Full-field characterization of helical Bloch modes guided in twisted coreless photonic crystal fiber

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

Publication Type: Journal article

Publication year: 2019

Journal

Optics Letters Optical Society of America

Book Volume: 44

Pages Range: 5049-5052

Journal Issue: 20

DOI: 10.1364/OL.44.005049

Abstract

It was recently reported that a photonic crystal fiber (PCF) with no structural core guides light if a permanent chiral twist is introduced by spinning the fiber preform during the draw. The intriguing guidance mechanism behind this novel effect has many remarkable features; for example, it intrinsically supports circularly polarized helical Bloch modes (HBMs) that carry multiple optical vortices, making twisted PCFs of interest in fields such as optical micro-manipulation, imaging, quantum optics, and optical communications. Here we report for the first time, to the best of our knowledge, that a twisted coreless PCF supports not just one but a family of guided HBMs, each member of which has a unique transverse field distribution and harmonic spectrum. By making detailed interferometric measurements of the near-field phase and amplitude distributions of HBMs, and expanding them as a series of Bessel beams, we are able to extract the amplitude of each azimuthal and radial HBM harmonic. Good agreement is found with the numerical solutions of Maxwell's equations. The results shed light on the properties of this curious new optical phenomenon. (C) 2019 Optical Society of America

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.L., Frosz, M.H., Ahmed, G., & Russell, P.S.J. (2019). Full-field characterization of helical Bloch modes guided in twisted coreless photonic crystal fiber. Optics Letters, 44(20), 5049-5052. https://doi.org/10.1364/OL.44.005049

MLA:

Roth, P., et al. "Full-field characterization of helical Bloch modes guided in twisted coreless photonic crystal fiber." Optics Letters 44.20 (2019): 5049-5052.

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