Continuously Tunable Mid-Infrared Metalens Integrating Moiré and Pancharatnam-Berry Phases
Abstract
A varifocal mid-infrared metalens designed for focusing applications is proposed to integrate both Pancharatnam-Berry (PB) and Moiré pattern-based mechanisms for rotational wavefront control. The metalens employs two identical nanostructured discs featuring germanium (Ge) meta-atoms on calcium fluoride (CaF2) substrates, operating as birefringent half-wave retarders with 99.95% Polarization Conversion Ratio (PCR) and 83.65% total transmission power at 2 μm wavelength. Full-wave numerical simulations demonstrate continuous focal length tunability from 45 μm to 12 μm by rotating the second disk from 30 deg. to 120 deg., corresponding to the numerical aperture values ranging from 22.99% to 68.67%. The proposed metalens maintains reconfigurable focusing regardless of the incident light polarization, while concurrently enabling polarization-controlled operation via a phase-modulation mechanism that yields inverse responses under Right Circular Polarization (RCP) and Left Circular Polarization (LCP) illuminations.
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BibTeX
@misc{kaboutari2026continuously,
title = {{Continuously Tunable Mid-Infrared Metalens Integrating Moiré and Pancharatnam-Berry Phases}},
author = {Keivan Kaboutari and Muchuan Chen and Xiu Liu and Sheng Shen and Pedro Pinho and Stanislav Maslovski},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28389},
eprint = {2610.28389},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28389},
}
RIS
TY - UNPB
TI - Continuously Tunable Mid-Infrared Metalens Integrating Moiré and Pancharatnam-Berry Phases
AU - Keivan Kaboutari
AU - Muchuan Chen
AU - Xiu Liu
AU - Sheng Shen
AU - Pedro Pinho
AU - Stanislav Maslovski
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.28389
UR - https://arxiv.org/abs/2610.28389
AB - A varifocal mid-infrared metalens designed for focusing applications is proposed to integrate both Pancharatnam-Berry (PB) and Moiré pattern-based mechanisms for rotational wavefront control. The metalens employs two identical nanostructured discs featuring germanium (Ge) meta-atoms on calcium fluoride (CaF2) substrates, operating as birefringent half-wave retarders with 99.95% Polarization Conversion Ratio (PCR) and 83.65% total transmission power at 2 μm wavelength. Full-wave numerical simulations demonstrate continuous focal length tunability from 45 μm to 12 μm by rotating the second disk from 30 deg. to 120 deg., corresponding to the numerical aperture values ranging from 22.99% to 68.67%. The proposed metalens maintains reconfigurable focusing regardless of the incident light polarization, while concurrently enabling polarization-controlled operation via a phase-modulation mechanism that yields inverse responses under Right Circular Polarization (RCP) and Left Circular Polarization (LCP) illuminations.
ER -