US ultra-fast LED speed up 1000 times will be used for LED optical communication

Researchers at Duke University in the United States have recently developed ultra-fast LEDs that break the speed record of photons emitted by fluorescent molecules, which is 1000 times that of ordinary grades, and is an important step toward achieving ultra-fast LED and quantum cryptography. The findings were published in the October 12th issue of Nature. Photonics on the online version. This year's Nobel Prize in Physics was awarded to a scientist who invented the blue LED in the early 1990s, which promoted the development of a new generation of bright and energy-saving LED lights and color LED screens. However, the slow speed of this huge research result in switching has limited its use as a light source-based communication. In an LED, a blink of an eye is forced to emit about 10 million photons. Modern communication systems run nearly a thousand times faster than LEDs emit photons. In order to achieve LED-based optical communication, researchers must speed up photonic luminescent materials. In the new study, engineers at the university accelerated their photon emissivity to unprecedented levels by adding fluorescent molecules between the metal nanocubes and the gold film. McKenn, assistant professor of electrical and computer engineering and physics at the university. Mickelson said: One of the target applications of this research is ultra-high-speed LEDs. Although future devices may not use this precise method, they are crucial to basic physics. Mickelson is an expert in studying the interaction between electromagnetic fields and free electrons in metals. According to a report by the physicist organization network on October 13, in the experiment, his team made 75 silver nanocubes and trapped the light inside, greatly increasing the intensity of light. When a fluorescent molecule is placed next to dense light, the velocity at which the molecule emits photons is enhanced by the Purcell effect. They found that by placing fluorescent molecules between the gap between the gold film and the nanometal, their speed can be significantly improved. To achieve maximum effect, the researchers need to adjust the resonant frequency of the gap to match the colored light of the molecular response. David Co., co-author of the paper, professor of electrical and computer engineering at the university. Smith, James. With the help of Director B, computer simulations were used to accurately determine the required gap size between the nanocube and the gold film: only 20 atoms wide. The researchers said: We can choose the right size of the cube, so that the gap has nano-scale accuracy, thus a record increase in fluorescence speed of 1000 times. Because the experiment used many randomly arranged molecules, the researchers believe that they can do better. They plan to place individual fluorescent molecules precisely in a single nanocube to achieve a higher rate of photons emitted by fluorescent molecules. The researchers said: If we can set the molecules accurately, it will not only be a fast LED, but also many applications. Such as the manufacture of fast single photon sources for quantum cryptosystems, this technology will support secure communications and avoid hacking.

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