…“We have now developed a practical way to implement superlensing without a super lens,” said Dr. Alessandro Tuniz from the School of Physics and University of Sydney Nano Institute and the study’s lead author, in a press release announcing the achievement.
To accomplish this feat, the researchers placed their light probe a distance from the sample they wanted to image and collected high-resolution and low-resolution information. According to the release, the probe gathered light “at terahertz frequency at millimetre wavelength, in the region of the spectrum between visible and microwave.”
Next, that information is entered into a computer and run through processes that effectively “select” the most valuable light and remove the unwanted light. The result is an image that peers through the seemingly unbreakable diffraction limit by a factor of four times, something previous efforts have failed to get past.
“We overcome this (diffraction limit) by performing the superlens operation as a post-processing step on a computer, after the measurement itself,” Tuniz explained. “This produces a ‘truthful’ image of the object through the selective amplification of evanescent, or vanishing, light waves.”
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