2016/04/11 by Yu Horie, Amir Arbabi, Ehsan Arbabi +2
Engineering · Materials Science · Physics and Astronomy · #Band-pass filter #Bandwidth (computing) #Center frequency #Filter (signal processing) #Metamaterials and Metasurfaces Applications #Optical Coatings and Gratings #Optical filter #Planar #Planar array #Plasmonic and Surface Plasmon Research #Resonator #Wavelength #physics.optics
paper · pdf · doi:10.1364/oe.24.011677
arxiv created 2016/04/11 · openalex publication_date 2016/05/19 · openalex created_date 2016/06/24 · arxiv updated 2016/06/29 · openalex updated_date 2026/08/05
We propose and experimentally demonstrate a planar array of optical bandpass filters composed of low loss dielectric metasurface layers sandwiched between two distributed Bragg reflectors (DBRs). The two DBRs form a Fabry-Pérot resonator whose center wavelength is controlled by the design of the transmissive metasurface layer which functions as a phase shifting element. We demonstrate an array of bandpass filters with spatially varying center wavelengths covering a wide range of operation wavelengths of 250nm around λ = 1550nm (Δλ/λ = 16%). The center wavelengths of each filter are independently controlled only by changing the in-plane geometry of the sandwiched metasurfaces, and the experimentally measured quality factors are larger than 700. The demonstrated filter array can be directly integrated on top of photodetector arrays to realize on-chip high-resolution spectrometers with free-space coupling.