Fig. 1. Spectral constant curves of Nb₂O₅ and SiO₂ thin films. (a) Refractive index n; (b) extinction coefficients k

Fig. 2. Designed transmittance curves of two filters. (a) 1375 nm channel; (b) 1610 nm channel

Fig. 3. Schematic DIBS experimental setup

Fig. 4. Designed and tested optical transmittance curves of 1375 nm filter. (a) Test range of 900-1800 nm;(b) test range of 1350-1400 nm

Fig. 5. Designed and tested transmittance curves of 1610 nm filter. (a) Test range of 900-1800 nm; (b) test range of 1520-1700 nm

Fig. 6. Optical microscope images of the surface of filter prepared by IBAD. (a) 1610 nm channel; (b) 1375 nm channel

Fig. 7. AFM images of the surface of filter prepared by IBAD. (a) 1610 nm channel; (b) 1375 nm channel

Fig. 8. Optical images of the surface of filter prepared by DIBS. (a) 1610 nm channel; (b) 1375 nm channel

Fig. 9. AFM images of the surface of filter prepared by DIBS. (a) 1610 nm channel; (b) 1375 nm channel

Fig. 10. Output electric signals of detector after coupling with filters. (a) 1375 nm channel; (b) 1610 nm channel