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London: Using new nanotechnology, researchers have reproduced a colour image of Mona Lisa which is less than one pixel on an iPhone Retina display – 50 micrometres long or about 10,000 times smaller than the real Mona Lisa in the Louvre Museum in Paris.

The breakthrough revolutionises laser printing technology, allowing people to print high-resolution data and colour images of unprecedented quality and microscopic dimensions.


The new laser technology allows printing in a mind-blowing resolution of 127,000 dots per inch (DPI). In comparison, weekly or monthly magazines are normally printed in a resolution equivalent to 300 DPI.

The team from Technical University of Denmark (DTU) believe that there is considerable scope for application of the new laser printing technology.

“It will be possible to save data invisible to the naked eye. This includes serial numbers or bar codes of products and other information. The technology can also be used to combat fraud and forgery as it will be easier to determine whether the product is an original or a copy, ” explained professor Anders Kristensen from DTU Nanotech.

Printing the microscopic images requires a special nanoscale-structured surface.

The structure consists of rows with small columns with a diameter of merely 100 nanometers each.

This structured surface is then covered by 20 nanometers of aluminium.

When a laser pulse is transmitted from nanocolumn to nanocolumn, the nanocolumn is heated locally, after which it melts and is deformed.

The temperature can reach up to 1,500 degrees Celcius but only for a few nanoseconds, preventing the extreme heat from spreading.

Strong laser pulses create a drastic deformation, which gives the reflection from the nanocolumn an orange and yellow colour tone.

The new laser printing technology can also be used on a larger scale to personify products such as mobile phones with unique decorations, names, etc.

Foreign companies producing parts for cars, such as instrument panels and buttons, are already taking a keen interest in the technology as it can simplify the production.

The breakthrough in nanotechnology was detailed in the journal Nature Nanotechnology. (IANS) (image courtesy: animalnewyork.com)


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Indian wrestler Ravi Kumar (57kg) and Deepak Punia (86kg) enjoyed fruitful outings at the Tokyo Olympic Games as they secured semifinal berths in their respective weight categories at the Makuhari Messe on Wednesday.

On the opening day of the wrestling competition, Ravi Kumar defeated Bulgaria's Georgi Vangelov 14-4 on technical superiority to reach the last-four in the men's 57kg category, while compatriot Deepak Punia overcame China's Zushen Lin 6-3 on points to advance to the semifinals.

Ravi Kumar will take on Nurislam Sanayev of Kazakhstan in the last-four, while Punia will be up against David Morris Taylor of the USA.

Earlier, Ravi Kumar had won his opening-round bout by technical superiority against Colombia's Oscar Tigreros to secure a quarterfinal spot. Competing in the Round-of-16 bout against the Colombian wrestler, the 23-year-old Ravi Kumar, who is making his Olympic debut, showed no nerves as he dominated the bout to win by technical superiority (13-2).

Ravi Kumar landed attack after attack and went 13-2 up, winning the bout by technical superiority with minutes to spare. In wrestling, building up a 10-point lead over the opponent results in a victory by technical superiority.

India's 86kg freestyle wrestler Deepak Punia showed no signs of the niggle that had forced him to pull out of the Poland Open Ranking Series in Warsaw in June, as he defeated Nigeria's Ekerekeme Agiomor on technical superiority to secure a quarterfinal berth.

He got his Olympic campaign to a fine start as he was in control from the start of the bout and hardly ever allowed his Nigerian opponent any room to maneuver his moves, finally winning with a 12-1 on technical superiority.

Punia, who had also suffered an elbow injury just before the Games, was slow at the start but came into his own as the bout progressed, inflicting takedowns at regular intervals to earn points.

The Indian wrestler eased into a 4-1 lead at the break and extended his lead comfortably in the second period.

Punia, the silver medallist from the 2019 world wrestling championships, then set up a clash with China's Lin Zushen in the quarterfinals and defeated him 6-3.

(IANS/HP)