Light-Speed Advances: Graphene Nanoprocessing With a Femtosecond Laser — Researchers at Tohoku Univ |
Illustration of a graphene film being hole-drilled by laser irradiation. The size of the carbon atoms is exaggerated and differs from the actual size. Credit: Yuuki Uesugi et al.graphene
But to render these devices into practical application, it’s crucial to have efficient processing techniques that can structure graphene films at micrometer and nanometer scale. Typically, micro/material processing and device manufacturing employ nanolithography and focused ion beam methods. However, these have posed longstanding challenges for laboratory researchers due to their need for large-scale equipment, lengthy manufacturing times, and complex operations.
“With proper control of the input energy and number of laser shots, we were able to execute precise machining and create holes with diameters ranging from 70 nanometers – much smaller than the laser wavelength of 520 nanometers – to over 1 millimeter,” says Yuuki Uesugi, assistant professor at Tohoku University’s Institute of Multidisciplinary Research for Advanced Materials, and co-author of the paper.
Atomic defects in graphene are both detrimental and advantageous, depending on the application. Whilst defects sometimes downgrade certain properties, they also introduce new functionalities or enhance specific characteristics.
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