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Schematics (not to the scale) of DLSPPWs: (a) line-coupler and (c) 3 dB splitter. LRM images of (b) line couplers, with gap separation ranging from 100 to 500 nm, and (d) 3 dB power splitters, with gap separation ranging from 100 to 600 nm. The width of the DLSPPWs was kept constant, .
Line profiles and fittings to the data using Eq. (1) of the line-coupler and 3 dB splitters ( and ) shown in Figs. 1(b) and 1(d), respectively.
Schematics (not to the scale) of DLSPPWs: (a) racetrack resonator and (c) signal drop filter. LRM images of (b) racetrack resonator and (d) signal drop filter. On both devices, the gap separations between straight waveguides and racetrack resonators were kept fixed at .
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