Figure 4 | Scientific Reports

Figure 4

From: Sensitivity-controllable refractive index sensor based on reflective θ-shaped microfiber resonator cooperated with Vernier effect

Figure 4

Typical experimental spectra and tunability of Vernier spectrum. (a) and (b) are reflection spectrum of the θ-shaped microfiber resonator with FSR 1 = 0.194 nm and the corresponded Vernier spectrum with FSR r  = 6.253 nm, respectively. (c) and (d) are reflection spectrum of the θ-shaped microfiber resonator FSR 1 = 0.196 nm and the corresponded Vernier spectrum with FSR r  = 8.917 nm, respectively.

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