Pitch-Switchable Metalens Array for Wavefront Profiling at Multiwavelength

doi:10.1002/adom.202302934

2024-03-14

PRE

DOI：10.1002/adom.202302934

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The wavefront sensor is a crucial component in the adaptive optics system (AOS), responsible for detecting aberrated wavefronts. However, The Shack-Hartmann wavefront sensor with single-pitch microlens array is limited in its adaptability to different observing conditions, affecting wavefront reconstruction accuracy. And conventional microlens arrays are wavelength-specific. Here, a polarization-dependent pitch-switchable metalens array based on non-interleaved silicon metasurfaces is proposed, capable of working at multiple wavelengths. By controlling the incident and outgoing light polarization, three metalens arrays with customized pitches can be switched at will. Furthermore, achromatic performance is achieved in the 950 nm and 1030 nm wavelengths through structural dispersion engineering. Finally, wavefront detection experiments are finally conducted to demonstrate the phase reconstruction with variable spatial resolution. The metalens array with high flexibility in wavefront sensor can further enhance the adaptability of AOS and has great potential for applications in light-field imaging, and machine vision, etc. This work introduces a polarization-dependent pitch-switchable metalens array for adaptive optics systems. Addressing limitations of conventional microlens arrays, it achieves adaptability across multiple wavelengths and achromatic performance via structural dispersion engineering. Experimental results demonstrate phase reconstruction with variable spatial resolution, enhancing adaptability for diverse applications in light-field imaging and machine vision. image

Keyword:

adjustable pitch

metalens array

metasurface

multiwavelength multiplexing

Shack-Hartmann wavefront sensor