| Citation: | HU Jin-gao-wa, ZHAO Shang-nan, WANG Ling-jie, YE Hao-kun, ZHANG Jian-ping, ZHANG Xin. Design and characteristic analysis of off-axis meta-lens[J].Chinese Optics.doi:10.37188/CO.2023-0039
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As a new type of planar optical element, meta-lens can flexibly control the phase, polarization and amplitude of light. They have great potential for device lightweighting and mass manufacturing, and have garnered widespread attention. Off-axis meta-lens, a special type of meta-lens with certain dispersion effect, can be used as a spectral element, providing a unique and feasible way to realize micro instruments. This paper proposes a design method for off-axis meta-lens and analyzes the effects of numerical aperture, off-axis angle, and incident wavelength on the simulation deviation, resolution and focusing efficiency of off-axis meta-lenses, which provides valuable insights for subsequent research and application of off-axis meta-lenses.
Several off-axis meta-lenses with parameters
The simulation results indicate that the off-axis angle is directly proportional to the spectral resolution. As the angle increases, t the spectral resolution becomes larger, but the focusing efficiency decreases. A smaller numerical aperture result in a smaller coverage of the phase distribution, leading to a larger deviation between the simulation and theory.
Designers need to reasonably balance parameters such as numerical aperture and off-axis angle according to the requirements to finally achieve the desired effect. The conclusion of this study is an important reference value for theoretical analysis and parameter design of off-axis meta-lens in practical application.
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