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

Here, 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-Perot 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.
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. California Inst. of Technology, Pasadena, CA (United States). T. J. Watson Laboratory of Applied Physics
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 11; Journal ID: ISSN 1094-4087
Optical Society of America (OSA)
Research Org:
California Inst. of Technology, Pasadena, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; optical filter; microspectrometer; chip; metamaterials; spectrometer; silicon
OSTI Identifier: