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SEM images of the micropatterned POFs. (a) Angled view of patterned POFs made of SiO2@PMMA@PEA, scale bar is 100 μm. (b-c) Magnified views of framed regions in (a): Cross-section of (b) squeezed (I), (c) sheared (II), and (d) imprinted (III) regions. All scale bars are 1 μm.
