Researchers unlock high-res view of 2D materials by doing a microscopic twist
By rapidly twisting a microscopically small tip back and forth, researchers at the University of Maryland (UMD) have unlocked a new way to detect subtle changes on the surface of a material flexing in response to infrared light.
Researchers at the University of Maryland have developed a new technique called infrared torsional force microscopy (TFM-IR) that allows for high-resolution imaging of the surface of materials as they flex and warp in response to infrared light. This method builds upon atomic force microscopy (AFM) and overcomes limitations in traditional optical microscopy by measuring both vertical and horizontal vibrations induced by light with nanometer precision.
TFM-IR works by rapidly twisting a microscopically small tip back and forth while exciting vibrations in the material with infrared light. The tip measures subtle changes in tapping frequency as the material stretches and warps, providing detailed information about the material's surface and chemical composition. The researchers tested the technique on mica, a well-understood material with chemical bonds that point in different directions, and were able to detect four vibration patterns.
By adjusting the frequency of the infrared laser pulses, they were able to distinguish between vertical and horizontal movements. This new method could potentially reveal previously unknown properties of quantum materials, which often exhibit remarkable properties at the nanoscale.
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