Materials scientists led by Cheng-Feng Pan have made significant strides in achieving high numerical aperture, broadband, and polarization-insensitive multilayer achromatic metalenses (MAMs) using a groundbreaking 3D printing approach. Traditionally, flat optics have faced challenges in balancing numerical aperture and bandwidth limitations, constraining their imaging performance.
The research team employed topology optimization and full wavelength simulations, harnessing two-photon lithography for inverse design of the metalenses. The results demonstrated impressive broadband imaging under various illuminations, showcasing the potential for multifunctional meta devices.
The breakthrough lies in the application of nanoscale 3D printing to overcome fabrication challenges associated with multilayer achromatic metalenses. The technique allowed the rapid prototyping of intricate structures, including complex microlenses and gradient index lenses. Topology optimization played a crucial role, achieving stable, multilayer, and high-resolution structures efficiently.
The multilayer achromatic metalenses exhibited unparalleled efficiency. By eliminating chromatic aberrations, these metalenses offer a new paradigm for designing and fabricating multifunctional broadband optical elements. The innovative approach opens avenues for applications in light-field imaging, bioanalysis, medicine, and quantum technologies.
Looking ahead, the research anticipates the integration of higher resolution 3D printing methods and high refractive index resins to further enhance the system’s performance. This advancement could extend the response range beyond the visible spectrum into the near or mid-infrared range, contributing to the development of a sophisticated, multifunctional optical system.
You can read the full paper, titled “3D-printed multilayer structures for high–numerical aperture achromatic metalenses” in the Science Advances journal, at this link.
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