High-Efficiency, 80 mm Aperture Metalens Telescope

Area of Science:

• Optics
• Materials Science
• Astronomy

Background:

• Metalenses offer a paradigm shift for optical devices but are limited by small aperture sizes due to fabrication constraints.
• Current metalens fabrication methods restrict their use in practical large-scale optical systems like telescopes.

Purpose of the Study:

• To demonstrate a high-efficiency, single-lens, refractive metalens telescope with a large aperture.
• To develop a mass-producible fabrication workflow for wafer-scale metalenses.

Main Methods:

• Fabrication of wafer-scale (80 mm aperture) metalenses using deep-ultraviolet (DUV) photolithography.
• Characterization of metalens performance in the near-infrared region, including focal spot size and focusing efficiency.
• Construction of a single-lens telescope utilizing the fabricated metalens.

Main Results:

• Achieved nearly diffraction-limited focal spot sizes with a peak focusing efficiency of 80.84% at 1450 nm.
• Successfully built and tested a single-lens metalens telescope.
• Acquired clear images of the lunar surface, resolving geographical structures.

Conclusions:

• The developed metalens telescope demonstrates the potential of metasurfaces for large optical systems.
• This technology opens new possibilities for geosciences, planetary observation, and astrophysical science.
• Mass-producible, large-aperture metalenses are feasible and can revolutionize optical instrumentation.