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Views:6 Author:Site Editor Publish Time: 2019-09-18 Origin:Site
Naro Laser It refers to micro-nano devices that can emit laser light under the excitation of light or the excitation of a nano-material, such as nanowires, as a resonant cavity.
It refers to micro-nano devices that can emit laser light under the excitation of light or the excitation of a nano-material, such as nanowires, as a resonant cavity.
With the development of nanotechnology and nanophotonics, the application prospects of compact and miniaturized lasers have attracted attention. When the laser resonator size is reduced to the emission wavelength, more interesting physical effects will occur in the electromagnetic resonator. Therefore, it is very important to reduce the three-dimensional size of the semiconductor laser when developing ultra-fast coherent light sources with low-dimensional and low-pump thresholds, nano-photoelectric integration, and plasmonic optical paths.
With the advancement of human social science and technology, the development of the laser itself has never stopped. "Science" published the University of California, Berkeley. Huang and P. Yang et al.'s "Room Temperature Ultraviolet Radiation Nano Laser" claims to be the world's smallest laser. At that time, they first deposited gold on the sapphire substrate with a thickness of 1 to 3.5 microns, then placed them in an aluminum evaporating dish and heated the material and substrate to 880-905 degrees Celsius in argon to generate Zn vapor. The Zn vapor is transported to the substrate, and after about 2 to 10 minutes, the hexagonal nanowires can grow to 2 to 10 microns. Nanowires with a diameter of 20-150 nm naturally form a laser cavity. Nanowire samples with hexagonal section at room temperature were pumped with a fourth harmonic of a Nd:YAG laser (wavelength of 266 nm, pulse width of 3 ns). The pumped laser beam was incident on the nanowires at an angle of 10 degrees. On the axis of symmetry. In this way, the light emitted by the stimulated radiation converges on the end surface plane of the nanowire along the direction of the central sleeve of the ZnO nanowire.
The research of nano-laser has important significance for basic research and practical application. First of all, two-dimensional materials as the thinnest optical gain materials have been proven to support laser operation at low temperatures, but whether this single-layered molecular material is sufficient to support laser operation at room temperature remains doubtful in the scientific and technological community. Room temperature operation is the premise of most practical applications of lasers. Therefore, the room temperature operation of the new laser has an index significance in the history of semiconductor laser development. In addition, due to the extremely strong Coulomb interactions in two-dimensional materials, electrons and holes always appear in the exciton state, so this laser actually interacts with a new type of exciton polariton Bose-Einstein. Cohesion is closely related and is one of the most active topics in the field of basic physics.
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