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Fig. 1 | BMC Biology

Fig. 1

From: Flexible and stretchable polymer optical fibers for chronic brain and vagus nerve optogenetic stimulations in free-behaving animals

Fig. 1

Fabrication and characterizations of polymer optical fibers (POFs). A A schematic illustration of the fiber core drawing process and the coating of the cladding layer. B Optical images of the POFs. C A representative example of a swollen POF before and during stretching. D A representative image of a POF exhibiting excellent light conductivity. E The refractive index of the core (PDMS) and cladding (PVA/PAA hydrogel) of the POF (n = 6 in each group, mean ± standard deviation)

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BMC Biology

ISSN: 1741-7007

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