Journal
APPLIED PHYSICS LETTERS
Volume 118, Issue 4, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0035419
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Funding
- Villum Fonden through the NATEC (NAnophotonics for TErabit Communications) Centre [8692]
- Danish National Research Foundation through NanoPhoton Center for Nanophotonics [DNRF147]
- U.S. Army Research Office through the Institute for Soldier Nanotechnologies [W911NF-18-2-0048]
- MIT-IBM Watson AI Laboratory [2415]
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This study presents a full-Maxwell topology-optimized design of a single-piece multilayer metalens that can simultaneously focus within a 60-degree angular range and a 23% spectral bandwidth without suffering chromatic or angular aberration. The design achieves diffraction-limited focusing and an absolute focusing efficiency of over 50% at all angles and frequencies, demonstrating ultra-compact multifunctionality. This paves the way for future work on design and fabrication of multilayer metaoptics.
We present full-Maxwell topology-optimization design of a single-piece multilayer metalens, about 10 wavelengths lambda in thickness, which simultaneously focuses over a 60 degrees angular range and a 23% spectral bandwidth without suffering chromatic or angular aberration, a plan-achromat. At all angles and frequencies, it achieves diffraction-limited focusing (Strehl ratio>0.8) and an absolute focusing efficiency of >50%. Both 2D and 3D axisymmetric designs are presented, optimized over similar to 10 5 degrees of freedom. We also demonstrate shortening the lens-to-sensor distance while producing the same image as for a longer virtual focal length and maintaining plan-achromaticity. These proof-of-concept designs demonstrate the ultra-compact multifunctionality that can be achieved by exploiting the full wave physics of subwavelength designs and motivate future work on design and fabrication of multilayer metaoptics.
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