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The SWG slot WGs possesses relatively higher propagation losses as compared to SWG ridge WG as can be seen from figures 3(c), (f) and (i). ovo888 slot The propagation losses for SWG ridge WG, SWG single-slot WG and SWG double-slot WG are in the range of 1 3–8 3 dB µm −1, 4 95–9 49 dB µm −1, 6 3–8 3 dB µm −1 for WG width of 150–500 nm By