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. 2025 Jun 25;16(7):747. doi: 10.3390/mi16070747

Figure 2.

Figure 2

Hollow core PCF-SPR sensors. (a) Ag-coated dual lattice of hexagonal and octagonal air holes [123]. (b) Au-coated elliptical and circular air hole PCF [124]. (c) Octagonal lattice of three-dimensional air holes [125]. (d) Au-coated hexagonal lattice of air holes [126]. (e) represents the behavior of CL for analyte RI varying in the RI range of 1.33–1.37 RIU for the sensor model presented in (a) [123]. (f) represents the AS behavior for RI ranging from 1.33–1.37 RIU for the sensor model presented in (a) [123].