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However, scientists soon came across the physical limitations of light waves. Objects smaller than half of the wavelength of light could not be observed using the optical approach. This is known as the diffraction limit. To advance, science now needed a superlens that could overcome this hurdle.that can work beyond the diffraction limit. Different materials have been used in the past to make superlenses, and they work by producing a negative refractive index to produce nanometer-sized images.
In worst-case scenarios, superlenses absorb too much light and render their usage meaningless. A research team led by Alessandro Tuniz at the University of Sydney Nano Institute has found an alternate way to capture images of objects smaller than the diffraction limit by avoiding the superlens altogether.Tuniz's team approached the issue at hand by placing the light source far away from the object. This way, they could capture both high and low-resolution information coming from it.
"This produces a ‘truthful’ image of the object through the selective amplification of evanescent, or vanishing light waves," said Tuniz in the press release. "This technique is a first step in allowing high-resolution images while staying at a safe distance from the object without distorting what you see."
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