Kavli Affiliate: Harry A. Atwater
| First 5 Authors: Julie Belleville, Prachi Thureja, Harry A. Atwater, ,
| Summary:
We introduce a conceptual framework for a lensless imaging system which
employs an active metasurface as a high-frequency, continuously tunable
amplitude and phase modulation aperture, coupled to a discrete single-pixel
detector. Using an array factor formalism, we first study fundamental limits in
information collection, offering a comparison to existing technologies. We also
study the effects of modulation rate and losses on the system acquisition time
and signal-to-noise ratio, which place bounds on system performance for set
illumination conditions. Considering both an ideal metasurface and the phase
and amplitude modulation characteristics of an experimentally realized indium
tin oxide-based metasurface operating at 1510 nm, we then simulate image
recovery with ~60,000 image points for a 0.2 mm x 0.2 mm active metasurface
aperture. We show that aberrations appearing in the simulated images produced
by the metasurface can be corrected through post-processing. We further
investigate trade-offs between image acquisition time and image quality both
through the realization of Hadamard coupling bases and by modifying the k-space
width coupling to the detector. Finally, we discuss the technical challenges
which remain to be overcome for experimental realization of a lensless
single-pixel imaging technology.
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