Figure 6
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SEM images of microchannels. (a) A slot machined on the fiber with material removed down to the bottom surface of the hollow core [54]. (b) SEM image of a single channel cross-section [49]. (c) The core diameter of the side-drilled microchannel on the fiber is approximately 1.02 μm near the hollow core region [55]. (d) SEM images of the cleaved end of the micro-drilled optical fiber [56].
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