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

Figure 2.

Figure 2

(a) The real and imaginary parts of the effective refractive index. (b) SPR appearance. Conditions: ra = 0.6 μm, rb = 0.2 μm, rg = 0.2 μm, and n = 1.34.