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. 2022 Jul 18;22(14):5363. doi: 10.3390/s22145363

Figure 6.

Figure 6

(a) Schematic diagram of an SPR-based OFS [121]. (b) Schematic diagram of the all-encapsulated and semi-encapsulated MMZI [123]. (c) Diagram of the cascaded MZI with SF [125].