Induced Birefringence in 3D Printing: Concealing Information Optically within Printed Objects Article Swipe
David M. Roper
,
Kyung‐Ah Kwon
,
L. Malone
,
Serena M. Best
,
Ruth E. Cameron
·
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1002/admt.202200139
YOU?
·
· 2022
· Open Access
·
· DOI: https://doi.org/10.1002/admt.202200139
This paper presents a novel method to spatially vary the intra‐layer birefringence of Fused Filament Fabricated (FFF) parts by controlling chain alignment during extrusion along individual rasters. The role of print speed, extrusion factor and layer separation on the birefringence of single PLLA layers is explored, at thicknesses ranging from 50–125 µm and print speeds 1000–6000 mm min −1 . The cumulative and subtractive effect of multiple PLLA layers are explored to elicit colours corresponding to a range of retardations, achieve complete extinction, and printing a physical Michel‐Levy chart. By increasing print speed and reducing layer separation and extrusion factor, a birefringence up to Δ n = 9 × 10 −4 could be achieved in single layers. In multi‐layer structures, retardations of 0–800 nm are demonstrated. These results suggest that spatially varied birefringence can be used to store data, text or images, which can be resolved when parts are illuminated between polarizers. This effect is utilized to present a steganographic technique embedding information within bulk printed parts. These techniques might find application in a range of printed optics and devices, where spatial control over molecular alignment and associated influence on the propagation of light is desirable, including the ability to encode information within a print.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1002/admt.202200139
- OA Status
- hybrid
- Cited By
- 3
- References
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- Related Works
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- OpenAlex ID
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All OpenAlex metadata
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https://openalex.org/W4281557189Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1002/admt.202200139Digital Object Identifier
- Title
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Induced Birefringence in 3D Printing: Concealing Information Optically within Printed ObjectsWork title
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articleOpenAlex work type
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enPrimary language
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2022Year of publication
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2022-05-26Full publication date if available
- Authors
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David M. Roper, Kyung‐Ah Kwon, L. Malone, Serena M. Best, Ruth E. CameronList of authors in order
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https://doi.org/10.1002/admt.202200139Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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hybridOpen access status per OpenAlex
- OA URL
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https://doi.org/10.1002/admt.202200139Direct OA link when available
- Concepts
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Birefringence, Polarizer, Extrusion, Materials science, Optics, Gamut, Layer (electronics), Subtractive color, Range (aeronautics), Optoelectronics, Nanotechnology, Physics, Composite materialTop concepts (fields/topics) attached by OpenAlex
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3Total citation count in OpenAlex
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2025: 1, 2024: 2Per-year citation counts (last 5 years)
- References (count)
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35Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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