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Simple multi-wavelength imaging of birefringence:case study of silk

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Version 3 2024-06-18, 12:13
Version 2 2024-06-05, 02:22
Version 1 2019-02-18, 14:27
journal contribution
posted on 2024-06-18, 12:13 authored by R Honda, M Ryu, Jingliang LiJingliang Li, V Mizeikis, S Juodkazis, J Morikawa
Polarised light imaging microscopy, with the addition of a liquid crystal (LC) phase retarder, was used to determine the birefringence of silk fibres with high (∼1 μm) spatial resolution. The measurement was carried out with the silk fibres (the optical slow axis) and the slow axis of the LC-retarder set at parallel angles. The direct fit of the transmission data allowed for high fidelity determination of the birefringence Δn ≈ 1.63 × 10-2 (with ∼2% uncertainty) of the brown silk fibre, (Antheraea pernyi) averaged over the wavelength range λ = (425-625) nm. By measuring retardance at four separate wavelengths, it was possible to determine the true value of the birefringence of a thicker sample when an optical path may include a large number of wavelengths. The numerical procedures and required hardware are described for the do-it-yourself assembly of the imaging polariscope at a fractional budget compared to commercial units.

History

Journal

Scientific Reports

Volume

8

Article number

ARTN 17652

Pagination

1 - 9

Location

England

Open access

  • Yes

ISSN

2045-2322

eISSN

2045-2322

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, The Author(s)

Issue

1

Publisher

NATURE PUBLISHING GROUP