Numerous living organisms possess biophotonic nanostructures that provide colouration and other diverse functions for survival. While such structures have been actively studied and replicated in the laboratory, it remains unclear whether they can be used for biomedical applications. Here, we show a transparent photonic nanostructure inspired by the longtail glasswing butterfly (Chorinea faunus) and demonstrate its use in intraocular pressure (IOP) sensors in vivo. We exploit the phase separation between two immiscible polymers (poly(methyl methacrylate) and polystyrene) to form nanostructured features on top of a Si3N4 substrate. The membrane thus formed shows good angle-independent white-light transmission, strong hydrophilicity and anti-biofouling properties, which prevent adhesion of proteins, bacteria and eukaryotic cells. We then developed a microscale implantable IOP sensor using our photonic membrane as an optomechanical sensing element. Finally, we performed in vivo testing on New Zealand white rabbits, which showed that our device reduces the mean IOP measurement variation compared with conventional rebound tonometry without signs of inflammation.
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The work was funded by the National Institute of Health (NIH) research grant EY024582 to H.C. and D.S., a HMRI Investigator Award, Caltech CI2 programme, Powell Foundation Award to H.C., and a Research To Prevent Blindness Innovation Award to D.S. Imaging was performed in the Biological Imaging Facility, with the support of the Caltech Beckman Institute and the Arnold and Mabel Beckman Foundation. We acknowledge support from the Beckman Institute of the California Institute of Technology to the Molecular Materials Research Center.
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Scientific Reports (2019)
Nature Nanotechnology (2018)
A review on the progress of nanostructure materials for energy harnessing and environmental remediation
Journal of Nanostructure in Chemistry (2018)