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. 2018 Sep 3;18(9):2922. doi: 10.3390/s18092922

Figure 4.

Figure 4

(a) Loss spectra of the same refractive index under different inner air hole radii. (b) Effects of changes in radius of inner air hole on resonance wavelength under different refractive indexes. Conditions: rb = 0.2 μm and rg = 0.2 μm.