Liquid crystals could help deflect laser pointer attacks on aircraft

March 31, 2019

ORLANDO, Fla., March 31, 2019 -- Aiming a laser beam at an aircraft isn't a harmless prank: The sudden flash of bright light can incapacitate the pilot, risking the lives of passengers and crew. But because attacks can happen with different colored lasers, such as red, green or even blue, scientists have had a difficult time developing a single method to impede all wavelengths of laser light. Today, researchers report liquid crystals that could someday be incorporated into aircraft windshields to block any color of bright, focused light.

The researchers will present their results today at the American Chemical Society (ACS) Spring 2019 National Meeting & Exposition. ACS, the world's largest scientific society, is holding the meeting here through Thursday. It features nearly 13,000 presentations on a wide range of science topics.

According to the Federal Aviation Administration, 6,754 laser strikes on aircraft were reported in 2017. "We were approached by collaborators in the aviation department at our university about the growing problem happening at airports across the world, where people were shooting lasers at planes during takeoff and landing, the critical phases of flight," says Jason Keleher, Ph.D., the project's principal investigator. Such attacks, which cause bright flashes of light in the cockpit, can distract pilots or inflict temporary or permanent visual damage, depending on the wavelength and intensity of the laser.

"We wanted to come up with a solution that didn't require us to completely re-engineer an aircraft's windshield, but instead adds a layer to the glass that harnesses the existing power system for windshield defrosting," says Daniel Maurer, an undergraduate student. Keleher and Maurer are at Lewis University.

Rather than being integrated into the windshield, previous approaches have included pull-down windscreens or goggles that pilots don during takeoff and landing. However, these can be inconvenient because they require the flight crew to take these precautions whether or not they are actually being targeted. An even bigger problem is that these strategies work only for specific wavelengths of laser light. "They don't block everything," Maurer says. "They're usually targeted toward green lasers because those are used for the majority of the attacks."

To develop their new approach, the researchers took advantage of liquid crystals -- materials with properties between those of liquids and solid crystals that make them useful in electronic displays. The team placed a solution of liquid crystals called N-(4-methoxybenzylidene)-4-butylaniline (MBBA) between two 1-inch-square panes of glass. MBBA has a transparent liquid phase and an opaque crystalline phase that scatters light. By applying a voltage to the apparatus, the researchers caused the crystals to align with the electrical field and undergo a phase change to the more solid crystalline state.

The aligned crystals blocked up to 95 percent of red, blue and green beams, through a combination of light scattering, absorption of the laser's energy and cross-polarization. The liquid crystals could block lasers of different powers, simulating various distances of illumination, as well as light shone at different angles onto the glass.

In addition, the system was fully automatic: A photoresistor detected laser light and then triggered the power system to apply the voltage. When the beam was removed, the system turned off the power, and the liquid crystals returned to their transparent, liquid state. "We only want to block the spot where the laser is hitting the windshield and then have it quickly go back to normal after the laser is gone," Keleher notes. The rest of the windshield, which was not hit by the laser, would remain transparent at all times.

Now that the researchers have shown that their approach works, they plan to scale it up from 1-inch squares to the size of an entire aircraft windshield. Initial results have shown that a sensor grid pattern on 2-inch squares of glass will respond only to the section of glass that is illuminated. The team is also testing different types of liquid crystals to find even more efficient and versatile ones that return to the transparent state more quickly once the laser is removed.
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A press conference on this topic will be held Monday, April 1, at 1:30 p.m. Eastern time in the Orange County Convention Center. Reporters may check-in at the press center, Room W231B, or watch live on YouTube http://bit.ly/ACSLive_Orlando2019 ("ACSLive_Orlando2019" is case-sensitive). To ask questions online, sign in with a Google account.

The researchers acknowledge support and funding from Southwest Airlines, the Aviation and Transportation Department at Lewis University and the Colonel Stephen S. and Lyla Doherty Center for Aviation and Health Research.

The American Chemical Society, the world's largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.

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Title

Analyzing molecular structure of liquid crystals to develop wavelength independent films to mitigate laser attacks on aircraft

Abstract

Laser attacks on aircraft have become a prevalent occurrence over recent years, and present significant challenges to pilots of commercial, military and private aircraft during critical stages of flight. These attacks are seen as a distraction, cause flash blindness, or result in permanent eye damage, endangering the lives of the pilot and crew. Previous work has shown to provide incomplete performance as wavelength dependencies limit the effectiveness of the system. In an effort to move past a wavelength dependent solution, this work focused on taking advantage of the polarization and absorbance properties of liquid crystal (LC) technologies to block intruding laser light. In the creation of a cell, the surface of Indium tin oxide was prepared via controlled polishing, influencing the LC to align in a planar orientation when applied voltage creates an electric field within the cell. As laser light permeates the LC, its power is reduced via the following dissipation pathways; absorption of the laser's energy, scattering of the laser light when in crystal phase, and an interaction with linearly polarized light. If polarization of the laser and LC are parallel, the LC relies on the ability to reflect light in crystal phase. If these polarizations are perpendicular, roughly 90% of the lasers power is blocked regardless of wavelength. The only observable wavelength dependencies are more efficient blocking against wavelengths the respective LC absorbs. This study seeks to analyze how blocking efficiency is impacted by the molecular structure of varying LC's.

American Chemical Society

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