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Scientists develop first liquid nanolaser

28 April 2015, 12:34

   Researchers at Northwestern University have developed the first liquid nanolaser.
   The apparatus is configured in real-time, i.e., scientists can quickly and easily produce various colors beam.
This laser technology, according to the inventors, is very useful in practical applications, including the "lab on a chip" in medical diagnosis.
To understand this concept, imagine a laser pointer, the color of which can only be changed by changing the liquid inside it. In addition to a color change in real time, the liquid nanolaser has additional advantages over other Nanolasers: simple and inexpensive to manufacture and operates at room temperature.
    Nanoscopic lasers, first demonstrated in 2009, there are now only in research laboratories.
    However, they are of great interest for technology and military units.
    Lead researcher Teri W. Odom said: "Our research allows us to think about the new laser designs and the opportunities they offer."
Odom said liquid nanolaser in this study, no laser pointer, a laser device on a chip. Laser color can be changed in real time, when the liquid dye microfluidic channels above the laser cavity varies.
   Laser cavity consists of an array of reflective gold nanoparticles, where the light is concentrated around each nanoparticle, and then amplified.
   The main advantages of very small lasers:
• They can be used for optoelectronic integrated circuits;
• They can be used in an optical information recording and lithography;
   They can operate reliably at a single wavelength and can operate much faster than conventional lasers as made of metal.
The research group has found a way to integrate Odom liquid materials to enhance array of gold nanoparticles to achieve nanoplazmonnoy generation that can be dynamically adjusted reversibly and in real time. Organic dye molecules are readily soluble in solvents with different refractive indices.
   Thus, the dielectric medium surrounding the nanoparticle array may be tuned. These nanoscale lasers nanocavity fixed structure may be different lasing wavelengths, which can be configured by 50 nm from 860 to 910 nm, the change of the dye.

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