Journal
ADVANCED OPTICAL MATERIALS
Volume 6, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201800515
Keywords
laser writing; nematic liquid crystals; polymer structures; QR codes
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Funding
- Engineering Physical Sciences Research Council UK [EP/L505584/1, EP/N509711/1]
- Merck Chemicals Ltd.
- Royal Society
- John Fell Fund (Oxford)
- Leverhulme Trust
- Slovenian Research Agency Grant [J1-7300, L1-8135, P1-0099]
- US Air Force Office of Scientific Research, European Office of Aerospace Research and Development [FA9550-15-1-0418, 15IOE028]
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Two-photon laser writing is a powerful technique for creating intricate, high resolution features in polymerizable materials. Here, using a single-step process to microfabricate polymer inclusions, the ability to generate read-on-demand images and identification codes in a liquid crystal (LC) device is demonstrated. These micrometer-sized polymer features are encoded directly into LC devices using direct laser writing, which locks-in the local molecular orientation at the moment of fabrication. By reading the devices with the same voltage amplitude that is used to write the polymer structures, features can be made to disappear as the director profile becomes homogeneous with the surrounding regions, effectively cloaking the structure for both polarized and unpolarized light. It is shown how this process can be used to create micrometer-scale reconfigurable emoticons and quick-response codes within a fully assembled LC device, with potential use in authenticity and identification applications.
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