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. Author manuscript; available in PMC: 2020 Oct 9.
Published in final edited form as: Nano Lett. 2019 Oct 1;19(10):6862–6868. doi: 10.1021/acs.nanolett.9b02070

Figure 3.

Figure 3.

Imaging and optical characterization of plasmonic microneedle array. (a) Optical image of the microneedle array (scale bars are 500 and 100 μm (inset)), (b) scanning electron micrograph of the microneedle array (scale bars are 200 and 100 μm (inset)), (c) scanning electron micrograph of AuNR aggregates on the side of a microneedle tip (1 μm scale bar) with contrast-adjusted scanning electron micrograph of an individual aggregate (inset, 100 nm scale bar), (d) light extinction spectra of microneedle (MN) array with (red trace) and without (black trace) AuNRs.