University at Buffalo engineers have developed a one-step, low-cost method to fabricate a polymer with extraordinary properties: When viewed from a single perspective, the polymer is rainbow-colored, reflecting many different wavelengths of light.
Used as a filter for light, this material could form the basis of handheld multispectral imaging devices that identify the "true color" of objects examined.
"Such portable technology could have applications in a wide range of fields, from home improvement, like matching paint colors, to biomedical imaging, including analyzing colors in medical images to detect disease," said UB Vice President for Research and Economic Development Alexander N. Cartwright, one of the UB researchers who led the study.
The ease of producing the polymer could make it feasible to develop small devices that connect with cell phones to conduct multispectral imaging, said Qiaoqiang Gan, a UB assistant professor of electrical engineering and another member of the research team.
"Our method is pretty low-cost, and because of this and the potential cell phone applications, we feel there is a huge market for improving clinical imaging in developing countries," Gan said.
Because the colors of the rainbow filter are produced as a result of the filter's surface geometry, and not by some kind of pigment, the colors won't fade over time. (It's the same principle that gives color to the wings of butterflies and feather of peacocks.)
Cartwright and Gan's team reported on their polymer fabrication technique online Feb. 22 in Advanced Materials, an academic journal. Coauthors on the study also include UB students Ke Liu and Huina Xu and UB research scientist Haifeng Hu. An abstract is available here: http://bit.ly/zDK42U.
Images of Gan and Cartwright are available here: http://bit.ly/zCjfYF and http://bit.ly/xIh1yt.
The UB Office of Science, Technology Transfer and Economic Outreach (STOR) has submitted a provisional patent application detailing the production process to the U.S. Patent and Trademark Office.
To create the rainbow material, Liu and Xu sandwiched a photosensitive pre-polymer syrup between two glass slides. (A photosensitive substance is one whose physical properties change upon exposure to light.)
Next, they directed a laser beam through a curved lens placed above the pre-polymer solution. The lens divided and bent the laser beam into light of continuously varying wavelengths.
As this light hit the solution, monomers in the solution began joining into polymers, forming a continuous pattern of ridge-like polymer structures. Larger ridges rose where the light struck with more intensity.
The resulting structure is a thin filter that is rainbow-colored when viewed under white light. This is because the periodic polymer layers reflect a continuous spectrum of colors, from red on one end to indigo on the other.
The single-step fabrication method -- shining a laser light through a curved lens -- is affordable and relatively simple.
The filter the researchers created was about 25 millimeters long, but the technique they used is scalable: It's possible to create filters of different sizes by shining the laser through lenses of different sizes.
Gan said the next step for the researchers is to improve the quality of the rainbow filter. The team is also beginning to explore ideas for incorporating the technology into handheld devices.
Liu presented the results of this work with the rainbow-colored polymer grating as a post-deadline paper at IEEE Photonic Annual Meeting in Arlington, Va., in October 2011. The conference is considered one of the premier international events for optics and photonics.
Charlotte Hsu | EurekAlert!
Perovskite-silicon solar cell research collaboration hits 25.2% efficiency
15.06.2018 | Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Second heat source optimises heat pump system
12.06.2018 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...
Water molecules exist in two different forms with almost identical physical properties. For the first time, researchers have succeeded in separating the two forms to show that they can exhibit different chemical reactivities. These results were reported by researchers from the University of Basel and their colleagues in Hamburg in the scientific journal Nature Communications.
From a chemical perspective, water is a molecule in which a single oxygen atom is linked to two hydrogen atoms. It is less well known that water exists in two...
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
19.06.2018 | Life Sciences
18.06.2018 | Earth Sciences
18.06.2018 | Process Engineering