Achieving high numerical aperture near-infrared imaging based on an ultrathin cylinder dielectric metalens

K. F. Lin; C. C. Hsieh; S. C. Hsin; W. F. Hsieh

doi:10.1117/12.2542783

26 February 2020 Achieving high numerical aperture near-infrared imaging based on an ultrathin cylinder dielectric metalens

K. F. Lin, C. C. Hsieh, S. C. Hsin, W. F. Hsieh

Author Affiliations +

Proceedings Volume 11290, High Contrast Metastructures IX; 112901O (2020) https://doi.org/10.1117/12.2542783
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Artificial subwavelength dielectric meta-lens (ML), realization of ultrathin and light-weight, provides a potential candidate to replace traditional bulky curved lens with high image quality. A ML with 1.5 mm in diameter having numerical aperture NA ~ 0.60 at the near-infrared wavelength λ = 0.94 μm was designed by finite-difference timedomain (FDTD) method with speeding up optimization of MLs’ scheme by deep neural network (DNN) model. Additionally, an ultra-thin high NA ML was achieved by cost effective semiconductor manufacturing technology. The fabricated ML can focus an incident light down to a spot as small as ~ 5.2 μm with high optical efficiency of ~88.4% (focusing efficiency achieved 23.7%). We also provided efficient MLs’ semiconductor manufacturing technology for the development of optical device in the near-infrared image technology.

Conference Presentation

Citation Download Citation

K. F. Lin, C. C. Hsieh, S. C. Hsin, and W. F. Hsieh "Achieving high numerical aperture near-infrared imaging based on an ultrathin cylinder dielectric metalens", Proc. SPIE 11290, High Contrast Metastructures IX, 112901O (26 February 2020); https://doi.org/10.1117/12.2542783

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