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arXiv · 2011.10467

Computational inverse design for ultra-compact single-piece metalenses free of chromatic and angular aberration

Zin Lin·Charles Roques-Carmes·Rasmus E. Christiansen·Marin Soljačić·Steven G. Johnson
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Abstract

We present full-Maxwell topology-optimization design of a single-piece multlayer metalens, about 10 wavelengths~$λ$ in thickness, that simultaneously focuses over a $60^\circ$ 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 absolute focusing efficiency $> 50$\%. Both 2D and 3D axi-symmetric designs are presented, optimized over $\sim 10^5$ 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 multi-functionality that can be achieved by exploiting the full wave physics of subwavelength designs, and motivate future work on design and fabrication of multi-layer meta-optics.

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Zin Lin, Charles Roques-Carmes, Rasmus E. Christiansen, Marin Soljačić, Steven G. Johnson. 2020-10-27. Computational inverse design for ultra-compact single-piece metalenses free of chromatic and angular aberration. https://doi.org/10.1063/5.0035419

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