The liquid crystal elastomer is used as a mechanically adjustable, laparoscopic "rubber" laser in Dr. Peter Palffy-Muhoray's lab. PeterPalffy-Muhoray is professor of chemical physics at Kent State University and associate director of the Glenn H. Brown Institute of Liquid Crystals. The elastomer has the ability to accurately emit laser light without the use of a scope when it is stretched.

Liquid crystal elastomer (LCE), which is essentially a rubber with liquid crystal properties, can do many interesting things, especially in optics, photonics, communications and medicine. They can curl, bend, twist, wrinkle and stretch when exposed to light, heat, gases and other irritants. Because of their responsiveness, they are ideally suited for applications such as artificial muscles and blood vessels, actuators, sensors, plastic motors and drug delivery systems. They can even be used as a mechanically adjustable laparoscopic "rubber" laser.

Dr. Peter Palffy-Muhoray, a professor of chemical physics at Kent State University School of Art and Science and associate director of Glenn H. Brown Liquid Crystal Research, has worked with experts from around the world for many years on the research of liquid crystal elastomers. Recently, he and his research aide, Andrii Varanytsia, and Kenji Urayama and Hama Naga from the Kyoto Institute of Technology in Japan developed the first cholesteric liquid crystal elastomer with special properties that allows it to be used without the use of endoscopes The precise launch of the laser.

The laser consists of a laser cavity, usually formed by a fixed mirror. The light reflected between these mirrors has a characteristic frequency, just like a certain length of guitar string. The luminescent materials in the cavity amplify the light waves and emit at a precise frequency, just like pure musical notes from some instruments.

In 2001, Dr. Palffy Muhoray, Dr. Bahman Taheri and several other colleagues demonstrated for the first time that they could use liquid crystal to reflect the laser back and forth inside the material without any external endoscope. However, at that time, the laser emission frequency was not accurately controlled yet.

Their recent work, funded by the National Science Foundation and the Japan Society for the Study of Science, whose research was published in the December 4 issue of Nature titled "Adjustable Measurement of Strain in Cholesteric Liquid Crystal Elastomers Lasing ".

"We can move to applications based on what we've learned - such as remote sensors that can be accessed remotely over fiber optics and precisely tuned light sources that are very difficult to generate," said Palffy Muhoray.

The sensor can measure strain - a small change in length; or measure stress - force per unit area.

"In principle, it can also be placed in a shoe to measure the shear stress of diabetic foot and can be accessed through the fiber; sending an optical pulse into the fiber, the color of the return light emitted by the laser carries information about the strain "Said Palffy Muhoray." Likewise, remote devices can also be monitored using fiber optics to measure pressure, strain, temperature, and chemical presence.

LCD at the same time as the distribution of the main cavity and the active medium. A simple optical pumping of such a sample results in a low threshold lamellar lasing at the edge of the band. Liquid crystal elastomers can change their shape when the order of orientation of their constituents changes - for example by changing the temperature, applying a field or introducing impurities.

"We're going to continue our work in this area to develop new tunable laser materials," said Palffy Muhoray. "Today, scientists are mainly pursuing better understanding of the interaction between light and matter and engineers planning future devices. Benefit from our findings.However, tomorrow, larger societies are likely to benefit from this as well.LCD research was largely driven by scientific curiosity until 1970. The twisted state of the liquid crystal found at Kent State University The invention of nematic effect and liquid crystal display has changed the display technology for the benefit of all mankind. "

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