While using mobile device cameras, we have seen images with a halo effect. It can be seen on the images taken from any camera, and we can’t attach it to just smartphones. The halo effect is also present on SLRs, telescopes and other imaging devices. The halo effect is generated when a dark light spot is inclined toward the camera lens, and in response, it produces a ring-like effect around the light object. It happens when different wavelengths of light focus on the same point.

In other words, we can call this effect as a chromatic aberration, resulting in the purple halo effect. Well, the researchers at the Harvard have found a solution and has given a new “metacorrector” to rectify this issue.

The new processes comprise of a single layer surface of nanopillars, spaced less than a wavelength. It can be used to handle the phase, amplitude, and polarisation of the light. It is an effective way to minimize or fully eliminate the halo effect from images. It is quite cheaper and simpler method to correct chromatic aberrations.

It will help to years old correction technique to replace with new nanostructure engineering. It will help the images to be more refined and more precise without any purple halo effect. Although, it is a simple, efficient and cheaper method.

“You can imagine light as different packets being delivered at different speeds as it propagates in the nanopillars. We have designed the nanopillars so that all these packets arrive at the focal spot at the same time and with the same temporal width,” said Wei Ting Chen, a Research Associate in Applied Physics at SEAS and first author of the paper.

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Now, conventional lenses limitations won’t affect the performance, and we can go beyond boundaries. We hope in the upcoming few years, and we will see it incorporated into the new imaging systems or products.  Now, the team is further refining this new tech, so that it can be used for miniature optical devices also.

(Via)

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