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. 2017 Jan 3;12:1. doi: 10.1186/s11671-016-1773-2

Fig. 8.

Fig. 8

a Reflection spectra of the sensor with various refractive indexes of the environment. b Resonant wavelength shifts against the surrounding refractive index. Parameters: P = 1200 nm, w = 622 nm, l = 420 nm, t 1 = 328 nm, t 2 = 28 nm, and t 3 = 28 nm