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: ISI: 000393396500008
DOI: 10.1098/rsta.2015.0440
 Art des Abschluß: -

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Titel: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND : ROYAL SOC
Seiten: - Band / Heft: 375 (2087) Artikelnummer: 20150440 Start- / Endseite: - Identifikator: ISSN: 1364-503X