Details

Autor(en) / Beteiligte

• Lin, Zin
• Roques-Carmes, Charles
• Christiansen, Rasmus E.
• Soljačić, Marin
• Johnson, Steven G.

Titel

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

Ist Teil von

• Applied physics letters, 2021-01, Vol.118 (4)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2021

Link zum Volltext

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• We present full-Maxwell topology-optimization design of a single-piece multilayer metalens, about 10 wavelengths λ in thickness, which simultaneously focuses over a 60° 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 ∼ 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.