Blocking small holes in the metal plate can block light from passing through it, but at the nanometer scale, this common sense is no longer valid. According to a report recently organized by the American Physicists Organization Network, engineers at Princeton University in the US have found that if a small hole on a nano-metal film is covered with a cover, not only light is blocked, but the amount of transmitted light is increased. This finding is found in optics. The field of instrumentation and ultra-sensitive detection has broad application prospects. Related papers were published in the recently published Optical Express magazine.

The study was led by Stephen Chou, professor of electromechanical engineering at Princeton University. In one experiment, he and his colleagues used a 40-nm-thick gold film with a 60-nanometer-diameter array of microholes spaced 200 nanometers apart. Each micro-hole is covered with a small gold plate, which is 40% larger than the micro-hole, with only a slight gap between the surface of the metal film and the disk. They first irradiated the laser from underneath the film and examined the light passing through it. It was found that 70% more light was transmitted than without the lid. From the top and bottom, the result is the same.

“We thought that the golden plate could block all the light and did not expect more light to pass through.” Zhou explained, “The golden plate seems to have become an 'antenna' that can capture and radiate electromagnetic waves. It captures small holes. The light from one side radiates from the other side, and the light waves pass through the metal surface and go through the lid and increase greatly.When the laser encounters the molecule, it produces a weak signal, and the metal film and the metal disk with the micro-hole array will make the signal weak. Enhanced, more sensitive when identifying substances."

Zhou also pointed out that this result may bring huge impact and application value. The first is light shielding. In very sensitive optical instruments such as microscopes, telescopes, spectrometers, and other detectors, if you want to shave the glass with a metal film, the result may be counter-productive. If researchers want to block all light transmissions, they need to rethink their technologies. For example, in photolithographic printing, light will form a template on the metal film of the glass plate to form a template, directing the light to pass through certain positions and blocking other places. However, due to the light transmission effect of this sealing hole, engineers must check the mold again. Whether to achieve the desired shading effect.

Second, this new technology can increase light permeability. For example, in a near-infrared microscope, letting light through micropores a few billionths of a meter in diameter increases the amount of transmitted light, which increases the amount of information on the observation target, and researchers can see more subtle detail. (Chang Lijun)

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