The French National Research Center has successfully developed long and thin liquid optical fibers. Experts pointed out that this is an important step in the development of complex microfluidic optical functional devices and systems.
In recent years, microfluidics has developed a new research direction: microfluidic optics. It is a combination of optics and microfluidics. Light is not only an observation tool in the microfluidic device, but also directly involved in the focusing and deviation of the laser. Microfluidic devices have better application prospects in terms of scale and speed than microfluidic devices.
Microfluidic optics utilizes microfluidics and optics and optoelectronics to synthesize novel functional devices and systems. The main features are the tunability of the structure, the integration of functions, and the miniaturization of the system. Microfluidic optics will replace the work of researchers, moving liquid from one tube to another, and analyzing the resulting mixture.
If the basic component of an ordinary robot is a hand + a hoe, the main component of the microfluidic optical robot is a dynamic liquid fiber, that is, a thin liquid column formed under the action of light. It transmits the beam where it is needed. In order to reduce the effect of gravity, two liquids having different concentrations and being incapable of mixing are generally used, and the upper layer having a low concentration is in a high concentration. If the upper layer is irradiated with a laser, another liquid column will be formed in one liquid under the action of light. Unfortunately, such a liquid column cannot be held for a long time. When the height of the liquid column exceeds the circumference, the liquid column will rapidly split into different water droplets due to surface tension.
For a long time, researchers have proposed various methods for stabilizing liquid light columns, but this problem has not been solved. The most successful one is to double the height of the liquid column. Recently, French researchers announced in the recently published Journal of Physics Review that the use of a stable laser beam method enabled researchers to build liquid fibers of up to 100 beam diameters in at least a few minutes.
The researchers used a very narrow laser beam to illuminate the liquid from top to bottom. The laser beam is only a few microns in diameter and less than 1 watt in intensity. The laser beam forms a column of light with a lower concentration of liquid in a relatively high concentration liquid and propagates along the column of liquid. This long liquid column is maintained due to the pressure caused by internal total reflection.
Based on experimental observations, the researchers found some interesting phenomena: If the laser beam is sufficiently thin, the diameter of the liquid column formed is fixed, neither changing with time nor with the height of the column. If the laser beam is wide, the diameter of the liquid beam will change and begin to jump between the two values. By establishing a theoretical model, the researchers believe that for a wider laser beam, there are many equations for liquid columns of different thicknesses, which is consistent with the phenomenon that the diameter of the beam jumps from one value to another under the occasional vibration.
Experts pointed out that the research results provide great theoretical and technical support for the improvement of complex microfluidic optical devices in the future, for the future development of complex forms of liquid light columns, interaction between multi-liquid columns, and observation of liquid column performance in the horizontal direction. It is of great significance.
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