Robustness of Light-Transport Processes to Bending Deformations in Graded-Index Multimode Waveguides

Dirk E. Boonzajer Flaes, Jan Stopka, Sergey Turtaev, Johannes F. De Boer, Tomáš Tyc, Tomáš ČiŽmár

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Light transport through a multimode optical waveguide undergoes changes when subjected to bending deformations. We show that optical waveguides with a perfectly parabolic refractive index profile are almost immune to bending, conserving the structure of propagation-invariant modes. Moreover, we show that changes to the transmission matrix of parabolic-index fibers due to bending can be expressed with only two free parameters, regardless of how complex a particular deformation is. We provide detailed analysis of experimentally measured transmission matrices of a commercially available graded-index fiber as well as a gradient-index rod lens featuring a very faithful parabolic refractive index profile. Although parabolic-index fibers with a sufficiently precise refractive index profile are not within our reach, we show that imaging performance with standard commercially available graded-index fibers is significantly less influenced by bending deformations than step-index types under the same conditions. Our work thus predicts that the availability of ultraprecise parabolic-index fibers will make endoscopic applications with flexible probes feasible and free from extremely elaborate computational challenges.

Original languageEnglish
Article number233901
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Volume120
Issue number23
DOIs
Publication statusPublished - 6 Jun 2018

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waveguides
fibers
refractivity
optical waveguides
profiles
matrices
availability
rods
lenses
gradients
propagation
probes

Cite this

Boonzajer Flaes, Dirk E. ; Stopka, Jan ; Turtaev, Sergey ; De Boer, Johannes F. ; Tyc, Tomáš ; ČiŽmár, Tomáš. / Robustness of Light-Transport Processes to Bending Deformations in Graded-Index Multimode Waveguides. In: Physical Review Letters. 2018 ; Vol. 120, No. 23. pp. 1-5.
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Robustness of Light-Transport Processes to Bending Deformations in Graded-Index Multimode Waveguides. / Boonzajer Flaes, Dirk E.; Stopka, Jan; Turtaev, Sergey; De Boer, Johannes F.; Tyc, Tomáš; ČiŽmár, Tomáš.

In: Physical Review Letters, Vol. 120, No. 23, 233901, 06.06.2018, p. 1-5.

Research output: Contribution to JournalArticleAcademicpeer-review

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