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We propose and experimentally demonstrate a planar array of optical bandpassfilters composed of low loss dielectric metasurface layers sandwiched betweentwo distributed Bragg reflectors (DBRs). The two DBRs form a Fabry-P\'erotresonator whose center wavelength is controlled by the design of thetransmissive metasurface layer which functions as a phase shifting element. Wedemonstrate an array of bandpass filters with spatially varying centerwavelengths covering a wide range of operation wavelengths of 250 nm around{\lambda} = 1550 nm ({\Delta}{\lambda}/{\lambda} = 16%). The center wavelengthsof each filter are independently controlled only by changing the in-planegeometry of the sandwiched metasurfaces, and the experimentally measuredquality factors are larger than 700. The demonstrated filter array can bedirectly integrated on top of photodetector arrays to realize on-chiphigh-resolution spectrometers with free-space coupling.

Wide bandwidth and high resolution planar filter array based on DBR-metasurface-DBR structures