Reconstruction of guided helical bloch modes in twisted coreless photonic crystal fibre using bessel beams

Roth P, Wong GK, Frosz MH, Ahmed G, Russell PSJ (2019)

Publication Type: Conference contribution

Publication year: 2019

Publisher: Institute of Electrical and Electronics Engineers Inc.

Conference Proceedings Title: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019

Event location: Munich, DEU

ISBN: 9781728104690

DOI: 10.1109/CLEOE-EQEC.2019.8872492

Abstract

Light beams carrying orbital angular momentum (OAM) are of fundamental interest in many fields of research [1]. Recently it has been reported that helical Bloch modes (HBMs) carrying multiple values of OAM are guided in chirally twisted photonic crystal fibre (PCF), even when there is no core [2]. HBMs are not supported by conventional waveguides and would be very difficult to realise using multi-beam interference. Here we report the first complete experimental characterisation of the phase and amplitude of the complex HBM fields in twisted coreless PCF. We compare the measurements with finite element simulations, based on precise scanning electron micrographs of the fibre structure, obtaining excellent agreement. We then expand the numerically calculated HBM fields as a series of Bessel beams, allowing us to calculate the strengths and azimuthal orders of the HBM harmonics with a fidelity greater than 95%.

Authors with CRIS profile

Philip St. John Russell Lehrstuhl für Experimentalphysik (Alfried Krupp von Bohlen und Halbach-Professur)

Involved external institutions

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE)

How to cite

APA:

Roth, P., Wong, G.K., Frosz, M.H., Ahmed, G., & Russell, P.S.J. (2019). Reconstruction of guided helical bloch modes in twisted coreless photonic crystal fibre using bessel beams. In 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019. Munich, DEU: Institute of Electrical and Electronics Engineers Inc..

MLA:

Roth, P., et al. "Reconstruction of guided helical bloch modes in twisted coreless photonic crystal fibre using bessel beams." Proceedings of the 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019, Munich, DEU Institute of Electrical and Electronics Engineers Inc., 2019.

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