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. 2015 Jan 5;5:7624. doi: 10.1038/srep07624

Figure 2. Four in-fiber air bubble samples.

Figure 2

(a) and (b) Microscope images of the created elliptical air bubbles, i.e. S1 and S3, and the created rectangular air bubbles, i.e. S2 and S4, with a cavity length of about 88, 62, 85 and 61 μm, respectively; (c) and (d) The corresponding reflection spectra of the air-cavity-based FPI samples.