The new ultra-small laser is only one virus size

According to a report by the Physicists Organization Network on November 6 (Beijing time), a research team at Northwestern University in the United States has developed an ultra-small laser with a virus size. This laser has the characteristics of small size and can work at room temperature. It can be easily integrated into silicon-based photonic devices, all-optical circuits and nano-biosensors, and has extremely broad application prospects. Related papers were published in the "Nano Express" magazine recently published.

The size of photonics and electronic components is very important for ultra-fast data processing and ultra-high-density information storage. Therefore, miniaturization is a difficulty that must be overcome in the future development of such devices. The nanotechnology expert responsible for this research, Terry Odom, a professor of materials at the School of Arts and Sciences at Northwestern University Weinberg College and McCormick School of Engineering and Applied Sciences, said that coherent light sources at the nanoscale can not only be used to The exploration and analysis of small-scale physical and chemical phenomena can also help scientists to break the diffraction limit of light.

Odom said that the ability to manufacture this kind of nano lasers is due to a 3D bow-tie nano metal cavity structure. The geometric structure of this laser cavity can generate surface plasmons, which is an electromagnetic oscillation that excites and couples the charge density fluctuation at the interface of the metal medium. It has the characteristics of near-field enhancement, surface limitation, and short wavelength. Plays an important role in the study of science. When the surface plasmon is generated, due to the collective oscillation of the electrons on the metal surface, it can break through the threshold limit to the maximum extent, so that all photons are emitted in the form of laser without wasting any photons. The use of this bow-shaped structure has two obvious advantages over previous similar devices: First, due to its electromagnetic properties and nano-sized volume, this structure is clearly recognizable. Second, due to its discrete structure, losses can be minimized.

In addition, the researchers also found that when these structures are arranged into an array, the 3D bow-tie resonator can emit light with a specific angle according to the parameters of the lattice.

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