Generating Lasers at Room Temperature from 310nm Particles
Scientists Create Tiniest Semiconductor Laser – 3,000 Times Smaller Than a Millimeter
Excerpts and salient points…
+ An international team of researchers led by researchers from ITMO University announced the development of the world’s most compact semiconductor laser that works in the visible range at room temperature. According to the authors of the research, the laser is a nanoparticle of only 310 nanometers in size (which is 3,000 times less than a millimeter) that can produce green coherent light at room temperature. The research article was published in ACS Nano.
As a result, the scientists succeeded in fabricating a cubic-shaped particle of 310 nanometers in size, which can generate laser radiation at room temperature when photoexcited by a femtosecond laser pulse.
+ An interdisciplinary team of researchers from St. Petersburg has chosen halide perovskite as the material for their nanolasers. A traditional laser consists of two key elements — an active medium that allows for generation of coherent stimulated emission and an optical resonator that helps to confine electromagnetic energy inside for a long time. The perovskite can provide both of these properties: a nanoparticle of a certain shape can act as both the active medium and the efficient resonator.
+ The benefit of lasers that work in the visible range is that with all other properties being equal, they are smaller than red and infrared sources with the same properties. Thing is, the volume of the small lasers generally has a cubic dependence on the emission’s wavelength, and as the wavelength of green light is three times less than that of infrared light, the limit of miniaturization is a lot greater for green lasers. This is essential for the production of ultracompact components for future optical computer systems.
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