Imaging Metasurfaces based on Graphene-Loaded Slot Antennas
Name
oe-29-2-1076.pdf
Description
Published version
Size
3.37 MB
Format
Adobe PDF
Checksum (MD5)
1de1d6ee4b778337af9c544d5d014f24
Author(s)
Goldstein, Jordan
Englund, Dirk
Date Issued
2021
Journal
Optics Express
Publisher
The Optical Society
Citation
Goldstein, Jordan and Englund, Dirk. 2021. "Imaging Metasurfaces based on Graphene-Loaded Slot Antennas." Optics Express, 29 (2).
Version
Final published version
Abstract
© 2021 OSA - The Optical Society. All rights reserved. Spectral imagers, the classic example being the color camera, are ubiquitous in everyday life. However, most such imagers rely on filter arrays that absorb light outside each spectral channel, yielding ∼1/N efficiency for an N-channel imager. This is especially undesirable in thermal infrared (IR) wavelengths, where sensor detectivities are low. We propose an efficient and compact thermal infrared spectral imager comprising a metasurface composed of sub-wavelength-spaced, differently-Tuned slot antennas coupled to photosensitive elements. Here, we demonstrate this idea using graphene, which features a photoresponse up to thermal IR wavelengths. The combined antenna resonances yield broadband absorption in the graphene exceeding the 1/N efficiency limit. We establish a circuit model for the antennas optical properties and demonstrate consistency with full-wave simulations. We also theoretically demonstrate ∼58% free space-To-graphene photodetector coupling efficiency, averaged over the 1050 cm-1 to 1700 cm-1 wavenumber range, for a four-spectral-channel gold metasurface with a 0.883 μm by 6.0 μm antenna pitch. This research paves the way towards compact CMOS-integrable thermal IR spectral imagers.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1364/OE.415586
