A Penn State-led research team has developed a flat, single-lens telescope that was able to capture clear images of the moon. Known as a metalens, it achieved far greater resolution and imaging distance than any metalens before it.
That’s what makes their advancement so exciting. For the first time, the researchers have been able to demonstrate a highly efficient, single-lens refractive metalens telescope that was able to photograph a close-up image of the moon. While not “sharp” by the standards set by current high-end optics, it is considerably more detailed than is typically expected of metalenses.
The team included a short video that showcases how its system is also able to capture closer objects with far more fidelity than most expect out of a metalens:They did this by scaling the size of their metalens up from what are typically only millimeters wide to eight centimeters in diameter , which allowed it to successfully be deployed in a larger optical system such as a telescope.
The large metalens was able to capture a clear image of the surface of the moon and achieved a greater resolution of objects that were much farther away from the metasurface than any previously developed metalens. Below is a photo of the telescope along with a diagram of how the metalens was arranged:
The results are promising, but there is still room for improvement. The team says that before its methods can be applied to modern cameras, and the expectations that come along with them, they need to address chromatic aberration issues that the lens currently suffers from. Typical optical systems correct chromatic aberration by stacking a series of differently shaped and treated lenses together, but that’s not an option for the single, flat metalens.
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