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 the metal, it achieved far greater resolution and imaging distance than any metal before it.
Instead of using multiple elements arranged in clusters how optics are currently constructed in everything from interchangeable camera lenses to smartphones a metallurgical one instead uses a flat lens surface embedded in light-manipulating metasurfaces. is covered. This method has been demonstrated in the past as capable of allowing rudimentary photography, but the quality has been significantly poorer than traditional methods. Additionally, metalens generally have very poor telephoto capabilities.
“Traditional camera or telescope lenses have curved surfaces of varying thickness, where you have a lump in the middle and thin edges, making the lens heavier and heavier,” said corresponding author Jingjie Ni, of the School of Electrical Engineering and Computer Science associate professor at Penn State, explains. “Metalens use nano-structures on the lens to contour light instead of curvature, which allows them to lay flat.”
Ni and a team of researchers recognize that despite the potential benefits of using metal optics for example, they offer the possibility of truly flat cameras that would be a huge boon for smartphones they have been quite limited to this point. Have to do
That’s what makes their advancement so exciting. For the first time, researchers have been able to demonstrate a highly efficient, single-lens refracting metalens telescope that was capable of photographing a close-up image of the Moon. While not “sharp” by the standards set by current high-end optics, it is much more detailed than what is typically expected of metals.
The team included a short video that shows how its system is able to capture close objects with far greater fidelity than most would expect from metals:
They did this by increasing the size of their metals, which are typically only millimeters wide, to eight centimeters in diameter (about four inches), allowing them to be successfully deployed in large optical systems such as telescopes. Not only were they able to increase the size of the metals, they were also able to develop a manufacturing method that was simple enough that it could be mass-produced.
The large metal detector was able to capture a clearer image of the Moon’s surface and obtained greater resolution of objects that were farther from the metasurface than any previously developed metal detector. Below is a photo of the telescope as well as an illustration of how the metals were 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 with them, they need to address the chromatic aberration issues that the lens currently suffers from. Typical optical systems correct chromatic aberration by fusing together a series of differently shaped and treated lenses, but this is no substitute for a single, flat metal one.
Metal photo of the Moon.
“We are exploring designs that are smaller and more sophisticated in the visible range, and will compensate for various optical aberrations, including chromatic aberration,” Ni says.
The team’s full research paper titled “High-efficiency, 80mm aperture metalens telescope” has been published nano letter,
Image Credits: Jeff Shea / Penn State
