Existing methods of non-destructive imaging for nanoelectronics, such as optical and
Today ultrasound is already integrated intoatomic force microscope (AFM). AFM is a technique that allows surfaces to be scanned and mapped very accurately using a tiny needle. The advantage here is that it is not the wavelength but the size of the AFM tip that determines the resolution. Unfortunately, the frequencies used so far (1-10 MHz) are insufficient. “We do see something, but it's not clear what exactly. Therefore, the frequency of the sound used had to be further increased to the GHz range. That's what we did, ”explains Gerard Verbiest of TU Delft.
Increasing the frequency has only recently become possible.The use of photoacoustics helped. The use of the photoacoustic effect generates extremely short sound pulses. Scientists have succeeded in integrating this technique into AFM. Using the AFM tip, the scientists managed to focus the signal. The installation has already passed preliminary tests.
As mentioned, the new method especiallyinteresting for nanoelectronics. In the future, this will help to make even smaller chips with fine patterns. For example, so that you can place two layers on top of each other with nanometer precision.
There are also potential applications foroutside of electronics. For example, in cell biology to create a detailed three-dimensional image of an individual living cell. This will allow you to see how mitochondria fold in the cell. In materials science, the development will be useful for studying the process of heat transfer in graphene.
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Graphene - two-dimensional allotropic modificationcarbon formed by a layer of carbon atoms one atom thick. Carbon atoms are in sp²-hybridization and are connected via σ- and π-bonds in a hexagonal two-dimensional crystal lattice.