Imaging from the visible to the longwave infrared wavelengths via an inverse-designed flat lens

It is generally assumed that correcting chromatic aberrations in imaging requires multiple optical elements. Here, we show that by allowing the phase in the image plane to be a free parameter, it is possible to correct chromatic variation of focal length over an extremely large bandwidth, from the visible (Vis) to the longwave infrared (LWIR) wavelengths using a single diffractive surface, i.e., a flat lens. Specifically, we designed, fabricated and characterized a flat, multi-level diffractive lens (MDL) with a thickness of

人们普遍认为，校正成像中的色差需要多个光学元件。在此，我们表明通过允许像平面中的相位为自由参数，有可能使用单个衍射表面（即平面透镜）在从可见光（Vis）到长波红外（LWIR）的极宽波段上校正焦距的色差变化。具体而言，我们设计、制作并表征了一种厚度为……的平面、多层衍射透镜（MDL）