Plasma Nanolaser Pointer That Generates Laser In Dark Mode
Researchers at Aalto University in Finland developed the plasma nanolaser pointer for the first time. It can work at the frequency of visible light and can use the so-called dark grid mode. The working wavelength of this laser is 1,000 times smaller than the thickness of a human hair. The lifetime of light trapping on such a small size is so short that the light only rotates up and down tens or hundreds of times at this time. This research opens up new prospects for the research of chips with coherent light sources, such as miniaturization and the application of ultrafast lasers. The laser operation in this work is based on silver nanoparticles, which are placed in a periodic array. Compared with traditional lasers where the feedback of laser signals is through ordinary mirrors, this nano-laser utilizes the radiation coupling between silver nanoparticles. These 100 nanometer-sized particles act as tiny antennas. To produce a high-intensity laser, the distance between particles is matched with the wavelength, and the radiation of all particle arrays is the same. Organic fluorescent molecules are used to provide the required laser input energy (gain). Laser in dark mode. One of the main challenges in realizing this kind of laser is that for gain, under such a small size, the light may not exist for a long enough time. Researchers have found a solution to this potential problem. The laser pointer generates laser light in dark mode.
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The dark mode can be intuitively understood by considering conventional antennas. For a single antenna, when a driving current is applied, the radiation will be very strong. If the opposite current is applied, and the location is very close to each other, the radiation of the two antennas will be very strong. small. The professor of the college explained. "The dark mode in the nanoparticle array produces a similar opposite phase current in each nanoparticle, but the frequency of visible light can now be achieved," she continued. The dark mode is attractive and requires low power consumption for this application. But without any tricks, the dark mode laser would be useless, because the light is trapped in the nanoparticle array and cannot leave," the research scientist added. "However, with the small size of the array, we found A light guide path. Pointing to the edge of the array, the nanoparticle behaves more and more like an ordinary antenna, radiating to the outside world. The research team used nanofabrication facilities and cleanroom equipment at the National Research Center to conduct the research. And the laser pointer research results have been published in "Nature Communications" magazine.
2020-08-03 12:24:29
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