Fig. 2: Working principle, simulation and calculation results of the MEMS-tunable phase shifter.

a Working principle of the MEMS-tunable phase shifter. b Simulated optical response of the MEMS-tunable phase shifter versus lateral gap (insets: mode profiles at 50 and 200 nm lateral gaps). c Simulated resonance frequency of MEMS-tunable phase shifter. d Calculated voltage versus displacement of the lateral comb actuator