Fig. 1. Structure of one-dimensional photonic crystal filter

Fig. 2. Dispersion curves. (a) Dispersion curves of Si; (b) refractive index curve of SiO₂

Fig. 3. Transmission curves under different N. (a) Transmissivity under different N; (b) enlarged view of dashed frame area

Fig. 4. Transmission curves at different voltage differences

Fig. 5. Transmissivity at different air thicknesses

Fig. 6. Distribution of two peaks in transmission curves when U₁=0-50 V and U₂=0-50 V

Fig. 7. Schematic of tunable range for finding one transmission peak when the other peak is fixed to 1510 nm

Fig. 8. Flow chart of genetic algorithm. (a) Flow chart; (b) cross operation; (c) mute operation

Fig. 9. Simulation results of target peaks at 1510 nm and 1588 nm. (a) Transmission curve; (b) fitness function values versus generation numbers; (c) distribution of electric field

Fig. 10. Simulation results when target wavelengths are (1515 nm, 1595 nm) and (1520 nm, 1599 nm). (a) Change in fitness function values with generation numbers for two sets of target peaks wavelengths; (b) transmissivity of target peak wavelengths at (1515 nm, 1595 nm); (c) transmissivity of target peak wavelengths at (1520 nm, 1599 nm)