France has successfully developed an ultra-long liquid optical fiber.
Time:
May 04,2023
The French National Centre for Scientific Research has successfully developed a long, thin liquid optical fiber. Experts point out that this represents an important step forward in the development of sophisticated microfluidic optical devices and systems.
The French National Centre for Scientific Research has successfully developed a long, thin liquid optical fiber. Experts point out that this represents an important step forward in the development of sophisticated microfluidic optical devices and systems.
In recent years, a brand-new research direction has emerged in microfluidics: microfluidic optics. This field represents the integration of optics and microfluidics. In microfluidic devices, light not only serves as an observational tool but can also directly participate in the focusing and steering of laser beams. Microfluidic optical devices hold greater application potential than conventional microfluidic devices in terms of both scale and speed.
Microfluidic optics leverages microfluidics, optics, and optoelectronics technologies to fabricate novel functional devices and systems. Its key features include tunable structural design, integrated functionality, and miniaturized system architectures. Microfluidic optical devices will be able to take over the tasks currently performed by researchers—transferring liquids from one test tube to another and enabling analysis of the resulting mixtures.
If we say that the basic components of a conventional robot are “a hand plus a hammer,” then the key component of a microfluidic optomechanical robot is the dynamic liquid optical fiber—a thin, liquid column formed under the influence of light. This fiber can transmit light beams precisely to the desired location. To minimize the effects of gravity, two liquids of different concentrations—non-mixing and immiscible—are typically used, with the lower-concentration liquid floating above the higher-concentration one. If a laser beam is directed at the upper layer, an additional liquid column will spontaneously form within the original liquid under the influence of light. Unfortunately, however, such liquid columns cannot last very long. Once the height of the liquid column exceeds its circumference, surface tension will cause it to rapidly break apart into separate droplets.
For a long time, researchers have proposed various methods for stabilizing liquid light columns, yet this problem has remained unsolved—indeed, the most successful attempt so far has only managed to double the height of the liquid column. Recently, French researchers announced in the newly published journal Physical Review Letters that, by employing a stable laser beam, they have successfully created liquid optical fibers with lengths reaching up to 100 times the diameter of the original light column—in just a few minutes.
Researchers directed an extremely narrow laser beam downward onto a liquid. The diameter of the laser beam was only a few micrometers, and its intensity was less than one watt. In liquids with relatively high concentrations, the laser beam created a column of lower-concentration liquid that propagated along the length of this liquid column. Thanks to the pressure generated by total internal reflection, this long liquid column remained stable.
Based on experimental observations, the researchers discovered some intriguing phenomena: If the laser beam is sufficiently narrow, the diameter of the resulting liquid column remains constant—neither changing over time nor varying with the height of the column. However, if the laser beam is wider, the diameter of the liquid column will fluctuate and begin to exhibit a jumping behavior between two distinct values. By developing a theoretical model, the researchers concluded that for wider laser beams, there exist multiple solutions to the governing equations, each corresponding to liquid columns of different thicknesses. This finding aligns with the observed phenomenon in which the diameter of the liquid column randomly jumps from one value to another under the influence of stochastic fluctuations.
Relevant experts pointed out that this research achievement provides substantial theoretical and technical support for future improvements in complex microfluidic optical devices. It is of great significance for the development of complex liquid light columns, the study of interactions among multiple liquid light columns, and the observation of the lateral behavior of liquid light columns.
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