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. 2022 Oct 4;12:e00368. doi: 10.1016/j.ohx.2022.e00368

Fig. 20.

Fig. 20

Intensity of crimson beads at different modes (angles) of single-mode fiber (SMF) excitation. A)Epi (0–70 DU). B) Critical angle (0–160 DU). C) Maximal angle (0–40 DU). D) Barchart showing mean intensity (5003.7 ± 612.1 a.u.; 13843.8 ± 666.9 a.u.;179.7 ± 5.6 a.u.) of crimson beads. E) Angle of incidence and penetration depth dependence for 638 nm wavelength. According to calculations, the critical angle was at 61.20° for 638 nm wavelength excitation, and the maximal angle was estimated to be ∼78.6°.