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

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 tra...

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Bibliographic Details
Published in:Optics express 2016-05, Vol.24 (11), p.11677-11682
Main Authors: Horie, Yu, Arbabi, Amir, Arbabi, Ehsan, Kamali, Seyedeh Mahsa, Faraon, Andrei
Format: Article
Language:English
Subjects:
chip
MATERIALS SCIENCE
metamaterials
microspectrometer
optical filter
silicon
spectrometer
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.011677